Eunorau EKIDS20 Review 2026: 20-Inch E-Bike, Ages 8+

$899 · 24 V 250 W · 7.5 / 11 / 15.5 mph · 37.4 lb · 20-inch wheels · 200 lb payload · Ages 8 and above

Verified October 2, 2026 against Eunorau's specification, our listing, the CPSC recall database and the statutes of all 51 US jurisdictions; fit computed from 3,853 measured US children, range from Eunorau's printed figures. Reviewed by Milad Ghobadibeygvand, BScN (Western University, 2014).

Your child has outgrown the first bike, can balance and pedal, and you are looking at a 20-inch e-bike as the next one. This Eunorau EKIDS20 review answers what a parent has to settle before ordering: whether it fits your child this year, how fast it goes and how far, and whether the law where you live lets a child of that age ride it.

Eunorau builds it with pedals, a cadence sensor and a half-twist throttle, which puts it in a different legal place from a balance bike.

Quick answer: the EKIDS20 in a minute

Quick Answer — The Eunorau EKIDS20 is an $809 pedal e-bike for a child 3'5" to 5'0" tall: 20-inch wheels, a 250 W rear hub, three speed limits and front and rear disc brakes. In our model, a 62 lb child riding the throttle at a steady 7.5 mph on level pavement gets about 37 miles.

Buy it for a child of eight or more who already rides a bike and stands 4'1" or taller. The saddle starts at a published 22.4 inches, and in a survey of 3,853 measured US children, 57 of 100 at 4'1" and 93 of 100 at 4'2" sit on it with both feet flat (the fit section).

The purchase is the years between a child's first pedal bike and an adult-sized one, on a machine whose top speed is chosen at the handlebar.

What's on this page

Every figure links Eunorau's own product page or a primary source in the register at the end.

Method · Specification · Who it's for · Fit · Geometry · Speeds · Pediatric guidance · Throttle and pedals · Brakes · Battery · Range · Weight · Mercer fit test · UL · Recalls · Federal law · All 51 jurisdictions · Age rules · Green and red flags · Verdict · Checklist · Buying from us · FAQ · Limitations · Bottom line · Sources

How we verified this Eunorau EKIDS20 review

Every specification figure here was verified on October 2, 2026 against Eunorau's published specification, on the rendered page and in its storefront feed, and recomputed wherever arithmetic is involved. Each legal statement links the provision it rests on, and the words that decide it are quoted.

The fit tables come from the 3,853 children measured by Snyder et al. (1977), the age shares from the CDC's stature chart, the miles from the road-power equation of Martin et al. (1998), and the recall position from the CPSC's database and warning listing.

The author is Milad Ghobadibeygvand, BScN (Western University, 2014), who writes and reviews the bikes in this catalog. Corrections go to support@redtailebikes.com and are published on this page.

The published specification

Every row is Eunorau's, read from the Specification and Components tables on its EKIDS20 page on October 2, 2026 and cross-read against the storefront feed. The feed carries the same figures and leaves out the age guideline and the saddle row, so those two come from the rendered page.

Eunorau's own drive-side photograph of the Graphite EKIDS20: the crank and pedal behind a black chain guard, cast curved-spoke wheels on knobby tires, a disc on the front wheel, and the battery casing in the frame triangle.

Who the EKIDS20 is for

The EKIDS20 is the middle size of Eunorau's three EKIDS machines, and the first of them with pedals. The EKIDS16 is a balance bike with no pedals at all; the EKIDS20 adds a crank, a chain and a cadence sensor; the EKIDS24 adds a suspension fork and a taller window.

Your child pedals it as a bicycle. A cadence sensor reads the turning cranks, and a half-twist throttle adds power once the bike is rolling, with the top speed capped by a setting at the handlebar: 7.5, 11 or 15.5 mph.

It suits your child if they already ride a pedal bike confidently, on a frame Eunorau sizes from 3'5", and want to go further than their legs take them. The EKIDS16, from 3'0", is built for a child still learning to balance.

The brake side of the same bike: a disc and caliper on each wheel, the kickstand, and the saddle on its post behind the battery casing.

Will the EKIDS20 fit your child?

Eunorau sizes the EKIDS20 for riders 3'5" to 5'0" and prints a saddle that sits 22.4 to 26.4 inches off the ground; in a survey of 3,853 measured US children, 57 of 100 who stand 4'1" put both feet flat on the ground from the lowest setting, and 93 of 100 at 4'2".

A pedaled bike asks two things of your child's legs. When the bike stops, the feet have to reach the ground; when it rolls, each leg should nearly straighten at the bottom of the pedal stroke. The two pull the saddle in opposite directions, so this section measures both, height by height, on real children.

The children come from Snyder et al., 1977, the survey of US children's body dimensions carried out for the Consumer Product Safety Commission, whose raw records are published by UMTRI. The 2,207 of them who stood 3'5" to 5'0" were 4.6 to 13.4 years old (5th to 95th percentile), 9.0 at the median.

