Addmotor Grandtan X Review: 750 W Full-Suspension Trike

Full-suspension fat-tire trike · 750 W rear-mounted motor, torque sensor, throttle · 48 V 20 Ah pack of Samsung 50E cells, 960 Wh · rear differential · a disc brake on each wheel and a parking brake · 128 lb · 20 mph · Neptune Blue or Army Green · $2,899 · verified September 28, 2026

Quick Answer — Addmotor's Grandtan X is a $2,899 fat-tire trike with suspension at both ends, a 750 W rear-mounted motor, a torque sensor, a differential and a 960 Wh pack. At 12 mph on level pavement, throttle only, one charge computes to about 65 miles for a 180 lb rider, and 48 with 380 lb aboard.

At 20 mph the same level, throttle-only ride falls to about 39 miles, and easy pedaling at 12 mph stretches it to 126. Addmotor's page prints 40 to 85 miles; the range tables turn your own speed, load and hills into miles.

Two questions decide whether to order. The first is the saddle: the two saddles pictured in Addmotor's size drawing stand 2 to 2.6 inches above the seat range it prints, so the fit section works your height on both. The second is your state, where the class section sets a 750 W, 20 mph trike beside each statute's own words.

What this review covers

The specification · What the X adds · Suspension · Fit · The motor · The battery · Range · Carrying · Brakes and lights · Weight and storage · The Mercer fit test · Recalls · Class · Trails · Green flags and red flags · The verdict · Checklist · Buying it from us · FAQ · Limitations · The bottom line · References

How we verified this Addmotor Grandtan X review

The figures below were read on September 28, 2026: Addmotor's Grandtan X page with its Size & Fit, Technical, Performance and Delivery tabs, its size drawing, the trike's question board, two Addmotor blog posts about the X, our listing and the statutes in the class section. Range and fit are computed, never guessed: every formula names what goes into it, and the fit inputs read off Addmotor's drawing are measured at a checked scale.

The review is specification-verified. Its numbers come only from Addmotor's documents, the statutes, our own store and the arithmetic printed here, and the range model has to reproduce its published benchmarks before it is used. Because we sell the Grandtan X, its red flags carry as much weight here as its strengths.

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

Addmotor's Grandtan X specification, row by row

The rows come from the Technical, Performance and Size & Fit tabs of Addmotor's Grandtan X page as served on September 28, 2026; the peak power, torque, cell model and UL standard from the page's feature copy; the turn signals from Addmotor's April 11, 2025 post. A 48 V pack of 20 Ah holds 960 Wh.

What the X adds: a rear shock, a longer wheelbase and 18 pounds

Addmotor sells it as the "Grandtan X Full-Suspension eTrike", "From Forest Trails To Paved Paths", and Addmotor names its own image files for it M-340X. It keeps the Grandtan's step-through frame, three fat tires, backrest seat and wooden footrest, and it hangs the back of the trike on a spring shock under the seat.

Army Green, in Addmotor's studio image: the coil shock sits under the seat, and the flat rack spans the two rear wheels.

Addmotor's own feature copy describes the suspension in two sentences:

GRANDTAN X e-trike redefines comfort on three wheels with its dual shock absorption system, featuring Addshox front suspensions and rear spring shock absorbers. This fat tire electric trike efficiently absorbs vibrations and bumps for a smooth, enjoyable ride.

From Addmotor's Grandtan X page, quoted as written.

The X is heavier and longer than the Grandtan M-340, and its load figure is different. Addmotor's two pages set the gaps down plainly:

Each column is that trike's own page, the X and the M-340, read September 28, 2026; the prices are our store's that day. Our Grandtan M-340 review works the M-340's range and fit on their own.

The extra $500 buys the rear shock, 4.1 more inches between the axles and a handlebar that stands 3.5 inches higher on paper than the M-340's. The pack, the rated motor and the top speed are the same numbers, so the extra 18 pounds buy no more battery.

One of Addmotor's own photographs: the X on a forest dirt road, a dog in the rear basket.

Suspension at both ends: what the fork and the shock take out

The front wheel rides on an 80 mm oil-spring fork and the back of the trike on a coil shock. Addmotor's specification lists them as "Oil Spring Front Suspension with 80mm of Travel & Rear Shock Absorber".

Addmotor's April 11, 2025 post on the X spells out what each end is for: the fork softens hits "before it reaches your arms and shoulders", and the rear suspension cuts "jarring movements that would otherwise affect your lower back". Its source was an owner's video review, which the post summarizes.

The coil shock under the seat, cropped from Addmotor's studio image.

The tires are 4 inches wide, 24 × 4.0 at the front and 20 × 4.0 at the back. Addmotor's beach post says fat tires "provide extra traction on unstable surfaces" and suggests "a tire pressure of around 15-20 PSI" for sand.

Watch the derailleur on rocky ground. The same April 2025 post relays the owner's warning: "With only about 2.5–3 inches of clearance, it's important to avoid rocks and obstacles to prevent damage." Keep large rocks on the side away from the chain, and slow down where the track is broken.

Addmotor's close-up of the seven-speed Shimano thumb shifter.

Seven gears, a "7-Speed SHIMANO TOURNEY TY300 Rear Derailleur" on a "SHIMANO SIS Index 7-Speed 14-32T" freewheel, give you a low gear for starts and climbs. The stem adjusts through 90 degrees, and Addmotor's 2024 post gives its length as 100 mm.

Does the Grandtan X fit you? Saddle, step-over and reach

Addmotor prints a 32.5 to 39-inch seat range and a rider window of 5'2" to 6'4"; on that range the post puts the saddle at the fit formula's height for 95 or more of every 100 riders from 5'2" to 5'6", 78 at 5'8" and 33 at 5'10".

The saddles pictured in Addmotor's own size drawing sit higher than its labels. The drawing labels the table's 32.5 and 39 inches, but at the scale on which four of its printed lengths agree within 3.5%, the two saddles it pictures stand 35.1 and 41.0 inches up, 2.6 and 2.0 inches above those figures.

On the pictured range the formula height falls inside the post for 46 of 100 riders at 5'2", 99 at 5'6" and 94 at 5'10". Both are Addmotor's, so the tables use the printed range, and every section that turns on the saddle gives the pictured range's answer beside it. Each table places the 6,068 bodies of the US Army's 2012 anthropometric survey on the X's geometry, saddle at 109% of inseam.

