Riding'times Z8 Pro Review 2026: $899, 1,497.6 Wh

Riding Times Z8 Pro · moped-style fat-tire e-bike with pedals · $899 · 750 W rated, 1,500 W peak rear hub motor · 80 N·m · two 48 V 15.6 Ah packs, 1,497.6 Wh · 112 lb with both packs · max load 330 lb on the product page, 220 lb in its record · Limited Mode 15.5 mph, Unlimited Mode throttle to 31 mph · rider height 4'3" to 5'11" · verified September 26, 2026

Quick Answer — For $899, the Riding'times Z8 Pro pairs a 750 W rated, 1,500 W peak rear hub motor with two removable packs, 1,497.6 Wh in all, on a moped-style frame with pedals, fat tires and suspension at both ends. At 15.5 mph on the throttle, a full charge carries a 180 lb rider about 77 miles over level pavement.

With easy pedaling (75 W) at that pace the charge reaches about 118 miles, and at 20 mph on the throttle it drops to about 56. Riding'times prints 50 to 74 miles on the throttle and 100 to 120 with pedal assist, and the range section turns each of its figures into a ride you can check.

Its Limited Mode holds every level to 15.5 mph and its Unlimited Mode lets the throttle reach 31 mph (Riding'times' FAQ); the class section reads each mode against the federal and California texts.

What this review covers

What $899 buys · What it is · Z8 Pro or GT33 · Your fit · Motor and modes · The two packs · Range · Brakes and display · Suspension and tires · Weight and load · The Mercer fit test · UL · Recalls · The class question · Where to ride · Green and red flags · The verdict · Checklist · Buying from us · FAQ · Limitations · The bottom line · References

How we verified this Riding Times Z8 Pro review

On September 26, 2026 we read Riding'times' Z8 Pro product page, its product record, its catalog, the FAQ, the warranty page, the Z8 owner's manual, its posts on the Z8 series, our own listing and the statutes quoted in the class section. The range and fit figures are our own computation, and each of those sections ends with its formula and the source of every input.

This is a specification-verified review: every figure was checked against what Riding'times publishes and recomputed, and the range model reproduces the road-cycling benchmark it is built on. We sell the Z8 Pro, so read the red flags as closely as the green.

Written by Milad Ghobadibeygvand, BScN (Western University, 2014). Corrections: support@redtailebikes.com.

What $899 buys

Read September 26, 2026 from the Z8 Pro product page (its headline strip, feature panels, Z8 vs. Z8 Pro comparison table, geometry list and FAQ), its product record, the FAQ, the Z8 owner's manual and Riding'times' post of July 17, 2026. A row with two figures gives both because two of its documents disagree; the limitations list every pair.

The Riding Times Z8 Pro: a moped-style fat-tire e-bike with pedals

Riding'times sells the Z8 Pro on its product page as an everyday machine: "From daily commutes to weekend adventures, the Z8 Pro is built to handle more of your everyday life." The same page lists "city streets, bike paths, light trails, and casual cruising" as its ground.

Two packs are the reason to pick the Pro. One battery sits in the middle of the frame under the top tube, and the second hangs on the down tube, each 48 V and 15.6 Ah, and the page's battery panel says you can "Easily remove the battery for convenient charging".

The manual's parts diagram numbers them "11. Battery" and "28. Battery" and labels the case on the top tube "29. Beg"; the July 17, 2026 post lists a "Front storage bag included".

From Riding'times' studio image: the case on the top tube, the flat pack in the middle of the frame with its red switch, and the second pack, with its key lock, on the down tube.

The manual's Z8 Pro diagram: "29. Beg" on the top tube, "11. Battery" in the middle of the frame, "28. Battery" on the down tube, and the throttle, shifter and three-in-one switch on the bar below.

Pedals and gears are part of the package. Riding'times' FAQ groups the "Z8, Z8 Pro, GT73, and GT73 Pro" together: "These models are equipped with pedals and are designed for eBike-style operation." Its July 17, 2026 post calls the Z8 Pro "the current version with dual batteries, Shimano 7-speed gears, and everything that made earlier Z8 builds popular, now with stronger specs for 2026."

The page's own FAQ draws its limits too: the Z8 Pro "is designed primarily for commuting, cruising, and recreational riding rather than stunt riding."

Z8, Z8 S or Z8 Pro?

Riding'times built three Z8 models, and its product record still sets them side by side:

The body of Riding'times' product record for this listing, read September 26, 2026. The product page's own Z8 vs. Z8 Pro table gives the Z8 50 to 59 miles with pedal assist, and the manual gives the Z8 S a 48V 20.4Ah pack.

Today the Pro is the one Z8 that Riding'times sells. On September 26, 2026 its catalog feed held 132 items, the whole catalog, and one Z8 bicycle among them: the Z8 Pro, marked unavailable. The Z8 and Z8 S appeared only in parts listings, such as a "Complete Quick-Release Axle Set for Riding'times Z8 / Z8S".

Z8 Pro or GT33?

Riding'times' July 17, 2026 post compares its two $899 machines, and describes the Z8 Pro as "lighter, more agile, and built for riders who want moped-style handling on city streets." With the Pro sold out at the maker, the GT33 is the one of the pair Riding'times had in stock that day.

Each machine's product page, record and FAQ, and our two listings, read September 26, 2026. The computed row is this site's range model run on each machine's published figures; our GT33 review prices its range the same way.

Will the Z8 Pro fit you?

Riding'times' photographs show the Z8 Pro's seat mounted on the frame's rails, and its top edge stands 33.0 inches off the ground at its lowest point: seated there, 12 of 100 riders at 5'6", 38 of 100 at 5'8" and 80 of 100 at 5'10" can put both feet flat, and every surveyed rider from 6'2" up can.

Those shares come from 6,068 bodies in the US Army's 2012 anthropometric survey, measured against Riding'times' printed geometry and its drive-side studio image of the Z8 Pro. A bike with pedals and a fixed seat asks three things of your body: whether your feet reach the ground at a stop, how bent your knee stays at the bottom of each stroke, and how you hold the bars.

Take three measurements before you read the tables:

1. Your inseam: stand in socks against a wall, pull a hardcover book up firmly between your legs, and measure from the floor to its spine.
2. Your height, to find your row in the foot-down table, which works at the seat's photographed 33.0 inches.
3. How you plan to ride: if you mean to pedal hard for long stretches, start with the pedaling table.

Riding'times gives the Z8 one rider window in its FAQ, "Recommended Rider Height: 130 cm – 180 cm", which is 4'3" to 5'11", with "Recommended Age: 10 years and above". The rows below print the model beside that window. The survey holds too few bodies under 4'11" to give a row, so a rider below that height goes by the three measurements above.

The geometry drawing on the Z8 Pro's product page, with the nine numbered dimensions its list prints: rear rack height 32.7 in, front and rear center lengths, a 41.3-inch wheelbase, 6.7 inches of front travel, front section height 31.5 in, overall height 43.3 in, pedal clearance 4.7 in and overall length 63.8 in.

Will I pedal with a bent knee?

Yes, for nearly every rider: the seat sits 2.6 inches below the pedaling formula's height for the median rider at 5'0" and 10.7 inches below it at 6'2", and from 5'2" up it suits fewer than 1 rider in 100 at each height the table prints.

The formula puts the saddle 109% of your inseam above the pedal axle at the bottom of the stroke (Peveler et al., 2005), and the recommendations published in Ferrer-Roca et al., 2012 span 106% to 110.4%.

For each height: the floor-to-saddle height the 109% formula asks of the median rider, how far the Z8 Pro's seat, 33.0 inches on Riding'times' photograph, sits under it, and how many riders of 100 have the seat inside their 106 to 110.4% band. Typical inseam spans the survey's 5th to 95th percentile crotch height at that height.

A seat this far under the formula leaves the knee well bent at the bottom of every stroke. The Z8 Pro answers with its throttle and its assist levels, and the effort table shows what a light, easy pedal adds to the miles.

Can I put a foot down at a stop?

At the photographed 33.0 inches, 3 of 100 riders at 5'5", 38 of 100 at 5'8" and 94 of 100 at 5'11" can put both feet flat seated. Shorter riders stop with one foot down and the bike tipped slightly toward it, and the table shows how far short the seat leaves them.

The table works from Riding'times' drive-side studio image, scaled at the published 41.3-inch wheelbase: the top edge of the main seat dips to 33.0 inches near its front, where you sit.

The middle column is the median barefoot inseam at each height; the clearance is the barefoot inseam of the rider at that height's 5th percentile minus the seat's 33.0 inches, so a minus sign is how far the seat stands above the shorter-legged rider. A boot's sole adds to your inseam.