Find your child's fit in three steps:

1. Take the inseam in socks, back to a wall, a hardcover book pulled up snugly between the legs; the distance from the floor to the book's top edge is the number.
2. Look up their height in the tables below and set the inseam beside that row's typical range: an inseam near the top of the range has more leg to spare than the median child, one near the bottom less.
3. Check it at the bike, shoes on, on level ground (the setup steps): both feet when stopped, and the knee at the bottom of the stroke.

What saddle height does pedaling ask for?

The Hamley formula puts the saddle 109% of the inseam above the pedal at the bottom of its stroke; in a study whose short-inseam group was all children, it suited short inseams better than the 88.5% method, judged by a knee bent 30 to 40 degrees at the bottom of the stroke (Millour et al., 2021).

With the EKIDS20's 140 mm cranks that distance, measured from the crank axle, runs from 13.9 inches for the median child at 3'5" to 26.3 inches at 5'0".

The saddle height Hamley's formula asks for, measured from the crank axle to the top of the saddle along the seat, for the median child at each height, with the ends of the 106% to 110.4% range around it (Peveler et al., 2005; Ferrer-Roca et al., 2012). Children of Snyder et al. (1977), each inseam estimated from leg length (the formula section); the crank is Eunorau's 140 mm.

Eunorau prints the saddle as a height above the ground, 22.4 to 26.4 inches, and the bracket as 260 mm (10.2 in) above it, so the saddle top sits 12.2 inches above the crank axle at the lowest setting and 16.2 at the highest, measured straight up.

A seat tube leans back, so the distance along it is longer than the straight-up rise by an amount that turns on its angle; this page bounds the answer from both sides instead (Limitations). Two things follow with no angle needed:

"Surely too high": the child's formula distance is shorter than the lowest setting's straight-up rise, so no seat angle brings the saddle down to it. "Surely high enough": the formula distance is no longer than the top setting's rise, so any seat angle reaches it. Everything else in a row turns on the angle. Children of Snyder et al. (1977); Eunorau's printed saddle range and bracket height.

What the two columns tell you: only 1 of 100 children at 3'5", and none taller, would find even the lowest setting above the formula's height at any seat angle. At the top, the printed figures can vouch for the formula's height up to about 3'8": 67 of 100 children at 3'8", 3 at 3'10", none from 4'0".

From 4'0" the median child's formula distance, 18.5 inches, is more than the top setting's 16.2-inch straight-up rise, so whether the top setting reaches it turns on the seat tube's lean.

If your child is 4 feet or more, your knee check at the bike settles it (the setup steps); a leg still well bent at the bottom of the stroke with the saddle at its top mark is the sign to look at the EKIDS24.

The same study found its children, left to choose, set the saddle too low, so check the knee rather than the comfort of a low seat.

Which ages the window covers

Eunorau prints an age guideline, "Ages 8 and above", beside the 3'5" to 5'0" window. Run against the CDC's 2000 stature-for-age chart with the chart's own LMS transform, the window holds 100.0% of US boys and 100.0% of US girls at 7 and at 8, and 99.8% of both at 9.

The window's top, on the same chart, is where your child moves on: 88.8% of boys and 86.6% of girls are still inside at 11, 66.0% and 54.9% at 12, and the median child of either sex passes 5'0" at 13. Below the guideline the window already holds most children, 98.8% of boys and 98.7% of girls at 6.

The same years, read against the lowest saddle with both feet flat while seated, let you find your child's age:

Children of each whole year of age in Snyder et al., 1977, girls and boys, inseams estimated from leg length at the calibration midpoint. At 7, the two calibration ends put the flat-foot share at 39 and 54 of 100; at 8, at 84 and 92.

At Eunorau's starting age of 8, then, 87 of 100 children in the survey sit with both feet on the ground at the lowest setting, and 47 of 100 seven-year-olds do.

Can your child put both feet down?

For stopping, the reach this page computes is the one from the saddle to the ground, at the lowest setting, 22.4 inches.

The median child's barefoot inseam minus the 22.4-inch lowest saddle at each height, and how many of 100 children that height have an inseam at least as long. Children of Snyder et al. (1977), each inseam estimated from leg length; each inseam range runs from the 5th to the 95th percentile at that height. The saddle is Eunorau's printed lowest setting, unloaded.

Seated with both feet flat on the lowest setting: 1 of 100 children at 3'10", 7 at 3'11", 20 at 4'0", 57 at 4'1", 93 at 4'2", 99 at 4'3" and every child from 4'4". If your child is shorter, they reach the ground on tiptoe or by tipping the bike to one side.

Read your child's row with care where the share climbs fastest: with either adult survey's calibration in place of the midpoint, the flat-foot share at 4'1" runs from 36 to 66 of 100, and at 4'2" from 84 to 97.

How far is the reach to the bars?

Eunorau prints the frame's reach (302 mm, 11.9 in) and stack (366 mm, 14.4 in), measured from the crank axle to the head tube's top; how far your child leans to the grips depends on where the saddle sits behind that axle, so the lean is not computed here (Limitations).

Sit your child on the bike with hands on the grips and elbows relaxed. Arms locked straight mean the bars are a stretch for now; elbows crowding the knees mean the frame is getting small.

How much weight goes on your child's hands?