Your row in three steps:

1. Measure your inseam barefoot. Back against a wall, draw a hardcover book up snug between your legs, as a saddle would sit, and have someone measure from the floor to the book's top edge.
2. Find your height below and check your inseam sits inside that row's range; on Addmotor's printed range, a longer inseam than 33.4 inches runs out of post at 109%.
3. Fine-tune at home: the setup answer gives a knee check and a heel check for the final half inch.

Eight figures in Addmotor's Size & Fit table matter for fit or for where the X will live.

Addmotor's size drawing of the Grandtan X. At the scale its 46.5-inch handlebar height sets, the reach, wheelbase, length and standover agree with the printed figures within 3.5 percent; the two saddles it pictures do not, though its labels print the table's 32.5 and 39 inches (the controls table below).

Will the seat post reach my saddle height?

On Addmotor's printed range, yes for nearly everyone from 5'2" to 5'6" and for 78 of 100 riders at 5'8"; at 5'10" 33 of 100 get there at 109%, and from 6'2" none do. The formula is Peveler's: the saddle top 109% of your inseam above the pedal axle at the bottom of the stroke (Peveler et al., 2005), with 106% the lower end Ferrer-Roca and colleagues allow.

Each row gives the floor-to-saddle height the formula sets for the median rider, and how many of 100 riders have their 109% height, and their 106% height, inside Addmotor's printed 32.5 to 39 inches (survey bodies, men and women together). Riders the post cannot reach sit a median of about 0.8 inches low at 5'10", 1.7 at 6'0" and 2.7 at 6'2".

At the top of the printed range, the post suits a 33.4-inch inseam at 109% and a 34.3-inch one at 106%. A longer leg leaves the saddle at its stop and the knee more bent at the bottom of each stroke. On the 41-inch top the drawing pictures, the same limit is a 35.3-inch inseam at 109%.

Can I stand over the frame at a stop?

Yes, easily: the smallest clearance in the table is 9.6 inches, at 5'0", for 95 of every 100 riders. You step over the wooden footrest, and Addmotor's FAQ, answering a question about riders "with limited mobility", points to the low 17.5-inch standover among its reasons.

Inseam, shoes off, less the 17.5 inches Addmotor prints; read each cell as the clearance that 95 of every 100 riders of that height have or beat.

Do the bars feel cramped or far away?

Neither: measured from the crank axle, the grips stand 33.1 to 34.7 inches up and 11.6 to 15.7 inches forward, which leaves the median rider at each height in the table leaning only 7 to 10 degrees from vertical. Upright suits comfort: asked to compare three trunk positions, the twenty recreational cyclists in Priego Quesada and colleagues' 2017 study chose the most upright.

The median rider's trunk angle from vertical, seated mid-saddle on Addmotor's printed range; the last column spans sitting forward to sitting back across the grip positions measured on the drawing. On the higher range the drawing pictures, the median lean runs 8 to 12 degrees.

How much weight goes through my hands?

At most 10 to 12 percent of your body weight with your back relaxed; the right-hand column gives it in pounds per hand. For scale, Carahalios's 2015 laboratory study measured 15% on the bars for ten road racers riding on the brake hoods; the X's upright bars ask less of your wrists than that.

Computed from segment weights (Clauser et al., 1969) with the back fully relaxed, which makes each figure a ceiling; body weights are the survey's median for each height, and the bracket spans the saddle and grip positions.

What's the fastest way to set the saddle?

Set the saddle so your knee keeps a 25 to 35-degree bend with the pedal at its lowest point (Peveler et al., 2007). Then put your heel on the pedal at the bottom of the stroke: the leg should come just straight, which is the heel check Ferrer-Roca and colleagues compared with the knee-angle method.

The quick-release clamp makes each try a flip of the lever, and the backrest travels with the saddle in Addmotor's drawing; once the height is set, the stem's 90 degrees of angle bring the grips toward you.

The fit arithmetic, step by step

Three rules drive every figure in this section. The saddle goes 1.09 × inseam above the pedal axle; the lean is the smallest trunk angle at which a straight arm reaches the grip; and the hand load is the upper body's weight scaled by that lean over the reach.

Take a 5'8" rider with the survey's median inseam of 32.6 inches. The formula calls for 35.6 inches from the pedal axle at the bottom of the stroke; take off the 7.3-inch crank and it is 28.2 inches from the crank axle, which the post's angle and position put 38.2 inches above the floor, inside Addmotor's printed 32.5 to 39.

On this drawing LeMond's rule comes out high. 88.3% of a 32.6-inch inseam, measured from the crank axle, is 28.8 inches; add back the 187 mm crank the drawing measures and the rule averages 111.0% of inseam from the pedal across the survey, beyond the 109.2 ± 0.9% Peveler and colleagues found. That points to the drawing's cranks reading long (Limitations item 16).

Addmotor prints no crank length, crank height, seatpost angle or grip position, so the model reads all four off its size drawing, a studio photograph with dimension lines drawn over it, scaled by its 46.5-inch handlebar height once the drawing has been checked against Addmotor's own lengths:

The reach line, the wheelbase, the length and the deck agree with the drawing within 3.5 percent at the 46.5-inch handlebar scale. The two saddles do not: the photographed saddle stands 2.6 inches above the printed minimum, so either it is not at its lowest setting or the printed range is not this frame's, and the section gives both answers.

The 750 W rear-mounted drive and its torque sensor

A 750 W motor drives the rear wheels through a differential, and a torque sensor reads your pedaling. Addmotor's feature copy rates it at "a max motor torque of 90 Nm and peak motor power of 1,400W" and says the rear mounting "enhances stability and balance, especially when climbing hills".

You choose between seven assist levels and a "Right Hand Half Twist Throttle with Switch". Asked whether a rider who would struggle to pedal could use a throttle, Addmotor answered on March 19, 2026 that "all our E-trikes are equipped with both a throttle and pedals, and you can use them independently depending on your preference and needs."

The differential in Addmotor's close-up: it lets the two rear wheels turn at different speeds through a corner.

The owner's review that Addmotor transcribed on its April 2025 post describes it in a corner: "One wheel will stop and the other will drive, so it doesn't check or lag going around a corner."