Will I feel cramped, or stretched?

Upright for nearly everyone: the grips stand 14.8 to 15.7 inches ahead of the crank axle and 34.2 to 34.8 inches above it, so 85 of 100 riders at 5'4" and every surveyed rider from 5'10" up reach them sitting straight. The median rider leans at all only at the shortest height, 1 degree at 5'0".

The taller you are, the more your arms fold to hold grips this close: from 5'10" up, where every surveyed rider sits upright, the median rider's elbows bend 52 degrees at 5'10" and 59 at 6'2".

Each figure is worked from the median body's own measured torso and arms, with the grips measured on Riding'times' studio image. Lean is the trunk's tilt from vertical at which straight arms reach the grips, for the median rider seated at the seat's lowest point; the range runs across the seat's flat and the grip's length.

How much weight goes through my wrists?

About 5 percent of your body weight at the median with the back relaxed, at every height; the shortest riders carry up to 11 percent sitting at the back of the seat's flat. Ten road racers on the brake hoods in a laboratory put 15% of their weight on the bars (Carahalios, 2015), about three times this figure.

With about 5 percent of your weight on them, an upright rider's hands mostly steer, and upright is the Z8 Pro's position for nearly everyone. Riding'times' FAQ says "Always wear a helmet and follow applicable traffic laws when riding."

The most the hands carry with the back relaxed, from each body's segment weights (Clauser et al., 1969); the bracket runs across the seat's flat and the grip's length, and the pounds use the survey's median weight at each height.

How do I set it up when it arrives?

Nothing on the seat moves, so setup is the assembly, the handlebar clamp and a recheck. The page's FAQ says the bike "arrives approximately 85% pre-assembled", and the manual walks through the rest: the handlebar into the stem "fasten the screws by using NO.4 Allen Wrench", the front wheel on its quick release, the headlight, the cables "based on the color", the front mudguard, and the pedals, "L" on the left and "R" on the right.

The manual asks for one check before every ride: "Check the operation of the brake motor cutoff before each ride." Recheck the handlebar clamp, the pedals and the axles after the first few rides.

How we computed fit

The formula saddle sits 1.09 × your inseam above the pedal axle; the foot-down figure is your inseam less the seat's height; lean is the least trunk tilt at which straight arms reach the grips, and elbow bend the angle an upright rider's arms fold to hold them; hand load is the weight of head, trunk and arms times the lean, over the reach.

Take a 5'8" rider with the survey's median 32.6-inch inseam: the formula wants the saddle 40.1 inches off the ground, 7.1 inches above the Z8 Pro's 33.0-inch seat, and the inseam falls 0.4 inch short of the seat.

Before anything was measured on the image, its scale was set by the published wheelbase and checked against Riding'times' other printed dimensions.

Scaled axle to axle at the published 41.3-inch wheelbase on Riding'times' drive-side image of the Z8 Pro. The overall length and both center lengths land within 3.5 percent. The list prints 19.7 inches as the front center and 21.7 as the rear, while its own drawing draws the front-center line as the longer of the two, so each figure is held against the length the drawing gives it.

The height reads 9.3 percent over the list, measured to the top of the grip's end cap, and the pedal clearance 7.7 percent over, measured to the pedal axle, which sits above the pedal's underside.

A 750 W rated, 1,500 W peak hub motor and two speed modes

Riding'times words the Z8 Pro's motor several ways, and the rated figure is the one to hold onto. Its catalog card lists "750W (Nominal)"; the comparison table and the record give "Rear Gear Hub Motor 750W(Peak 1500W, Torque 80Nm)"; the page's FAQ says "750W rated rear hub motor with up to 1500W peak output and 80 Nm of torque".

Its pulling-power panel calls it a "750W peak integrated geared hub motor", and the headline strip prints "1500W Brushless Hub Motor". The class section reads the rated 750 W against each statute, and the range model holds the motor's draw to what the controller's printed 48 V and 21 A allow.

The rear hub motor, the freewheel's cogs and a derailleur marked Tourney, in a detail image from the Z8 Pro's product page.

The reduction sits inside the hub. The panel describes "a fixed 5.2:1 internal reduction system to turn motor speed into stronger wheel-driving force", and adds that "The reduction gears are protected inside the rear hub, so motor power reaches the wheel without relying on the ebike's chain and cassette." The chain carries your pedaling; the motor turns the wheel on its own.

Riding'times' FAQ gives the Z8 and Z8 Pro two modes:

Riding'times' FAQ, "What is the speed for each model?", Z8 / Z8 Pro, read September 26, 2026: "Note: These speeds are fixed in the software and cannot be changed." Its Limited Mode answer adds: "When Limited Mode is enabled, the maximum speed of the eBike is capped at 25 km/h (15.5 mph) regardless of the selected pedal-assist or throttle level."

The page's own FAQ answers the parent's version of the question, "Can I limit the Z8 Pro's top speed for a younger rider?": "Yes. The Z8 Pro supports adjustable speed settings and can be configured with a maximum speed limit of approximately 25 km/h (15.5 mph)."

It asks buyers to "contact the Riding'times support team before or after purchase" to confirm the procedure for their bike, and so do we: ask, and we will get Riding'times' answer for yours in writing.

The gears are for your legs. The July 17 post lists "Shimano 7-speed", the Z8 Pro's detail image shows a derailleur marked Tourney, and the manual labels the shifter "Variable speed dial"; the motor's help comes from the assist level you choose, 0 to 5 on the display, and reaches the wheel through the hub's own reduction.

Two 48 V 15.6 Ah packs, 1,497.6 Wh

Two packs of 48 V and 15.6 Ah hold 1,497.6 watt-hours between them, which the catalog card rounds to "1500Wh". The battery panel says "The dual 48V 15.6Ah removable batteries offer a range of 50-80 miles with the throttle and 100-120 miles with pedal assist", and that you can "use the built-in USB interface as a portable power source during your travels."

The comparison table lists two chargers, "48V 2A x2", and "7-9H" to charge; the arithmetic agrees, since 15.6 Ah at 2 A is 7.8 hours from empty, and with both chargers running both packs fill in that time. The August 2026 parts list in the manuals section counts the chargers as "2PCS".

The manual describes charging a pack off the bike: "open the key and take out the battery", plug the charger into the wall and then into the pack, and "When the red light is on, it will be charged for 7-9 hours, and when the green light is on, it will be full." It adds two warnings worth taping inside the garage door:

• "When installing the battery, any water or ice on the battery connector can cause the battery to burn out."
• "The key is used to remove the battery, inserting the key into the charging port can also cause the battery to burn out."

For storage, the manual says to keep the pack "at room temperature, charged to about 40% to 60% of capacity", and Riding'times' FAQ asks that "The battery power switch is turned OFF" before charging.

How far the Z8 Pro goes on one charge

On level pavement a 180 lb rider on the throttle gets about 77 miles from a full charge at 15.5 mph, the Limited Mode cap, 56 at 20 mph and 49 at 22 mph. Add easy pedaling, 75 watts from your legs, and the 15.5 mph ride stretches to about 118 miles.

Price your own ride in three steps:

1. Find your pace in the speed table, then add any pedaling from the effort table.
2. For each 1,000 feet you climb, hold back 231 to 264 Wh of the 1,497.6 (10 mph on the throttle, 4 to 6% grades; the hills table).
3. Adjust for your load and the weather, then plan on three quarters of what is left.

Each table prices one steady ride from Riding'times' specification, Bafang's published figures for a comparable geared hub motor, drum measurements of fat tires, the wheel measured on Riding'times' studio image and a cycling-power model validated on an open road. The formula subsection works one ride through from the wheel back to the pack.

Does riding faster cut range? Miles at each speed

Yes, and fast: a full charge on the throttle lasts about 110 miles at 10 mph and 40 at 25. From 15.5 to 20 mph alone the ride falls from 77 miles to 56, because the power the air takes grows with the cube of your speed.

A 180 lb rider holding each speed on the throttle across level pavement in 77 °F air. The last column leaves a quarter of the 1,497.6 Wh unused, the margin a measured pedelec kept in reserve in Schmitt, Decker and Doppelbauer's test-bench study. With that rider the comparable 750 W motor runs out of speed near 25.9 mph on the flat, so the rows end at 25 mph.

How much does pedaling add? Range by effort and speed mode

A lot, because the motor only makes up what your legs do not: 75 watts of easy pedaling takes the 77-mile ride at 15.5 mph to about 118 miles, and 150 watts to about 227. At higher speeds the air takes most of the power and the gain shrinks.