Addmotor publishes a top speed of 20 mph, in the Technical tab and in the page's highlights. The brakes carry a "Motor Cutoff Sensor", so squeezing a lever stops the motor pushing, which the 2025 post describes as a switch that "automatically deactivates the motor when the brakes are engaged".

The 960 Wh pack and its Samsung 50E cells

The pack is 48 V and 20 Ah, 960 Wh, built from named cells. Addmotor's battery feature reads: "A 960Wh UL 2271 battery with Samsung 50E cells. Stable 30A output and IPX6 water resistance for safety."

Addmotor's image of the pack in place behind the seat tube, the rear shock beside it.

The pack comes off. Addmotor's FAQ calls it "removable to help reduce transport weight", which also lets you carry it indoors to charge while the trike stays in the garage.

A full charge takes 10 to 11 hours. "A full charge takes about 10–11 hours," Addmotor's FAQ on the X page says, and the arithmetic agrees: 20 amp-hours at the charger's 2 amps is 10 hours before losses. A 20-to-80% top-up, the band Addmotor advises for the pack's life, is 12 amp-hours, about 6 hours.

Addmotor's battery advice holds for the X as for its other trikes. Its battery-health post recommends recharging "when it has a 10%-15% charge left", its maintenance guide says to "keep your battery charge between 20% and 80% for the best lifespan", and its cold-weather post wants the pack charged "indoors at room temperature".

How far the Grandtan X goes, empty and loaded

On level pavement a full pack carries a 180 lb rider about 65 miles at 12 mph and about 39 at 20, on the throttle alone, and the 380 lb payload about 48 miles at 12 mph. Easy pedaling at 12 mph takes the 180 lb figure to 126 miles, and a steady 8% climb at 10 mph on the throttle brings it down to about 10.

Each table is one steady ride built from Addmotor's figures, a comparable motor's published data, drum measurements of ten fat tires and field-measured drag, in the physics Martin and colleagues validated in 1998. Every figure is computed, and the formula section shows the arithmetic.

Your own figure takes three steps:

1. Pick your speed and effort in the first two tables, and move down the weight table if you carry more than 180 lb in all.
2. Add the climbing from the hills table: each 1,000 feet at 10 mph costs 170 to 221 Wh on the throttle.
3. Keep 15% in the pack, the top of the "10%-15%" Addmotor says to recharge at, and adjust for cold and tires.

How many miles at each speed, and what does pedaling add?

Every added mile an hour costs range: from 8 mph to 20 mph the level, throttle-only figure falls from 80 miles to 39. The air's share of the work grows with the cube of speed, and at 20 mph it is about 4.6 times what it is at 12.

Each row: a 180 lb rider on the throttle alone, level pavement, 77 °F air. The right-hand column keeps in the pack the 15% Addmotor says to recharge at, the top of its "10%-15%" advice.

Seventy-five watts from your legs nearly doubles the 12 mph figure, from 65 miles to 126. Easy pedaling here means 75 W and steady pedaling 150 W; with the motor off, those efforts alone would roll a 180 lb rider on this 128 lb trike at about 8.3 and 12.5 mph on the flat.

A 180 lb rider on level pavement, from a full pack. "Legs alone" marks a ride your 150 W holds with no help from the motor, since that effort carries this trike and rider at about 12.5 mph. In the 126-mile and 147-mile cells your legs supply most of the power at the wheels, which leans on the least-checked part of the model, the motor's losses at light load (Limitations item 5).

Gears, pedaling and the battery bill

Shift for your legs; only your effort changes the draw. In the model the motor turns the rear wheels apart from your chain, so the gear you pick sets your cadence, and at a given speed and grade the pack's cost per mile drops only as your own watts rise:

Pack watt-hours per mile for a 180 lb rider in 77 °F air; easy pedaling is 75 W from the rider and steady pedaling 150 W. At 12 mph on the flat, 150 W of your own holds the speed with the motor idle.

Use the low end of the seven gears for starts and climbs, and the rest for a cadence you can keep. Addmotor's range post makes the same point about stops: "When you accelerate after coming to a stop, it uses a lot of energy."

What does each hill cost the battery?

A lot: at 10 mph on the throttle, 1,000 feet of climbing on 4 to 10% grades costs 170 to 221 Wh beyond the same distance on the flat, or 154 to 200 with easy pedaling. Lifting you and the trike is 53 to 68% of the throttle figure, and the motor's losses at hard work make up the rest.

At 10 mph with 180 lb aboard; throttle only in every column but the last, where you add 75 W of easy pedaling. Past 10%, a steady 10 mph needs more than the motor's rated 750 W in the model on the throttle and with easy pedaling alike, so slow down, shift down or pedal harder.

On an 8% grade at 10 mph a 180 lb rider and the 128 lb trike make 308 lb to raise, and the pack pays 201 Wh per 1,000 feet of it. At that rate a full charge would climb about 4,800 feet and do nothing else.

How far does a full load go?

Loading the X to its 380 lb payload costs about a quarter of the level range. Going from 180 lb to 380 lb aboard takes the 12 mph ride from 65 miles to 48 and the 15 mph ride from 54 to 42. On a grade every pound is lifted as well, so the climbing column falls faster.

The rider plus everything carried; the model adds the trike's own 128 lb to every row. Throttle only. The 380 lb row is the Technical tab's payload and the 360 lb row the highlights' "280+80 LBS"; with either load, an 8% grade at 10 mph needs more than the motor's rated 750 W in the model, so pedal or slow down.

How much range does winter take?

At freezing, the 12 mph throttle ride comes to about 51 miles, and at 14 °F about 46. The cells give back about 89% of their 77 °F energy at 32 °F, cold tires roll harder, and 32 °F air is about 9% denser than 77 °F air.

Level ground, 180 lb aboard. The central figure in each row rests on McMaster University's measured LG HG2 cell, recomputed at a 0.5C discharge from the lab's 77, 50, 32 and 14 °F runs, with the rows between interpolated and the cells assumed at air temperature.

Addmotor names the X's cell, the Samsung 50E, and Samsung's 50E sheet gives one cold point, 70% of rated capacity at 14 °F at a one-hour discharge, a far harder draw than this trike's. The bracket spans the published cell data from Samsung's sheets and Casado et al., 2025.

Charge indoors before a cold ride, as Addmotor's cold-weather post advises, and plan on the lower figure in each winter row.

Does tire choice or riding posture change the range?