Full-charge miles for a 180 lb rider at a steady speed on level pavement. Easy pedaling is 75 W at the pedals and steady pedaling 150 W, which reaches the wheel through the chain at 97.7% (Martin et al., 1998).

The same trade in watt-hours for each mile, on the flat and on a climb:

Battery watt-hours per mile, 180 lb rider. A dash marks a ride that would need more power from the pack than the 1,008 W the controller's printed 48 V and 21 A allow, the ceiling the model puts on the motor's draw: at 12 mph up an 8% grade that holds even with 150 W from the rider.

On pedal power alone, with the motor off, the same rider holds about 8.5 mph on 75 W and 12.7 mph on 150 W across level ground.

Each mode's cap sets the fastest steady pace, and so the range at that pace:

Level pavement and a 180 lb rider, each mode held at the cap in Riding'times' FAQ. The Unlimited Mode cap is not priced: with that rider the model's comparable motor tops out near 25.9 mph on the flat, short of 31 mph, so read Unlimited riding from the 20, 22 and 25 mph rows above.

Does going uphill drain the battery faster?

Much faster: at 10 mph on the throttle, each 1,000 feet of climbing on a 4 to 6% grade takes 231 to 264 Wh more than the same distance on the flat. Lifting you and the Z8 Pro is 42 to 48% of that; the rest goes to the motor's and the pack's losses, which rise with the grade.

A 180 lb rider on the 112 lb Z8 Pro makes 292 lb together, and raising 292 lb through 1,000 feet takes 110 Wh at the rear wheel on its own.

A 180 lb rider at a steady 10 mph; the right-hand column includes 75 W of easy pedaling from the rider. At 6% the pack spends about 307 Wh on each 1,000 feet, so a full 1,497.6 Wh lifts you about 4,900 feet with nothing kept for the flat. Holding 10 mph up an 8% grade would ask more than the controller's 1,008 W, so steeper grades are left out; on them the Z8 Pro climbs, but slower.

A hilly ride is the flat miles plus the climbing. For a 180 lb rider on the throttle, 20 level miles at 15.5 mph draw about 388.5 Wh, and 1,000 feet of 6% climbing adds about 263.8, so the ride uses about 652.3 Wh of the 1,497.6. Headwinds and stop-and-go traffic cost more than the model's steady pace, and it gives nothing back on the way down.

Does rider weight affect range?

Yes, most of all on climbs: from a 180 lb rider to a full 330 lb load, the level 15.5 mph ride falls from 77 miles to 62. Weight adds to the tires' drag and to every grade but nothing to the air's share, so the spread is widest where the road rises.

The first column is everything aboard: rider, passenger and cargo; the model adds the Z8 Pro's 112 lb to every row. Throttle only. The 220, 264 and 330 lb rows are Riding'times' own load figures: 220 lb in the record and the July 17, 2026 post, 264 lb in its May 1, 2025 post (the manual's 120 kg is 264.6 lb), and 330 lb on the product page and its FAQ.

A dash is a climb that would need more than the controller's 1,008 W at 10 mph; from a 180 lb load up, the Z8 Pro takes an 8% grade at a slower pace.

Does cold weather drain the battery?

Yes, and each drop in temperature takes more. On level pavement, a 180 lb rider on the throttle at 15.5 mph gets about 77 miles at 77 °F and about 60 at 32 °F, a 22% drop inside the 10% to 30% winter loss that Riding'times' FAQ warns of.

Level pavement, 180 lb rider. The middle column rests on McMaster University's measurements of an LG HG2 cell, recomputed for a 0.5C discharge; the laboratory measured 77, 50, 32 and 14 °F, the rows between are interpolated, and the cells are taken to sit at the air's temperature.

The brackets span other published cell data: the low end is the lowest capacity in three Samsung data sheets, the 25R and 30Q at 32 °F and the 35E at 14 °F, drained at one to four times their capacity per hour; the high end is the most energy Casado and colleagues measured in 2025 at a gentler rate.

Below freezing three losses stack: the cells give back about 89% of their 77 °F energy, the air is about 9% denser by the gas law behind the U.S. Standard Atmosphere, and cold rubber rolls harder, which the model raises by 0.5% for each °F under 77, between Rothhämel's fit for a bicycle tire and Bicycle Rolling Resistance's road-tire average, and holds at its 41 °F value below that.

Riding'times' FAQ advises "Store the battery indoors whenever possible" and "Allow the battery to warm to room temperature before charging". The packs come off with the key, so they can charge indoors, and the manual's warning about ice on the connector applies to a pack going back onto a cold bike.

Do fat tires cut range? Tires and riding position

On level ground the tires move the range more than your posture does. The drum study the model uses measured ten 26 × 4.00 fat tires at 12 psi and no 20 × 4, so the model takes their median rolling-resistance coefficient, 0.0105, and brackets it with the lowest and highest of the ten that Bicycle Rolling Resistance measured.

Miles on a full charge, 180 lb rider, level pavement. The lowest of the ten is Schwalbe's Jumbo Jim LiteSkin and the highest Kenda's Juggernaut Pro, 0.01262 on its own review page. Soft tires, sand and loose gravel roll harder than any row here.

Posture counts for more as the speed rises. The model's drag area is 0.640 m², which Tengattini and Bigazzi measured on 37 upright cruiser riders; the 0.603 m² of their 90 mountain-bike riders turns the 56-mile ride at 20 mph into 59.

Riding'times' range figures, matched to a real ride

Riding'times prints nine different range figures for the Z8 Pro across its documents, and each becomes a ride once you name the speed and the pedaling. For a 180 lb rider on level pavement, 50 miles is about 21.8 mph on the throttle, 75 miles about 15.9 mph, and 120 miles about 8.4 mph on the throttle or 15.4 mph with easy pedaling.

Each figure divides 1,497.6 Wh into watt-hours per mile, and the model finds the steady level speed that uses exactly that much for a 180 lb rider. No throttle-only speed from 5 mph up is that frugal for 150 miles; with steady pedaling (150 W) it is about 17.2 mph. The manual prints its range as "96-180KM(60-112Mile)", which "Depends on load, terrain and riding habits".

The Z8 Pro's page adds that its range depends "on riding conditions, rider weight, terrain, and riding mode", which is how the model treats every figure above: a ride, not a promise.

Hold a quarter back. A quarter held in reserve is what one measured pedelec kept unused on a test bench. For a 180 lb rider on level pavement at 15.5 mph on the throttle, that makes the planning figure 58 of the Z8 Pro's 77 miles.

How every figure here is worked out

Every row begins with the power the rear wheel must deliver to hold one speed. Martin and colleagues' model, checked against measured rides on an open road in 1998, gives it for a steady speed in still air:

Power at the wheel = v × [ m × g × (Crr × cos θ + sin θ) + ½ × ρ × CdA × v² ]

Here v is the speed; m the mass of rider, cargo and Z8 Pro; g gravity; θ the grade's angle; Crr the tires' rolling resistance, where 0.0105 means a drag of 1.05% of the weight on the tires; ρ the density of the air; and CdA the drag area, a measure of how much air the rider and bike push aside.

Inside the bracket the first term is the tires and the slope, the second the air, and once multiplied by v the air's share climbs with the cube of the speed.

Three steps lead from the wheel back to the pack:

1. The rider adds pedal power through the chain at 97.7% (Martin et al., 1998), and the rear hub motor supplies the rest.
2. The motor follows a comparable motor's published figures, the RM G0H0 geared hub in Bafang's 2021 OEM workbook (n0 510 rpm, nT 426 rpm, an efficiency of "≥ 80" percent), at the 750 W rating Riding'times gives the Z8 Pro and on its 48 V packs. On the Z8 Pro's 23.8-inch wheel it spins 36.1 mph unloaded, above the 31 mph of Unlimited Mode's throttle.
3. The pack loses a small share of its energy inside itself, at the battery efficiency Arango, Lopez and Ceren measured, and the controller's printed 48 V and 21 A cap what it may deliver at 1,008 W.

From the pack's draw, watt-hours per mile = battery watts ÷ mph, and miles = 1,497.6 Wh × the share of the pack's energy left at that temperature ÷ watt-hours per mile.

A 15.5 mph ride on the Z8 Pro, worked through: a 180 lb rider on the throttle over level pavement. The tires take 94.9 W and the air 126.0 W, 220.9 W in all at the rear wheel, which turns at 219 rpm.

The comparable motor's constants, 0.899 N·m of torque per amp, a 0.405 Ω winding and a 0.83 A no-load current, come from Bafang's published figures. At this load it makes 9.6 N·m on 11.5 A at 75.7% efficiency, below its 80% because the load is light, and draws 291.9 W.