Rolling resistance moves the 12 mph figure from 59 to 79 miles across ten fat tires; posture moves it a mile or two. The model uses the median of the ten 26 × 4.00 tires on Bicycle Rolling Resistance's drum, bracketed by the lowest and highest of them.

Miles from a full charge, 180 lb aboard, level ground. The highest of the ten is Kenda's Juggernaut Pro, which reads 0.01262 on its own test page.

Riding position matters less at these speeds. The drag area of everyday mountain-bike riders in Tengattini and Bigazzi's field study would lift the 15 mph throttle ride from 54 miles to 55, against the upright cruiser riders the model uses.

Addmotor's 85 and 40 miles, as steady rides

Addmotor's range runs from 40 to 85 miles, and each end matches a steady ride the model can name. Addmotor's page prints "40 - 85 miles" in its Technical tab and 85 miles on PAS1 in its highlights, and its FAQ ties the ends to how you ride: "Using pure throttle or climbing steep hills brings the range closer to 40 miles, while lower pedal assist levels stretch it up to 85 miles."

Spread over 85 miles, all 960 Wh comes to 11.3 Wh a mile, which the model spends at about 6.7 mph on the throttle alone, 14.6 mph with easy pedaling or 17.7 with steady pedaling. Over 40 miles, 24.0 Wh a mile is the throttle alone at about 19.6 mph, close to the top speed.

For the pack's lifespan, Addmotor's second band is 20 to 80%. Riding inside it uses 60% of the pack, 576 Wh:

The miles inside the band, 180 lb aboard on level ground. At 8 mph your 75 W alone holds the speed, about 8.3 mph on the flat, so the motor draws nothing.

The formula behind every range figure

Holding a steady speed takes a steady flow of power at the rear wheels, and the model Martin and colleagues validated on an open road in 1998 gives it in one line for constant speed in still air:

P_wheel = (m · g · (Crr · cos θ + sin θ) + ½ · ρ · CdA · v²) · v

The first bracketed term is the tires and the slope; the second is the air, and once multiplied by v, the air's share grows with the cube of speed. Three stages lie between those wheels and the pack:

1. Your pedaling reaches the rear wheels through the chain at 97.7% efficiency, the chain figure Martin and colleagues measured, and the motor supplies the rest.
2. The motor is modeled on the shape of Bafang's RM G0H0 at 48 V, rated 750 W at no less than 80% efficiency; the model sets its unloaded speed, 21.8 mph, where a 180 lb rider on the throttle just reaches Addmotor's 20 mph.
3. The pack loses a little to its own resistance, by Arango and colleagues' measured curve, and gives up less of its energy in the cold.

One worked ride: 12 mph on level pavement, 180 lb rider, throttle only. At the wheels that ride needs 136.0 W: 77.5 W against rolling resistance and 58.5 W against the air. The 24-inch rear wheels turn 168 times a minute.

The motor model, 1.50 N·m of torque per amp, a 0.405 Ω winding and a 0.83 A no-load current, turns out 7.7 N·m on 6.0 A at 79% efficiency and draws 172.2 W.

After the pack's own losses the battery supplies 177.6 W, which at 12 mph is 14.80 Wh a mile: 960 ÷ 14.80 is about 64.9 miles, or 55.1 with 15% held in reserve.

The model reproduces two published benchmarks before it runs. It reproduces Martin and colleagues' worked example, 45.7 W for rolling and gravity and 158.8 W for the air, and the comparable motor's rated point, 80% at 750 W. At 82% motor efficiency instead of Bafang's 80% floor, the 12 mph throttle ride rises from 65 miles to 71.

No measured range ride on the Grandtan X was found. Addmotor's two-question board for the trike, the captions of three reviewer videos read in full and 242 Reddit posts were read on September 28, 2026, and none states a ride to empty with its rider's weight and speed.

Carrying: a front basket, a rear rack and the payload figures

Addmotor's product page prints two load figures for the X, and they differ by 20 pounds. The Technical tab and the FAQ give 380 lb, "Up to 380 lbs, and yes, it supports a trailer", and the highlights at the top of the same page read "Payload Capacity 280+80 LBS", 280 lb of rider and 80 lb of cargo, 360 lb in all.

Addmotor's posts have printed the X's load three ways of their own: "Payload 450Lbs" in its June 27, 2024 list, "Payload Capacity: 280 + 100 lbs." in its January 23, 2025 list and "Payload: 280 + 80 lbs" in its April 21, 2025 list.

Until the figures agree, plan on the lowest: 280 lb of rider and 80 lb of cargo. The weight table prints the product page's two loads, and at 12 mph on the throttle they differ by a mile, 49 against 48.

One of Addmotor's photographs, with a rear basket fitted, the dog waiting its turn.

In Addmotor's studio photographs the X carries a front basket and a flat rack over the rear wheels. Its carrying image lists an "Optional rear basket & waterproof bag", and the lifestyle photographs show the X with both, so ask us what ships with an order placed here before you count on either.

A trailer is the X's answer to a bigger load. The FAQ says the "reinforced rear structure connects safely to an e-trike trailer", and Addmotor's 2024 post names "a sturdy trailer tube"; a trailer is not part of our listing.

Brakes on three wheels, a parking brake and signals

Each wheel has its own disc: a 180 mm rotor at the front and two 180 mm rotors at the back, on "Mechanical Disc Brake with Motor Cutoff Sensor and Parking Brake System". Addmotor's 2024 post names the brakes as Tektro mechanical discs.

Addmotor's close-up of the parking brake.

Use the parking brake before you load or step off on a slope. A trike does not lean on a stand, so on a grade it rolls unless something holds it, and the X's "Parking Brake System" is what does.

Practice your first turns slowly. Addmotor's new-rider post advises beginning in an open area with "no obstacles or tight turns", and its beach post warns that a rider "might also need a little time to get used to how it turns and balances on uneven ground".

The EB 2.0 tail light with its amber turn signals, and the headlight on the front basket.

The lights are Addmotor's "EB 2.0" set. Its 2024 post describes the tail light as "a comprehensive 5-in-1 lighting system" with signals "for driving mode, hazard, flashing, braking, and turning", and the X adds an "Electric Horn & Mechanical Bell".

128 pounds: parking, doors and transport

At 128 lb the X is a trike you roll into place. Addmotor's FAQ says "one person can roll it easily" on flat ground, and "Lifting it requires two people, but the battery is removable to help reduce transport weight."