Add the pack's own losses and the batteries supply 301.1 W, 19.43 Wh for every mile at 15.5 mph; 1,497.6 ÷ 19.43 is about 77.1 miles, or 57.8 on three quarters of a charge.

Two published benchmarks, recomputed. The road physics and the motor each return the figure their source prints:

The self-test reruns Appendix I of Martin and colleagues' paper, a 90 kg system at 8.36 m/s up a 0.3% grade, and the RM G0H0's rated point in Bafang's workbook, before any Z8 Pro figure is computed.

Brakes, lights, display and the key

Riding'times' comparison table lists "Front and rear mechanical disc brake + electronic brake" for the Z8 Pro, and its record "DUAL 160MM Disc Brake+EABS". A mechanical disc is worked by a cable, and the manual describes the electronic side: "The brake system, when properly functioning cuts off power to the motor whenever the brakes are squeezed."

The front wheel in Riding'times' studio image of the Z8 Pro: "100-406 (20X4.00)" on the sidewall, the fender, and the front disc behind the spokes.

The display includes a speedometer. The manual names it the "Intelligent LCD display for ebike; model: YL81C", with "real-time speed, maximum speed (MAXS) and average speed (AVG)", trip and odometer, a five-segment battery gauge and assist levels 0 to 5. Holding a button on the display engages push assistance, which moves the bike "at a constant speed of 6km/h" (3.7 mph) while you walk it.

The lights are "Integrated LED" on the product page, with a round headlight that the August 2026 parts list sizes at 145 × 145 × 120 mm. A key releases the packs from the frame, and the manual's diagram puts a "Three-in-one switch" on the left of the bar and the throttle, the "Acceleration handle", on the right.

Suspension, tires and water

The product page's suspension panel describes "The 6-level full suspension, featuring an aluminum hydraulic suspension fork and double spring rear suspensions", and the geometry list gives the fork 6.7 inches of travel. The comparison table words the rear as "Advanced Suspension with Rear Hydraulic Shock".

The rear coil shocks, one each side of the wheel, over the rear tire and the hub motor, in a detail image from the Z8 Pro's product page.

The tires are 20 × 4 fat tires, which the page says "provide a wide, stable contact patch on pavement, gravel, dirt, grass, and beach roads." Riding'times' studio image shows "100-406 (20X4.00)" on the sidewall, the size code to buy replacements by, and the rear tire in its close-up reads "MAX. INFLATE TO 20 P.S.I."; go by the figure on the tires fitted to your bike.

Light rain, yes; standing water, no. The July 17, 2026 post rates the Z8 Pro "IPX4", and the FAQ gives all models "an IPX5-rated exterior" and warns riders to "avoid deep water, flooding, or prolonged exposure to heavy rain whenever possible." The manual is blunt about puddles: "The bike is not designed for wading. If water level reaches the wheel hub of the rear motor, it may cause a short circuit and damage the electrical system."

For cleaning, the manual asks for "water or mild detergent and nonabrasive sponge", says "Do not use high pressure to wash the bicycle", and lists weekly oil for the chain and cogs and yearly grease for the fork, the axles and the crank axle ("Central axis"); "It is strictly forbidden to oil the brake and wheel hub."

Weight, max load and a passenger

Riding'times prints the weight as "91 (112) lbs" under "WEIGHT (W. BATTERY)" in its record, and its May 1, 2025 series post reads the pair as "91 lbs (112 lbs with battery)". Its July 17, 2026 post gives "91 lbs with battery". This review uses 112 lb with both packs, and the range limitations price the 91 lb figure too.

Its max-load figures differ by document, so plan to the lower until Riding'times confirms the higher for your bike. The product page's headline strip, its comparison table and its FAQ give 330 lb, "a maximum load of up to 330 lbs (150 kg)"; the record and the July 17, 2026 post give 220 lb; the manual gives a load of 120 kg and the May 1, 2025 post 264 lb.

The page's FAQ counts everyone and everything inside the figure: "the combined rider, passenger, and cargo weight must remain within the maximum load limit." A 180 lb rider with 30 lb of groceries is 210 lb, inside all four figures.

The memory-foam seat with the extension pad behind it and the case on the top tube, in a detail image from the Z8 Pro's product page.

On a passenger, Riding'times' documents point two ways. The page's FAQ says "The Z8 comes with an extended rear seat" for "additional seating space for different riding needs", and asks that any passenger has "secure seating and appropriate foot support"; the manual's safety list says "Obey traffic regulations and do not carry passengers on the bike." Until Riding'times confirms two-up riding for your bike, ride it alone; we will ask them for you.

Riding'times' photograph from its "Removable Seat Extension for Riding'times Z8" listing: the pad lifts off the rear rail.

The Z8 Pro is 63.8 inches long and 43.3 inches high on the geometry list; the specification table gives its shipping carton.

The Mercer fit test

The Mercers are the seven people every review on this site measures a bike against, so every machine answers the same questions (meet the Mercers).

Each verdict reads Riding'times' published window, 130 to 180 cm, its age line and its weight and load figures, the fit model's row for that height in the fit tables, and, where the rider is a minor, the age rules in the state statutes we quote.

On the Z8 Pro, the window sorts this family before the seat does. Jack is the one member above Riding'times' 180 cm top, and the GT33's geometry window covers his height; Ruth, Dana and Maya sit inside the window and stop on one foot, and most riders of Frank's and Cole's heights put both feet down.

Is it UL certified?

Riding'times answers for its range as a whole. Its FAQ answers "Are Riding'times eBikes UL Certified?" with "Yes", "certified to applicable UL safety standards, including UL 2272 and UL 2849, depending on the product", and adds: "UL certification relates to product safety standards. UL certification does not determine whether a vehicle is legal to operate in a specific location."

If you need the certificate for the Z8 Pro itself, for an insurer, a landlord or a building, ask us and we will request it from Riding'times in writing.

Has it been recalled?

No. On September 26, 2026 we searched the title, product-name and manufacturer fields of the Consumer Product Safety Commission's recall database for Riding'times, Riding times, Ridingtimes, ridert, Shenzhen Riding Robot and Riding Robot, and read all 623 records in a corpus built from bicycle, e-bike, battery and scooter terms. No record names the brand, its company or the Z8.

The same search found the recalls we already knew of, which is why its silence counts: Ancheer 1, Specialized 54 and Trek 24 in the live fields, and Ancheer 1 and Specialized 49 in the corpus.

The class question: pedals, 750 W rated, and two speed modes

Everything above is why you would want a Z8 Pro; this section tells you which mode fits the roads you ride. Riding'times titles it a "Class 3" e-bike and lists "Multi-class 1-3 with Speed Limit Setting"; the statutes turn on its pedals, its motor figure and the speed each mode reaches. Riding'times' FAQ leaves the call with the rider: "Riders are responsible for understanding and complying with local laws and regulations."

The federal consumer-product definition at 15 U.S.C. § 2085(b) is "a two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts (1 h.p.), whose maximum speed on a paved level surface, when powered solely by such a motor while ridden by an operator who weighs 170 pounds, is less than 20 mph."

California's, in Vehicle Code § 312.5(a) as read on September 26, 2026, is "a bicycle equipped with fully operable pedals and an electric motor that does not exceed 750 watts of power."

The two texts part ways at exactly 750 W, the Z8 Pro's rated figure. "Less than 750 watts" leaves a 750 W motor out; "does not exceed 750 watts" lets it in. Neither says whether the rated figure or the peak is the one measured, and Riding'times prints both, 750 W rated and 1,500 W peak.

Both definitions open with "fully operable pedals", and that line splits Riding'times' own range: the Z8 Pro has them, while the GT54 and the GT54 Pro, mini electric dirt bikes ridden on footpegs, sit outside both texts in any mode.

Sources: § 2085(b), § 312.5(a), Riding'times' product page and FAQ, read September 26, 2026.

California then splits e-bikes into three classes. A class 1 bike "provides assistance only when the rider is pedaling" and "ceases to provide assistance when the bicycle reaches the speed of 20 miles per hour". A class 2 bike has "a motor that may be used exclusively to propel the bicycle, and that is not capable of providing assistance when the bicycle reaches the speed of 20 miles per hour."

A class 3 bike assists "only when the rider is pedaling", "ceases to provide assistance when the bicycle reaches the speed of 28 miles per hour", and comes "equipped with a speedometer", which the Z8 Pro's YL81C display provides.

Source: § 312.5(a)(1) to (a)(3), read September 26, 2026, beside the speeds in Riding'times' FAQ. Under § 312.5(a)(4), a class 1 or class 3 bike may also have "a walk mode that propels the electric bicycle on motor power alone, up to a maximum speed of 3.7 miles per hour."