It runs 77.6 inches long and 32.3 inches wide in Addmotor's Size & Fit table, so a doorway needs 32.3 inches of clear width, and a garage or shed spot needs about 6.5 feet of length. Its 53.1-inch wheelbase needs room to turn in a tight space.

For a car trip, a hitch rack must be rated for 128 lb and wide enough for a three-wheeler; take the pack off before you lift the trike onto it.

Assembly is short. Addmotor's FAQ says the X "arrives 85% pre‑assembled": "You just need to attach the handlebar, seat, and front wheel," with "All necessary tools and a step‑by‑step video guide" included, and "Most people finish in 30 to 45 minutes."

The Mercer fit test

The Mercers, the same seven people, stand beside every bike we review, so each machine answers the same fit questions (meet the Mercers). Each verdict reads a figure Addmotor publishes (the rider window, both seat ranges, standover and payload) or the fit tables built from them.

For this household the X turns on the seat range more than on the trike. On Addmotor's printed range it suits Ruth, Maya and Dana at the formula saddle; on the range its drawing pictures, it suits Frank as well, and Jack and Cole should see the range confirmed first.

Has it been recalled?

No. On September 28, 2026 the Consumer Product Safety Commission's recall data held no recall naming Addmotor or a Grandtan. The search covered the title, product-name and manufacturer fields for Addmotor, ADDMOTOR, Add Motor, Addmotor Tech, Motan and Addrider and for 19 Addmotor model families, and every field of a 623-record corpus of bicycle, e-bike, battery and scooter recalls.

No record in that corpus carries an Addmotor model code, M-340X included. Before the search counted as empty, it had to find known recalls: Ancheer returned 1, Specialized 54 and Trek 24 on the same queries.

Is the Grandtan X an e-bike where you ride?

Answer this before you order. Addmotor's page publishes a 750 W motor, a throttle and a 20 mph top speed, and those sit exactly on the federal definition's lines, so each law's own wording places the X.

The federal definition, in 15 U.S.C. § 2085(b), covers "a two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts (1 h.p.)", whose motor alone tops out "less than 20 mph" on a paved level surface under a 170-pound rider.

15 U.S.C. § 2085(b) and Addmotor's Grandtan X page, both read September 28, 2026.

The X's 750 W and 20 mph equal the federal numbers, and the definition asks for less than each. Addmotor's top speed is a published figure, not the statute's motor-only test with a 170-pound rider aboard, and a specification table cannot say whether the trike would come in under 20 mph on that test.

California's line is inclusive. Read on September 28, 2026, California Vehicle Code § 312.5(a) defines an electric bicycle by "an electric motor that does not exceed 750 watts of power", ends class 2 help "when the bicycle reaches the speed of 20 miles per hour", and § 231 gives a bicycle "one or more wheels", adding "An electric bicycle is a bicycle."

Each state writes its own words, so we screened all 51 jurisdictions in our state law atlas. Against each definition's watt wording, throttle rule, top speed and wheel count, Addmotor's published figures for the X fall inside 26 jurisdictions' e-bike definitions and outside 23 through September 30, 2026; Alaska and Kentucky, the other two, publish no e-bike definition.

Each state's definition as read into our state law atlas, screened September 28, 2026. In twenty of the 23 the motor limit reads "less than" 750 watts, a line a 750 W motor misses; New Jersey's definition turns on its throttle rule, and Montana and Rhode Island write theirs for two wheels, as Alabama and New Jersey do too.

Connecticut's row changes on a known date. Public Act 26-24 § 26 rewrites its definition from October 1, 2026 to take in a motor of "not more than seven hundred fifty watts", and its definitions section, § 14-1, gives no "bicycle" of its own, so the wheel count stays open: from October 1, 22 jurisdictions are outside, and for Connecticut we will confirm how it treats a three-wheeler if you email us.

Outside a state's e-bike definition, the X is still something on that state's roads, a moped, a motor vehicle or another class, and the state's own page says what riding it asks of you. Our 50-state e-bike law atlas has each state's answer, and our California e-bike law page goes further for California.

Trails and public land: who decides

Addmotor pitches the X "From Forest Trails To Paved Paths", and on a trail the land manager's rule decides. The Bureau of Land Management writes its own 750 W line, and on national forests and BLM land the call is made locally, by each forest and field office.

43 CFR 8340.0-5, the Bureau of Land Management's definition, takes in "a two- or three-wheeled cycle with fully operable pedals and an electric motor of not more than 750 watts (1 h.p.)", so the X fits its words, and a field office may let e-bikes ride where bicycles do.

That exception holds only while "the motor is not exclusively propelling the e-bike for an extended period of time". Riding with your feet on the footrest is the motor working alone, and where the exception does not reach, 43 CFR 8341.1 keeps an off-road vehicle to land designated "open to off-road vehicle use".

National Forests treat e-bikes as motor vehicles under the Forest Service directives of March 31, 2022, "managing all classes of e-bikes as motor vehicles" in the words of the notice at 87 FR 41278, and on a district with a motor vehicle use map 36 CFR 261.13 bars riding "other than in accordance with those designations".

Every row is settled by the land manager's own document, and no row by the trike's specification.

On BLM land a violation can bring "a fine of not more than $1,000" or imprisonment "for not longer than 12 months", or both, under 43 CFR 8340.0-7. Our public-land e-bike guide sets out each agency in turn.

Green flags / Red flags

Green flags

• Suspension at both ends: an 80 mm oil-spring fork and a rear coil shock, on a trike that keeps the Grandtan's step-through frame.
• Pedal, assist or throttle: a torque sensor, seven assist levels and a throttle you can ride on alone, in Addmotor's March 19, 2026 answer.
• A 960 Wh pack of named cells, Samsung 50E, certified to UL 2271 in Addmotor's specification: about 65 miles at 12 mph on the throttle for a 180 lb rider on the level.
• A differential, a disc on every wheel and a parking brake, with a motor cutoff on the brake levers.
• Turn signals, a brake light, a horn and a bell, part of the EB 2.0 set.
• An easy step-through: at 17.5 inches, the frame leaves 9.6 inches or more of clearance for 95 of 100 riders at every height from 5'0" to 6'4".
• An upright cockpit: the median rider leans 7 to 10 degrees, with a stem that adjusts through 90 degrees.
• Two colorways at one price, both orderable on our store on September 28, 2026.