Before you ride on a road or a bike path, choose the mode your state allows there; if you want Riding'times' own word on how to set it on your bike, ask us and we will get it in writing.

Age and helmet rules travel with the class in California: "A person under 16 years of age shall not operate a class 3 electric bicycle" (§ 21213(a)).

Every class 3 rider and passenger on a street, bikeway or public path wears a helmet (§ 21213(b)), and so does everyone under 18 on a bicycle (§ 21212(a)). Our 50-state e-bike law atlas has every state's definition, and our California e-bike law page covers that state in depth.

On licenses and plates, Riding'times' FAQ says "Many regions allow certain eBikes to be operated without a driver's license, vehicle registration, or insurance. However, laws may differ by country, state, province, or municipality."

Where you can ride it

Your state's e-bike rules govern streets, bike lanes and paths for the mode you ride in; parks, trails and federal land each have a manager who decides. California's cities and counties write their own rules for sidewalks, paths and trails, and our California page follows them city by city.

On Bureau of Land Management ground the definition at 43 CFR 8340.0-5 reads "a two- or three-wheeled cycle with fully operable pedals and an electric motor of not more than 750 watts (1 h.p.)"; a "motorized vehicle capable of, or designed for, travel on or immediately over land" outside it is an off-road vehicle there.

The Forest Service went its own way: its final directives of March 31, 2022 "provide for managing all classes of e-bikes as motor vehicles", in the words of its notice at 87 FR 41278, and each Ranger District's motor vehicle use map shows where they may go.

Each kind of ground has its own authority and its own document, and a specification sheet is none of them.

Our public-land e-bike guide sets out the federal agencies' rules one at a time. On jumps, the manual says e-bikes "are not intended for large jumps or stunts of any kind", and Riding'times' warranty page excludes "Improper use, accidents, stunts, racing, or abuse".

Riding'times' own photograph: the Z8 Pro parked on a park lawn, both packs in the frame and the pack marked Z8 on the down tube.

Green flags / Red flags

Green flags

• Two removable packs, 1,497.6 Wh together, with two chargers, and a computed 77 miles at 15.5 mph for a 180 lb rider on the throttle over level pavement, 118 with easy pedaling.
• A 750 W rated motor with a 1,500 W peak and a 5.2:1 reduction inside the rear hub, and 80 N·m on the comparison table.
• A Limited Mode that caps the throttle and every assist level at 15.5 mph, under every speed line quoted in the class section.
• An upright cockpit: every surveyed rider from 5'10" up reaches the grips sitting straight, with about 5% of body weight on the hands.
• Pedals and a seven-speed Shimano drivetrain, so your legs can take a share of the work.
• Suspension at both ends: a hydraulic fork with 6.7 inches of travel and a coil shock each side of the rear wheel, over 20 × 4 fat tires.
• A speedometer display with trip, odometer, battery gauge, push assistance and a motor cutoff on the brakes.
• No recall on file: searched September 26, 2026, the CPSC database lists nothing under the brand, its company or the Z8.

Red flags

Each of these is about fit: the rider the Z8 Pro does not suit, and where that rider should go.

• Wrong if you want to ride this month and cannot wait for stock. Riding'times listed the Z8 Pro as sold out on September 26, 2026; the GT33 was in stock at the same $899, or email us and we will tell you when a Z8 Pro can ship.
• Wrong if you are above 5'11". Riding'times' window tops out at 180 cm; the GT33 review covers the Riding'times machine whose geometry window runs to 6'3".
• Wrong if you need both feet on the ground at every stop and stand below about 5'9". At the photographed 33.0-inch seat, 38 of 100 riders at 5'8" manage it; the foot-down table has your row, and we will check your inseam against it.
• Wrong if you plan long, hard pedaling. The seat sits well under the pedaling formula for nearly every rider; our e-bike motor guide explains which drives suit pedal-first riding.
• Wrong if you need to carry a passenger. The manual's safety list says "do not carry passengers on the bike"; email us and we will get Riding'times' answer on two-up riding for your bike in writing.
• Wrong for riders under 16, by the standard this page applies. It is a 112 lb machine with an Unlimited Mode throttle to 31 mph; our e-bike buying guide matches a legal class to a young rider.
• Wrong if it has to climb stairs. At 112 lb with both packs it belongs on the ground floor; our reviews hub lists every machine we have reviewed with its weight.

Buy it if / Buy something else if

Buy it if you want an $899 moped-style e-bike with pedals and two removable packs, a Limited Mode for the roads that ask for one, and a computed 77 miles at 15.5 mph on the throttle for a 180 lb rider on level pavement, and you stand between 4'3" and 5'11".

It also asks for a garage or ground-floor space for a 112 lb bike, a mode chosen for where you ride, a load kept inside the lower of Riding'times' figures until the higher is confirmed, and, if you are under about 5'9", comfort with stopping on one foot.

For $899 you get a 750 W rated, 1,500 W peak hub motor, 1,497.6 Wh across two packs, suspension at both ends, disc brakes with a motor cutoff and a speedometer display. Over a year with Shop Pay, our listing's sample plan comes to $81.14 a month at 15% APR, $973.68 in total, subject to an eligibility check by Affirm's lending partners.*

Buy something else if you want it now, or you are taller than 5'11" or carry cargo, where the GT33, whose geometry window runs to 6'3", takes over at the same price; if your riding is mostly dirt, where the GT73 review covers Riding'times' full-size machine with pedals; or if you want to compare moped-style machines side by side, which our electric moped guide does.

Our hub-drive e-bike guide and our commuter e-bike guide set this kind of machine against others, our Riding'times brand page compares the whole range, and our Riding'times collection shows each model's price and stock today.

Before you buy: the checklist

Ten things to settle before the $899 order; the first three decide whether the Z8 Pro is the right bike for your roads, your body and your calendar.

1. Ask us for a ship date, since Riding'times listed the Z8 Pro as sold out on September 26, 2026.
2. Measure your inseam against the foot-down table: at the photographed 33.0-inch seat, 38 of 100 riders at 5'8" and 80 of 100 at 5'10" put both feet flat.
3. Read your state's e-bike definition in our law atlas, and pick the mode your roads and paths allow.
4. Add up the rider, any cargo and any passenger, and keep it inside 220 lb until Riding'times confirms 330 for your bike; the 112 lb machine is not part of it.
5. Pick its parking spot first, ground floor or garage, and make sure a hitch rack or trailer carries well over 112 lb.
6. Cost out your regular ride with the range tables: take three quarters of your row and add the climbing.
7. Plan a dry, indoor charging spot for two packs and two chargers, and switch the pack off before plugging in.
8. Keep water and ice off the battery connectors, and never put the key in the charging port (the battery section).
9. Recheck the handlebar clamp, the pedals and the axles after the first few rides (the setup notes).
10. Ask us to confirm the speed setting before a younger family member ever rides it.

Buying it from us

Why buy the Z8 Pro from Redtail

Our listing priced the Z8 Pro at $899 on September 26, 2026, against a regular price of $1,899. The price-match with Riding'times' own store held on September 28, 2026: $899 there too, against the same $1,899. What we do for you starts before you pay and runs through the warranty.

*Rates range from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. More options may be available upon approval. State notices to consumers: affirm.com/licenses.

A change of mind has its own terms: a bike still sealed in its factory packaging, with the return requested within 72 hours of delivery, takes a 15% restocking fee plus return shipping, and a canceled order takes a 3% transaction fee. Stock, fit and mode questions cost nothing to ask, so ask them first.

Frequently asked questions

Is the Riding'times Z8 Pro worth it?

For $899 it carries two packs, 1,497.6 Wh, with a 750 W rated, 1,500 W peak hub motor, suspension at both ends and a Limited Mode at 15.5 mph, and it computes to 77 miles at 15.5 mph on the throttle for a 180 lb rider. It suits riders from 4'3" to 5'11" who can wait for stock; the verdict names the riders another of our bikes suits better.

Is the Riding'times Z8 Pro in stock?

On September 26, 2026 Riding'times' own store listed the Z8 Pro as sold out and pointed shoppers to its GT33, while our listing showed $899. Email support@redtailebikes.com before you order and we will tell you when one can ship.

How fast does the Riding'times Z8 Pro go?

It depends on the mode. Riding'times' FAQ caps every level at 15.5 mph in Limited Mode; in Unlimited Mode the assist runs to 21.7 mph and the throttle "up to 50 km/h (~31 mph)". Its documents print three top speeds: 28 mph in the headline strip, 31 in the comparison table and 32 in the record.

How far will a Riding'times Z8 Pro go on a full charge?

Riding'times prints 50 to 74 miles on the throttle and 100 to 120 with pedal assist. Computed for a 180 lb rider on level pavement, a full charge covers about 77 miles at 15.5 mph on the throttle, 56 at 20 mph and about 118 at 15.5 mph with easy pedaling; the range tables add hills, load, cold and tires.

Is the Riding'times Z8 street legal?

That turns on the mode and your state. Limited Mode's 15.5 mph sits under the federal 20 mph line and California's class 2 throttle line; Unlimited Mode's 31 mph throttle sits outside every class, and the rated 750 W meets California's "does not exceed 750 watts" but not the federal "less than 750 watts" (the class section).

Is the Z8 Pro a moped or an e-bike?

It has pedals, a chain and a mode setting, and Riding'times sells it as a "Class 3" e-bike with "Multi-class 1-3 with Speed Limit Setting". Ridden in a mode faster than your state's e-bike classes allow, it falls under whatever your state writes for faster machines; our electric moped guide lays the category out.

What is the difference between the Z8 and the Z8 Pro?

Mostly the second pack. Riding'times' record gives the Z8 one 48 V 15.6 Ah pack and the Z8 Pro two, with a second charger, a rear hydraulic shock and ranges of 50 to 74 miles on the throttle against 25 to 37. On September 26, 2026 the Pro was the only Z8 bicycle in Riding'times' catalog.

How much does the Riding'times Z8 Pro weigh?

Riding'times prints "91 (112) lbs" under "WEIGHT (W. BATTERY)" in its record, which its May 1, 2025 post reads as 112 lb with the batteries, and "91 lbs with battery" in its July 17, 2026 post. This review uses 112 lb with both packs.

What is the Z8 Pro's weight limit?

It depends on the document: 330 lb, "a maximum load of up to 330 lbs (150 kg)", on the product page and its FAQ; 220 lb in the record and the July 17, 2026 post; 264 lb in its May 1, 2025 post; 120 kg in the manual. Every figure counts the rider, any passenger and the cargo together, so plan to 220 lb until Riding'times confirms more for your bike.

Does the Z8 Pro come with a seat extension?

Yes: the page lists "a complimentary extended seat", and the August 2026 parts list counts one "Extended Seat". The page's FAQ describes a passenger on it within the max load, while the manual says "do not carry passengers on the bike", so ask us to get Riding'times' answer for your bike before you ride two-up.

What is the Z8 Pro's seat height?

On Riding'times' studio image the seat's top edge stands 33.0 inches off the ground at its lowest point, and Riding'times recommends the Z8 for riders 130 to 180 cm, 4'3" to 5'11" (the fit section).

At 5'8" the typical barefoot inseam is 32.6 inches, 0.4 inch short of the seat, and 38 of 100 riders that height put both feet flat; at 5'10" the typical 33.8-inch inseam clears it by 0.8 inch, and 80 of 100 do.

How long does the Z8 Pro take to charge?

Riding'times prints "7-9H" with its two "48V 2A" chargers, and the arithmetic agrees: 15.6 Ah at 2 A is 7.8 hours from empty, with both packs charging at once. Switch the pack off before plugging in, as Riding'times' FAQ asks.

Does the Z8 Pro have gears?

Yes: the July 17, 2026 post lists "Shimano 7-speed", the product page's detail image shows a rear derailleur marked Tourney, and the manual labels the shifter "Variable speed dial". The motor drives the wheel through its own reduction, so the gears are for your legs.

What tires does the Z8 Pro have, and what pressure?

20 × 4 fat tires: Riding'times' studio image shows "100-406 (20X4.00)" on the sidewall, the size to buy by, and the rear tire in its close-up reads "MAX. INFLATE TO 20 P.S.I." Go by the figure molded on the tires fitted to your bike.

What brakes does the Z8 Pro have?

"Front and rear mechanical disc brake + electronic brake", 160 mm discs per the record, and the brake levers cut the motor: the manual says the system "cuts off power to the motor whenever the brakes are squeezed" (Riding'times' specification).

Can you ride the Z8 Pro in the rain?

In light rain, yes: the July 17, 2026 post rates it "IPX4" and Riding'times' FAQ gives all models "an IPX5-rated exterior". The manual adds that it "is not designed for wading", so keep the water below the rear hub and off the battery connectors.

What do the Z8 Pro's error codes mean?

The manual lists six: E001 "Controller failure", E002 "Communication failure", E003 "Hall fault", E004 "Throttle Handle failure", E005 "Brake handle failure" and E006 "Motor failure". It asks for troubleshooting "in time", since the bike "will not work normally" with a code showing; send us the code and a photo and we will take it to Riding'times.

How do you assemble the Z8 Pro?

It arrives "approximately 85% pre-assembled", and the manual covers the rest: the handlebar, the front wheel on its quick release, the headlight, the cables by color, the front mudguard and the pedals, with the wrenches and screwdriver in the box. Check the brake motor cutoff before the first ride.

What warranty does the Z8 Pro have?

Bought from us, the manufacturer's two-year warranty, on the manufacturer's terms, with the claim routed through our US support desk; batteries carry "a 2-year prorated warranty" on Riding'times' warranty page, which applies its two-year term to purchases made on or after February 10, 2026. The buying section has the details.

How much does the Z8 Pro cost, and can I pay over time?

$899 on our store on September 26, 2026, against a regular price of $1,899, with free shipping in the contiguous United States. Shop Pay showed a sample plan of $81.14 a month for 12 months at 15% APR, $973.68 in total, subject to an eligibility check by Affirm's lending partners.*

Limitations of this review

Twenty-two things this review cannot settle, listed so you can weigh them.

1. We sell this bike. Weigh the red flags as carefully as the green.
2. This is a specification-verified review. Its figures come from Riding'times' published documents, statutes, our own store record, the research the range and fit sections cite, or arithmetic on this page.
3. Stock was read on one day. On September 26, 2026 Riding'times' store listed the Z8 Pro as sold out and our listing showed it at $899; ask us for a ship date before you order.
4. Every range figure is a steady ride: one speed, one grade, no wind and no stops. Traffic and headwinds cost more, and a tailwind less.
5. Bafang's figures stand in for the Z8 Pro's motor. The model uses Bafang's published figures for a geared hub at the 750 W rating Riding'times gives the Z8 Pro. With Bafang's 1,000 W version the 15.5 mph throttle figure moves from 77 miles to 79 and the 20 mph figure from 56 to 58; at 82% efficiency in place of the 80% floor, 77 becomes 81.
6. The draw ceiling is the controller's printed 48 V and 21 A, 1,008 W from the pack, which leaves out 10 mph climbs of 8% and steeper; a controller that allows more in short bursts would hold them for a while.
7. No measured ride to empty checks the model. None located states the rider's weight, the speed and a ride to empty together; the physics reproduces Martin and colleagues' worked example and the motor reproduces Bafang's 80% at the rated point.
8. The 25% planning reserve is a measured pedelec's, from researchers at KIT, used because Riding'times prints no reserve figure.
9. The tire coefficient is a 26 × 4.00 fat tire's, the median of ten on a bicycle drum, standing in for the Z8 Pro's 20 × 4; the tire table brackets it with the lowest and highest of the ten.
10. The cold figures rest on one cell's laboratory data. The central line uses McMaster University's measured LG HG2 cell, bracketed by other published cell data, because the Z8 Pro's cells are not named.
11. The wheel is measured on a photograph. The model takes 23.8 inches from the tires on Riding'times' studio image at the published wheelbase; on a 23.2-inch wheel, a figure another maker prints for its 20 × 4.0, the 15.5 mph ride moves from 77 miles to 78 and the 20 mph ride from 56 to 57.
12. The bike's weight has two figures. The model uses 112 lb with both packs; at the July 17, 2026 post's 91 lb, the 15.5 mph ride moves from 77 miles to 80 and the 20 mph ride from 56 to 58.
13. Unlimited Mode's cap is not priced. The comparable motor holds about 25.9 mph on the flat with a 180 lb rider, short of the 31 mph Riding'times prints, so the speed tables stop at 25 mph.
14. Pedaling is modeled as power alone. The effort rows add 75 or 150 W at the pedals at every speed; the gear it takes to deliver that at a given pace is not in the model.
15. Riding'times' documents give three top speeds and nine range figures: 28 mph in the headline strip and the page title, 31 in the comparison table, the page's FAQ and the site FAQ's mode list, and 32 in the record, the site FAQ's model list and the July 17, 2026 post, with its 2024 and 2025 posts giving 28 or 31; the range section maps all nine range figures to a ride.
16. They give four max loads and describe the motor several ways: 330 lb on the product page and in both FAQs, 220 in the record and the July 17 post, 264 in the May 1, 2025 post and 120 kg in the manual; "750W (Nominal)", "750W peak" and "Peak 1500W" on the product page, and 80 N·m on it, in the record and in the July 17 post, where a June 15, 2025 post gives the Z8 "64Nm". This review uses 750 W rated, 1,500 W peak and 80 N·m.
17. They give two water ratings and two views on a passenger: IPX4 in the July 17 post and IPX5 for all models in the FAQ; a passenger within the max load in the page's FAQ, and "do not carry passengers on the bike" in the manual. The FAQ's "750Wh removable dual-battery system" for the Z8 and a November 28, 2024 post's "750WH each" describe the packs in a third way.
18. The manual on Riding'times' manuals page is a 2025 file. It gives a 12-month warranty with 6 months on the battery, motor and controller, while the warranty page applies its two-year term to purchases made on or after February 10, 2026. It describes the speed-limit setting P3 both as settable and as "View only, not adjustable", and the FAQ says the mode speeds "are fixed in the software"; ask us and we will confirm the procedure for your bike with Riding'times.
19. The seat height is measured on Riding'times' studio image, 33.0 inches at the lowest point of its top edge, because the geometry list prints none. Riding'times' parts catalog lists a "Replacement Seatpost for Riding'times Z8"; its listing shows the Z8 parts diagram, where no seatpost is labeled, and no Riding'times document describes changing the seat's height, so the tables treat it as fixed.
20. The geometry list's two center lengths read in the reverse order from its own drawing and from the studio image; the fit controls hold each figure against the length the drawing gives it. The list's overall height reads 9.3% under the image's grip-top measurement.
21. The fit figures use the US Army's ANSUR II bodies: 6,068 soldiers aged 17 to 58, measured from 2010 to 2012, who are not the whole US public and hold too few bodies under 4'11" for a row, so your own inseam decides your row. A boot's sole adds its thickness to the inseam; the lean and hand figures seat the rider at the seat's lowest point, and the hand figure is a ceiling with a relaxed back.
22. The UL statement is Riding'times' own, made for its range "depending on the product"; the Z8 Pro's product page, record and manual name no UL standard for this model, and no certificate is linked. Stock and price were read on September 26, 2026 and can change.