Red flags

Every flag here is a fit call: it names a rider the X does not suit and the better route for that rider.

• Wrong if your inseam is over 33.4 inches and Addmotor's printed seat range proves to be the X's. Read both answers in the saddle table before you order; the pictured range reaches 2 inches higher.
• Wrong where your state's e-bike definition stops at "less than" 750 watts and you must ride as an e-bike. The class table lists those states; tell us yours and we will point you to a trike inside its words.
• Wrong for stairs or for a doorway narrower than 32.3 inches. At 128 lb it stays at ground level; the Citytri E-310, $1,699 on our store, folds for storage.
• Wrong if your roads are smooth and $500 matters more than a rear shock. The Grandtan M-340 has the same 750 W rating and 960 Wh at $2,399, with its travel at the front.
• Wrong if you want a mid-drive that climbs through the gears. The Grandtan Turbo is Addmotor's mid-drive Grandtan, $3,399 on our store. Our Grandtan Turbo review prices its climbs gear by gear.
• Wrong if you would rather sit back in a chair. The Freetan M-368X is Addmotor's full-suspension semi-recumbent, $3,299 on our store.
• Wrong for a couple riding as one. The X has a single seat, and the M-380 tandem is Addmotor's trike for two riders.
• Wrong for sustained grades over 10% at speed. Above 10% a steady 10 mph needs more than the rated 750 W in the model, even with easy pedaling; ride slower in a low gear, or email us the climbs and we will run them.

Buy it if / Buy something else if

Buy it if you want three fat tires with suspension at both ends, a backrest seat and a throttle you can ride on alone, and your roads are broken enough to want the rear shock: computed at 65 miles at 12 mph on the throttle for a 180 lb rider on the level, and 48 with 380 lb aboard.

You will need to sit inside Addmotor's 5'2" to 6'4" window, with the seat range confirmed if your inseam is long; a ground-floor spot and a door 32.3 inches wide or more; and an indoor outlet for the pack.

The $2,899 buys a 750 W rear-mounted motor rated at 90 N·m by Addmotor and a 960 Wh pack of Samsung 50E cells, an 80 mm fork and a rear shock, a differential, a disc on every wheel, a parking brake and turn signals. Spread over 12 months with Shop Pay at 15% APR, it is $261.66 a month, $3,139.92 in total.

Buy something else if you ride mostly smooth pavement: the Grandtan M-340 has the same 750 W rating and 960 Wh pack for $2,399. A trike that must fold points to the Citytri E-310, $1,699; a tighter budget to Eunorau's ONE-TRIKE 2.0, $1,799; and two riders to the M-380 tandem, from $4,099.

Our Addmotor brand profile lays out every Addmotor on our shelf side by side, and our e-bike reviews hub collects the reviews of other makers' machines.

Before you buy: the checklist

Nine checks before you spend $2,899; the first three decide where the X can go and who can ride it.

1. Find your state in the class table and read its page in our law atlas.
2. Check the rule for each trail or park you plan to ride, since the land manager sets it.
3. Measure your inseam against the saddle table, and over 33.4 inches read both seat ranges there.
4. Measure the door and the parking spot for 32.3 inches of width and 77.6 inches of length.
5. Add up yourself and your load and keep it inside 280 lb of rider and 80 lb of cargo until Addmotor's figures agree.
6. Plan the transport: a hitch rack rated for 128 lb and a three-wheeler's width, with the pack carried separately.
7. Match your ride to a row in the range tables, add the climbing, and keep 15% of the pack back.
8. Pick a charging spot indoors, with 10 to 11 hours free for a full charge.
9. Practice turns in an open, quiet lot before the first ride out, as Addmotor advises new trike riders.

Buying it from us

Why buy the Grandtan X from Redtail

Our listing priced the Grandtan X at $2,899 in both colorways on September 28, 2026, with $3,399 shown as the regular price, the same pair of figures Addmotor's own page showed that day. What we add starts with your order.

Each colorway has its own button. Addmotor listed both in stock on September 28, 2026, and our store had both orderable at the same price.

Each button adds that colorway to your cart at $2,899, as our store listed it on September 28, 2026.

Neptune Blue, in one of Addmotor's park photographs.

Our refund policy covers a change of heart: ask within 72 hours of delivery and a trike still in its sealed factory packaging can go back, with a 15% restocking fee and the return shipping deducted, and an order canceled after it is placed carries a 3% transaction fee. Settle fit, load and route with us first and neither should come up.

Frequently asked questions

How far can the Grandtan X go on one charge?

Addmotor's page gives 40 to 85 miles, 85 on the lowest assist level. On level pavement with the throttle alone, your full pack computes to about 65 miles at 12 mph for a 180 lb rider, 39 at 20 mph, and about 48 at 12 mph with 380 lb aboard; climbing at 10 mph costs 170 to 221 Wh per 1,000 feet (the range tables).

What makes the Grandtan X different from the Grandtan M-340?

The rear shock, and what comes with it. Addmotor's figures give the X suspension at both ends where the M-340 has a fork only, 128 lb against 110, a 53.1-inch wheelbase against 49, and a 380 lb payload against 350 plus 100; you pay $2,899 for the X on our store and $2,399 for the M-340 (the comparison table).

Is the Grandtan X full suspension?

Yes. Addmotor lists "Oil Spring Front Suspension with 80mm of Travel & Rear Shock Absorber", and its studio photographs show the coil shock under the seat (the suspension section).

What battery does the Grandtan X use?

A 48 V, 20 Ah pack, 960 Wh, which Addmotor's page describes as "A 960Wh UL 2271 battery with Samsung 50E cells" with "Stable 30A output and IPX6 water resistance". You can remove it to charge indoors, and a full charge takes 10 to 11 hours in Addmotor's FAQ (the battery section).

Can you ride the Grandtan X without pedaling?

Yes. You can ride it on the throttle alone: Addmotor answered on March 19, 2026 that its e-trikes have "both a throttle and pedals, and you can use them independently". Throttle only, your pack computes to about 65 miles at 12 mph on level pavement for a 180 lb rider (the speed table).

How fast does the Grandtan X go?

20 mph is Addmotor's published top speed for the X, printed both in the Technical tab and in the highlights at the top of its page. Whether a trike that fast counts as an e-bike where you live is answered in the class section.

Is the Grandtan X street legal, and what class is it?

It depends on the words your state uses. On Addmotor's figures the X falls inside 26 jurisdictions' e-bike definitions; 23 leave it outside through September 30, 2026, twenty because their motor limit reads "less than" 750 watts, and from October 1 Connecticut's new wording brings that to 22 (the class table). Send us your state and we will reply with its rule.

What height rider does the Grandtan X fit?

Addmotor's window is 5'2" to 6'4". On its printed 32.5 to 39-inch seat range, 95 or more of every 100 riders from 5'2" to 5'6" reach the formula's saddle height, 78 at 5'8" and 33 at 5'10", and an inseam over 33.4 inches leaves your saddle at the top of the post. On the range its drawing pictures, 94 of 100 do at 5'10" (fit).

How much weight can the Grandtan X carry?

Addmotor's product page prints two figures: 380 lb in the Technical tab and the FAQ, and "280+80 LBS" in the page's highlights, 360 lb in all, and a 2024 Addmotor post gave 450 lb. Plan on the lowest until they agree; with 380 lb aboard the model still gives about 48 miles at 12 mph on the throttle over level pavement (carrying).

How much does the Grandtan X weigh?

128 lb, in Addmotor's Technical tab and its FAQ, where "one person can roll it easily" and lifting it "requires two people". Take the pack off before you lift it (parking and transport).

Does the Grandtan X have a parking brake and a differential?

Yes to both: the Performance tab lists a "Parking Brake System" with the disc brakes, and the page's feature tiles name a "Rear Speed Differential". Set the parking brake before you load the trike or step off on a slope (brakes).

Can the Grandtan X tow a trailer?

Yes. Addmotor's FAQ says "it supports a trailer" and that the "reinforced rear structure connects safely to an e-trike trailer". A trailer is not part of our listing, and its weight counts against the payload you plan on (carrying).

Does the Grandtan X come with a rear basket?

Addmotor's studio photographs show a front basket and a flat rear rack, and its carrying image lists an "Optional rear basket & waterproof bag". Email us before you order and we will confirm in writing what ships with your trike (carrying).

How much assembly does the Grandtan X need?

Addmotor says it "arrives 85% pre‑assembled right out of the box": you "attach the handlebar, seat, and front wheel", with the tools and a video guide included, and "Most people finish in 30 to 45 minutes" (parking and transport).

Can the Grandtan X handle gravel and dirt roads?

Addmotor sells it "From Forest Trails To Paved Paths", and its 2025 post passes on an owner's warning to keep rocks away from the derailleur, which has "only about 2.5–3 inches of clearance". The range tables cover pavement only; send us your usual route and we will price its paved miles and climbs (suspension).

What warranty does the Grandtan X have?

A fault after delivery is ours to handle: email photos and your order number, and we take the claim to Addmotor and see it through, as our listing commits, "at no cost to the customer". If you want Addmotor's own terms for your order in writing, ask us before you buy.

Can I finance the Grandtan X?

Yes, through Shop Pay at checkout. On September 28, 2026 our listing showed 12 payments of $261.66 at 15% APR, $3,139.92 in all, or 3 payments of $990.59; the APR you are offered, 0 to 36%, depends on eligibility.

Limitations of this review

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

1. We sell the Grandtan X and every trike its red flags route to. A red flag that sends you to another of ours still earns us the sale, so check each against the numbers it cites.
2. This review is specification-verified. Its figures come from Addmotor's published documents, statutes, our own store record, the published research the range and fit sections cite, or arithmetic on this page.
3. Each range figure is one steady ride: one speed, one grade, no wind and no stops. Stops, starts, headwinds and soft ground cost more.
4. Bafang's figures stand in for Addmotor's motor. Addmotor gives its rating, peak and torque but not its motor speeds or its gearing to the differential; at 82% efficiency instead of Bafang's 80% floor, the 12 mph throttle ride rises from 65 miles to 71.
5. At light motor load the model has no measured check. Where your legs do most of the work, as in the steady-pedaling column at 15 mph, the answer rests on motor losses we could not check against a published motor map.
6. The motor's unloaded speed is fitted to Addmotor's top speed. The model sets it where a 180 lb rider on the throttle just reaches Addmotor's 20 mph; a motor with a higher unloaded speed and a speed limiter would draw a little differently near 20 mph.
7. The model treats the rear wheels as the 20 × 4.0 tire's nominal 24-inch diameter; Addmotor prints no outer diameter, and because the unloaded speed is fitted to the top speed, a different diameter would move the range figures very little.
8. No measured range day on the Grandtan X was found. The routes read are listed at the end of the formula section.
9. Every figure assumes all 960 Wh are usable. The documents read here do not say how much of the pack the battery management releases; on one measured pedelec, researchers at KIT found 75% in use during a standard range test.
10. The tire coefficient is the median of ten 26 × 4.00 fat tires at 12 psi, a different size from the X's, and the tire table brackets it.
11. The cold figures rest on one cell's laboratory data. The central line uses McMaster University's measured LG HG2 cell; Samsung's 50E sheet gives one cold point, at a far harder discharge than a trike's.
12. The charge time is Addmotor's, "about 10–11 hours" in its FAQ; the 20-to-80% figure is 12 amp-hours at the charger's 2 amps, before charging losses.
13. Addmotor prints more than one payload. Its product page gives 380 lb in the Technical tab and FAQ and "280+80 LBS" in its highlights, and its posts have given 450 lb (June 27, 2024), 280 + 100 lb (January 23, 2025) and 280 + 80 lb (April 21, 2025); the weight table prints the product page's two, and the page advises the lowest until they agree.
14. Addmotor prints no rear-suspension travel or spring rate, so the page makes no claim about how much the rear shock absorbs.
15. The saddles Addmotor's drawing pictures sit above the seat range it prints. The drawing labels the table's 32.5 and 39 inches; at the scale on which four of its printed lengths agree, the two saddles it pictures stand at 35.1 and 41.0 inches. The fit section gives both, and we will ask Addmotor for the X's range in writing on request.
16. The cranks measure 187 mm on the drawing, and with them LeMond's rule lands at 111.0% of inseam, outside the published range; a shorter real crank would lower each formula saddle height by the difference.
17. The fit figures use the US Army's ANSUR II bodies: 6,068 soldiers aged 17 to 58, measured in 2010 to 2012, who are not the US public, so your own inseam decides your row.
18. The hand figure is a ceiling with a relaxed back. On a real ride your back and arms carry part of the load, and we found no study that measures hand load on a trike set up like this one.
19. The 109% formula is a starting point. In 19 trained cyclists it put 55 to 65% inside the 25-to-35-degree knee range and the heel check 70%, so the knee range and the heel check should settle the saddle.
20. What ships with the trike is not listed as a box list on Addmotor's X page. Its studio photographs show a front basket and a rear rack and its carrying image calls a rear basket "optional"; we will confirm in writing what ships with an order placed here.
21. The class table reads each state's definition as our law atlas records it, screened September 28, 2026; a state can change its words, as Connecticut does on October 1, 2026, and three-wheeler wording outside the definition section was not read for every state.
22. Colorways, prices and stock were read on September 28, 2026, and each can change, as can the Shop Pay terms and Addmotor's New York City delivery restriction.