The bottom line

For $899, the Z8 Pro puts a 750 W rated, 1,500 W peak rear hub motor and two removable packs, 1,497.6 Wh together, on a moped-style frame with pedals, a seven-speed drivetrain, suspension at both ends, disc brakes and a speedometer display.

On level pavement a 180 lb rider on the throttle gets about 77 miles at 15.5 mph and about 118 with easy pedaling, and each 1,000 feet of climbing at 10 mph takes 231 to 264 Wh on grades of 4 to 6%.

It suits riders from 4'3" to 5'11" who want the range of two packs at the price of one bike, and who are happy to stop on one foot below about 5'9". With Shop Pay on our listing, it is $81.14 a month for 12 months at 15% APR, $973.68 in total, subject to an eligibility check.*

Riding'times listed it as sold out on September 26, 2026, so email us for a ship date before you order, and ride it in Limited Mode wherever your state's e-bike lines ask for 15.5 mph or less.

Source register

Each document this review relies on, and what it supports.

T1 is the record itself, read from the party that issued it: a statute, a federal regulation or notice, the maker's own product page, record, catalog, FAQ, warranty page, manual and posts, our own store record, the lender's own pages.

T2 is a party's own publication about its product or its measurements: the motor maker's workbook, and the research groups' and laboratories' published measurements.

Expiry conditions

Re-read this page if Riding'times changes the Z8 Pro's stock, price, specification, motor figures, speed modes, class setting, range figures, load figures, geometry or rider window on its product page, FAQ, manual or posts, or if the stock, the price or the Shop Pay terms change on our store.

Re-read it as well if a recall is published naming Riding'times or its company. Verified September 26, 2026.

References

The full bibliographic record for each document cited above, with the date it was retrieved.