The bottom line

At $2,899, the Grandtan X puts a 750 W rear-mounted motor, a torque sensor and a 960 Wh pack of Samsung 50E cells under a step-through fat-tire trike sprung at both ends, with a backrest seat, a wooden footrest, a differential, a disc on every wheel, a parking brake and turn signals.

For a 180 lb rider on level pavement, the model gives about 65 miles at 12 mph on the throttle, 126 with easy pedaling, and with 380 lb aboard still about 48; each 1,000 feet of climbing at 10 mph costs 170 to 221 Wh on the throttle.

The right owner rides rough streets, dirt roads or park tracks, wants three wheels under them and a throttle to fall back on, fits Addmotor's 5'2" to 6'4" window, and keeps the trike at ground level behind a door of 32.3 inches or more. Over 12 months on Shop Pay it is $261.66 a month at 15% APR.

Settle two things with us before you order: the seat range for your inseam, and your state's rule for a 750 W trike. Send us your height, inseam and roads, and our reply will give you both.

The X on a forest track in Addmotor's photograph, the dog riding behind.

Source register

What each document behind this review supports.

T1 is the record itself, read from whoever issued it: a statute, a federal regulation or notice, the maker's own product page, drawing, question board and posts, and our own store record.

T2 is a party's own publication about its product or its measurements: the motor and cell makers' documents and research groups' and laboratories' published measurements.

Expiry conditions

Re-read this page if Addmotor changes the Grandtan X's price, specification, motor, battery, suspension, range figures, top speed, weight, payload figures, size drawing, FAQ or question-board answers, or its New York City delivery restriction; or if the colorways, the prices, the stock or the Shop Pay terms change on our store.

Re-read it too if a state changes its e-bike definition, after Connecticut's October 1, 2026 change is read into our atlas, or if a recall is published naming Addmotor or a Grandtan. Verified September 28, 2026.

References

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

1. Addmotor Tech, Grandtan X Full-Suspension eTrike — product page (Size & Fit, Technical, Performance and Delivery tabs, highlights strip, feature sections, product FAQ, colorway options and prices, as served for the United States). Retrieved September 28, 2026. https://www.addmotor.com/products/grandtan-x
2. Addmotor Tech, Grandtan X size drawing (m-340x-size), on the product page. Retrieved September 28, 2026. https://www.addmotor.com/u_file/2602/photo/m-340x-size_1772270377.png
3. Addmotor Tech, Grandtan X carrying image (m-340x-1200x626), on the product page; its text transcribed at full size. Retrieved September 28, 2026. https://www.addmotor.com/u_file/2602/photo/m-340x-1200x626_1772270377.png
4. Addmotor Tech, Grandtan X eTrike question board, Addmotor's dated answers cited here: q2699 (March 19, 2026) and q2413 (October 16, 2025). Retrieved September 28, 2026. https://www.addmotor.com/question_p421/
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6. Addmotor Tech, Why the Grandtan X is the Best Full Suspension Electric Trike of 2025 (blog, September 13, 2024). Retrieved September 28, 2026. https://www.addmotor.com/blog/why-the-grandtan-x-is-the-best-full-suspension-electric-trike-of-2024
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16. Addmotor Tech, Best Fat Tire Electric Bikes for Adults (2025 List) (blog, April 21, 2025), its Grandtan X entry. Retrieved September 28, 2026. https://www.addmotor.com/blog/best-fat-tire-electric-bikes-for-adventure
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18. California Legislative Information, California Vehicle Code § 312.5, subdivisions (a) and (a)(2). Retrieved September 28, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=312.5.
19. California Legislative Information, California Vehicle Code § 231. Retrieved September 28, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=231.
20. Connecticut General Assembly, Public Act 26-24, section 26 (C.G.S. § 14-1(31), effective October 1, 2026). Retrieved September 28, 2026. https://www.cga.ct.gov/2026/ACT/PA/PDF/2026PA-00024-R00SB-00413-PA.PDF
21. Bureau of Land Management, 43 CFR § 8340.0-5 — Definitions, paragraphs (a)(5) and (j) (85 FR 69223, Nov. 2, 2020). Retrieved September 28, 2026. https://www.ecfr.gov/current/title-43/subtitle-B/chapter-II/subchapter-H/part-8340/subpart-8340/section-8340.0-5
22. Bureau of Land Management, 43 CFR § 8341.1 — Regulations governing use. Retrieved September 28, 2026. https://www.ecfr.gov/current/title-43/subtitle-B/chapter-II/subchapter-H/part-8340/subpart-8341/section-8341.1
23. Bureau of Land Management, 43 CFR § 8340.0-7 — Penalties. Retrieved September 28, 2026. https://www.ecfr.gov/current/title-43/subtitle-B/chapter-II/subchapter-H/part-8340/subpart-8340/section-8340.0-7
24. Forest Service, US Department of Agriculture, 36 CFR § 261.13 — Motor vehicle use. Retrieved September 28, 2026. https://www.ecfr.gov/current/title-36/chapter-II/subchapter-B/part-261/subpart-A/section-261.13
25. US Forest Service, Directive Publication Notice, 87 FR 41278 (July 12, 2022), recording the final e-bike directives issued March 31, 2022. Retrieved September 28, 2026. https://www.federalregister.gov/documents/2022/07/12/2022-14777/directive-publication-notice
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