1. Riding'times, Z8 Pro All-Terrain Class 3 Fat Tire Electric Bike — product page (headline strip, stock notice, feature panels, Z8 vs. Z8 Pro comparison table, geometry list and drawing, the page FAQ, catalog cards, as rendered in USD). Retrieved September 26, 2026. https://www.ridingtimes.com/products/z8-moped-style-electric-bike
2. Riding'times, Z8 Pro — product record, body_html Z8 / Z8 S / Z8 Pro table, price and compare-at price, SKU. Retrieved September 26, 2026. https://www.ridingtimes.com/products/z8-moped-style-electric-bike.json
3. Riding'times, catalog feed, 132 products, page 1 of 1 (page 2 empty). Retrieved September 26, 2026. https://www.ridingtimes.com/products.json?limit=250&page=1&country=US
4. Riding'times, FAQ (About Our Ebikes: the model list with rider heights and ages, speeds by model, Limited Mode, licensing; weight limits; UL; winter riding; water; charging). Retrieved September 26, 2026. https://www.ridingtimes.com/pages/faq
5. Riding'times, User's Manual, Electric Bike Z8/Z8S, Electric Bike Z8Pro (safety, parts diagrams, assembly, Technical Parameters, battery, the YL81C display, maintenance, error codes, warranty). Retrieved September 26, 2026. https://cdn.shopify.com/s/files/1/0692/9665/2515/files/Z8-Z8PRO-Z8S-User_s_Manual.pdf?v=1752023384
6. Riding'times, Assembly Videos & Manuals page, listing the Z8 manual, the Z8 front-wheel sheet of June 8, 2026 and the Z8 Pro parts list of August 12, 2026. Retrieved September 26, 2026. https://www.ridingtimes.com/pages/assembly-videos-manuals
7. Riding'times, Z8 Pro parts list (Z8PRO Parts list, August 12, 2026: chargers, extended seat, bicycle bag, tools, parking rack). Retrieved September 26, 2026. https://cdn.shopify.com/s/files/1/0692/9665/2515/files/Z8_PRO_compressed.pdf?v=1786519728
8. Riding'times, Differences Between Z8 Series Electric Bikes, blog post, May 1, 2025 (weights with and without battery, the 264 lb load, 28 mph, chargers). Retrieved September 26, 2026. https://www.ridingtimes.com/blogs/blog/differences-between-z8-series-electric-bikes
9. Riding'times, GT33 vs Z8: Which Riding Times eBike Fits Your Commute and Weekend Rides?, blog post, July 17, 2026 (the Z8 Pro column: 32 mph, 220 lb, 91 lb, Shimano 7-speed, IPX4, 100 to 150 miles). Retrieved September 26, 2026. https://www.ridingtimes.com/blogs/blog/gt33-vs-z8-riding-times
10. Riding'times, Removable Seat Extension for Riding'times Z8 and Replacement Seatpost for Riding'times Z8, parts listings in the catalog feed. Retrieved September 26, 2026. https://www.ridingtimes.com/products/removable-seat-extension-only-for-z8
11. Riding'times, Warranty (the 2-year term and its February 10, 2026 date, What Is Covered, What Is Not Covered, Battery Coverage, the 40% parts discount). Retrieved September 26, 2026. https://www.ridingtimes.com/pages/warranty
12. US Government Publishing Office, 15 U.S.C. § 2085 — Low-speed electric bicycles, subsection (b). Retrieved September 26, 2026. https://www.govinfo.gov/content/pkg/USCODE-2024-title15/html/USCODE-2024-title15-chap47-sec2085.htm
13. California Legislative Information, California Vehicle Code § 312.5, subdivisions (a) and (a)(1) to (a)(4). Retrieved September 26, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=312.5.
14. California Legislative Information, California Vehicle Code § 21212, subdivision (a). Retrieved September 26, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=21212.
15. California Legislative Information, California Vehicle Code § 21213, subdivisions (a) and (b). Retrieved September 26, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=21213.
16. Bureau of Land Management, 43 CFR § 8340.0-5, paragraphs (a) and (j). Retrieved September 26, 2026. https://www.ecfr.gov/current/title-43/subtitle-B/chapter-II/subchapter-H/part-8340/subpart-8340/section-8340.0-5
17. US Forest Service, Directive Publication Notice, 87 FR 41278 (July 12, 2022), recording the final e-bike directives issued March 31, 2022. Retrieved September 26, 2026. https://www.federalregister.gov/documents/2022/07/12/2022-14777/directive-publication-notice
18. US Consumer Product Safety Commission, Recall database, title, product-name and manufacturer queries for Riding'times, Riding times, Ridingtimes, ridert, Shenzhen Riding Robot and Riding Robot, a full read of a 623-record corpus, and controls Ancheer / Specialized / Trek. Retrieved September 26, 2026. https://www.saferproducts.gov/
19. Redtail eBikes, Shipping policy. Retrieved September 26, 2026. https://redtailebikes.com/policies/shipping-policy
20. Redtail eBikes, Refund policy (48-hour damage window, change-of-mind and cancellation terms). Retrieved September 26, 2026. https://redtailebikes.com/policies/refund-policy
21. Redtail eBikes, Terms of service (warranty facilitation). Retrieved September 26, 2026. https://redtailebikes.com/policies/terms-of-service
22. Redtail eBikes, Z8 Pro storefront record and Shop Pay terms (price, compare-at price, sample plans). Retrieved September 26, 2026. https://redtailebikes.com/products/z8-moped-style-electric-bike
23. Affirm, Affirm's lending partners (the lenders behind Shop Pay Installments, as our listing names them). Retrieved September 26, 2026. https://www.affirm.com/lenders
24. Affirm, Inc., Licenses, Notices, and Related Disclosures (the state notices named in Shop Pay Installments' required disclosure). Retrieved September 26, 2026. https://www.affirm.com/licenses
25. BAFANG, Workbook OEM 2021, MOTORS table, RM G0H0 column: n0, nT, rated power, efficiency, maximum torque. Retrieved September 23, 2026. https://www.bafang-e.com/Uploaded/Labels/BAFANG%20Workbook%20OEM%202021.pdf
26. Martin, J. C., Milliken, D. L., Cobb, J. E., McFadden, K. L. and Coggan, A. R., Validation of a Mathematical Model for Road Cycling Power, Journal of Applied Biomechanics 14(3):276–291 (1998), Eq. 14 and Appendix I; doi 10.1123/jab.14.3.276. Retrieved September 23, 2026. https://collections.lib.utah.edu/dl_files/b4/8e/b48ef26086091662c561e673d7bd990d77868437.pdf
27. Bierman, J., Fat Bike Tires Test Results, BicycleRollingResistance.com. Retrieved September 25, 2026. https://www.bicyclerollingresistance.com/fat-bike-reviews
28. Bierman, J., Kenda Juggernaut Pro 2016, BicycleRollingResistance.com, rolling-resistance results. Retrieved September 25, 2026. https://www.bicyclerollingresistance.com/fat-bike-reviews/kenda-juggernaut-pro-2016
29. Bierman, J., CRR at Different Temperatures: Examining Temperature Dependence of Rolling Resistance, BicycleRollingResistance.com. Retrieved September 23, 2026. https://www.bicyclerollingresistance.com/specials/crr-temperature-test
30. Rothhämel, M., On rolling resistance of bicycle tyres with ambient temperature in focus, International Journal of Vehicle Systems Modelling and Testing 17:67–80 (2023); doi 10.1504/IJVSMT.2023.132317. Retrieved September 23, 2026. https://www.inderscience.com/filter.php?aid=132317
31. Tengattini, S. and Bigazzi, A. Y., Physical characteristics and resistance parameters of typical urban cyclists, Journal of Sports Sciences 36(20):2383–2391 (2018), Table 4; doi 10.1080/02640414.2018.1458587. Retrieved September 23, 2026. https://civil-reactlab.sites.olt.ubc.ca/files/2022/11/Tengattini_2018_Physical-characteristics-and-resistance-parameters-of-typical-urban-cyclists.pdf
32. Arango, I., Lopez, C. and Ceren, A., Improving the Autonomy of a Mid-Drive Motor Electric Bicycle Based on System Efficiency Maps and Its Performance, World Electric Vehicle Journal 12(2):59 (2021), Eq. (40); doi 10.3390/wevj12020059. Retrieved September 23, 2026. https://mdpi-res.com/d_attachment/wevj/wevj-12-00059/article_deploy/wevj-12-00059.pdf
33. Schmitt, M., Decker, S. and Doppelbauer, M., Measuring and Characterization of a Pedal Electric Cycle (Pedelec) on a Full System Test-Bench with Full Range Emulation of a Cyclist, EPE'19 ECCE Europe (IEEE, 2019); doi 10.23919/EPE.2019.8915567. Retrieved September 23, 2026. https://publikationen.bibliothek.kit.edu/1000100371/50695920
34. Kollmeyer, P. et al., LG 18650HG2 Li-ion Battery Data, Mendeley Data v2, McMaster University; doi 10.17632/b5mj79w5w9.2 (0.5C discharge files, recomputed). Retrieved September 23, 2026. https://doi.org/10.17632/b5mj79w5w9.2
35. Samsung SDI, Specification of Product INR18650-25R, § 7.6 Temperature dependence of discharge capacity. Retrieved September 23, 2026. https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/4628.130109_5F00_INR18650_2D00_25R-Cell-SPEC-_2800_3_2900_-_2800_1_2900_.pdf
36. Samsung SDI, Specification of Product INR18650-30Q, § 7.6 Temperature dependence of discharge capacity. Retrieved September 23, 2026. https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/INR18650_2D00_30Q_5F00_datasheet.PDF
37. Samsung SDI, Specification of Product INR18650-35E, § 7.5 Temperature Dependence of Discharge Capacity. Retrieved September 23, 2026. https://enerpower.de/wp/wp-content/uploads/2016/03/Technical_Information_INR18650-35E.pdf
38. Casado, S. et al., Evaluation of commercial Li-Ion 18650 battery cells for deep space applications, Journal of Power Sources 638:236552 (2025), Table 3; doi 10.1016/j.jpowsour.2025.236552. Retrieved September 23, 2026. https://doi.org/10.1016/j.jpowsour.2025.236552
39. NOAA, NASA and US Air Force, U.S. Standard Atmosphere, 1976 (NOAA-S/T 76-1562). Retrieved September 23, 2026. https://ntrs.nasa.gov/api/citations/19770009539/downloads/19770009539.pdf
40. Redtail eBikes, Z8 Pro range model, the computation set out in the range section of this review, every input and its source in its inputs table; run September 26, 2026. https://redtailebikes.com/blogs/journal/ridingtimes-z8-pro-review#range
41. Redtail eBikes, Z8 Pro fit model, the computation set out in the fit section of this review, every input and its source in its inputs table, the image's controls beside it; run September 26, 2026. https://redtailebikes.com/blogs/journal/ridingtimes-z8-pro-review#fit
42. U.S. Army Natick Soldier Research, Development and Engineering Center, 2012 Anthropometric Survey of U.S. Army Personnel (ANSUR II), public data release (4,082 men, 1,986 women). Retrieved September 25, 2026. https://www.army.mil/article/188601/for_good_measure_natick_releases_raw_data_from_army_wide_anthropometric_survey
43. Peveler, W., Bishop, P., Smith, J., Richardson, M. and Whitehorn, E., Comparing Methods for Setting Saddle Height in Trained Cyclists, Journal of Exercise Physiology Online 8(1):51–55 (2005), Methods and Results. Retrieved September 25, 2026. https://www.asep.org/asep/asep/JEPonlineFEBRUARY2005_PevelerSaddle.doc
44. Ferrer-Roca, V., Roig, A., Galilea, P. and García-López, J., Influence of saddle height on lower limb kinematics in well-trained cyclists: static vs. dynamic evaluation in bike fitting, Journal of Strength and Conditioning Research 26(11):3025–3029 (2012); doi 10.1519/JSC.0b013e318245c09d. Retrieved September 25, 2026. https://pubmed.ncbi.nlm.nih.gov/22190163/
45. Carahalios, A., An Analysis of the Bicycle-Rider Interface Forces in Stationary Road Cycling, MS thesis, Department of Integrative Physiology, University of Colorado (2015). Retrieved September 25, 2026. https://scholar.colorado.edu/downloads/70795789x
46. Clauser, C. E., McConville, J. T. and Young, J. W., Weight, Volume, and Center of Mass of Segments of the Human Body, AMRL-TR-69-70, Aerospace Medical Research Laboratory, Wright-Patterson Air Force Base (1969). Retrieved September 25, 2026. https://ntrs.nasa.gov/api/citations/19700027497/downloads/19700027497.pdf

Image credit: every image of the Z8 Pro on this page is Riding'times' own. The cover at the top of this page is Riding'times' studio image of the Z8 Pro, unaltered and with its own ground shadow, in a studio scene we made around it with Playcut (playcut.ai).

The card inside it is Riding'times' photograph of the Z8 Pro on a forest path with its rider, the machine and rider the photograph's own pixels and the forest and path beyond its edges a scene we made around it. The type on both is set in real fonts. The park photograph, the close-ups, the seat photographs, the manual's parts diagram and the geometry drawing are Riding'times' own.