The share of your child's weight that rests on the bars follows from the same unplaced saddle, so it is not computed for the EKIDS20 either. As a scale only: Carahalios, 2015 measured adult road racers on the hoods putting about 15% of their body weight through the stem, a far more stretched position than a child sitting up on a 20-inch bike.

Clauser et al., 1969 weighed the body's segments: most of it is head and trunk, which an upright child carries on the saddle. For long rides, padded gloves are worth having; they lowered the pressure over the palm's ulnar nerve by 10 to 28% in 36 experienced cyclists (Slane et al., 2011).

Setting it up before the first ride

Start the saddle at 22.4 inches, sit your child on the EKIDS20 in shoes on flat ground, and watch two things: both feet reaching the ground when stopped, and a slight bend left in the knee with a pedal at the bottom of its turn.

If your child reaches the ground only on tiptoe, as most children under 4'1" do, practice stops at walking pace before any power, or wait a season; the height table shows where the ground comes within reach.

Then raise the saddle a little at a time as your child grows, checking the knee each time; when the knee stays well bent at the bottom of the stroke with the saddle at its top mark, your child has reached the end of the EKIDS20's adjustment.

Eunorau's components rows print a "Half-twist throttle, activated after reaching 3 km/h", so the first rides are pedals only until the bike is rolling; start on the 7.5 mph setting.

How the fit figures are computed

Two subtractions and one multiplication on each child's estimated barefoot inseam: the inseam minus the 22.4-inch lowest saddle for the feet; 109% of the inseam minus the 140 mm crank for the saddle's distance above the crank axle.

A 4'2" child with the survey's median inseam for that height has 23.2 inches. Against the 22.4-inch saddle that leaves 0.8 inches to spare, both feet flat. For pedaling, 109% of 23.2 is 25.3 inches from the pedal to the saddle top, and less the 5.5-inch crank, 19.8 inches above the crank axle, more than the top setting's 16.2-inch straight-up rise.

The children's survey measured standing and sitting height but not the crotch height that fit tables call the inseam, so each child's inseam is leg length (standing height minus sitting height) plus an offset two Army surveys measured on the same soldiers: −5.5 mm in ANSUR 1988, 3,982 soldiers, and +8.8 mm in ANSUR II, 6,068. The tables use the midpoint and the text gives both ends where they move a share.

Checked on the children themselves: 1,231 of them also had gluteal furrow height measured, which ANSUR 1988 ties to crotch height (+25.1 mm on average), and that second route lands 7.2 mm above the first, beside the ANSUR II end.

Nothing beyond the saddle is computed: no lean and no load on the hands (Limitations).

The geometry Eunorau publishes

Eunorau publishes the EKIDS20's geometry as a dimensioned drawing among its product images. These are its rows, transcribed.

Eunorau's geometry drawing. Row E, the bracket height, is what turns the printed saddle range into a distance above the crank in the fit section.

Two rows matter at home. The bike is 52.7 inches long, so measure your trunk or hatch before the first trip, and the shipping carton is 132.5 × 24.5 × 76 cm, about 52.2 × 9.6 × 29.9 inches.

7.5, 11 and 15.5 mph: three limits at the handlebar

Eunorau prints the top speed as "3 speed limits on the handlebar ( 7.5, 11, 15.5 MPH )", and writes that "The gear selector provides riders with three speed options". The selector is on the bars, so agree the setting with your child before each ride.

7.5 mph is an eight-minute mile. The Compendium of Physical Activities lists "Running, 7.5 mph (8 min/mile)", so at this setting you are running to keep up on foot.

11 mph is a five-and-a-half-minute mile: the Compendium's row reads "Running, 11 mph (5.5 min/mile)". Ride alongside on your own bike from here.

15.5 mph is past every running row in the Compendium, whose fastest is "Running, 14 mph (4.3 min/mile)"; it covers a mile in under four minutes. Keep it for open, quiet ground your child already knows.

The Graphite EKIDS20 from the front on the drive side: a brake lever at each grip, the front disc, and the one-piece die-cast fork Eunorau describes.

What pediatricians say about age and speed

Two pediatric publishers give you a speed line, and both attribute it to the Consumer Product Safety Commission.

The American Academy of Pediatrics' parenting site, in a page by Phyllis Agran, MD, FAAP, last updated August 21, 2026, writes: "The Consumer Product Safety Commission recommends that children age 9 through 12 years should not operate any product that travels faster than 10 mph. That means no e-bikes under 12 years." The same page continues: "If your child is 12-15 years old and you determine that they are ready, only choose a Class 1 bike."

Nemours KidsHealth, medically reviewed by Michael J. Stoner, MD, in July 2025, puts the same guidance this way: "the CPSC says that e-bikes are not recommended for kids younger than age 9. For kids ages 9 to 12, they should not operate anything that travels faster than 10 mph, as higher speeds are linked to injuries."

Set beside the EKIDS20, that guidance reads against two of Eunorau's own numbers: an age guideline of 8 and above, and a lowest speed limit of 7.5 mph. The 7.5 mph setting is under the 10 mph line both pages cite; the 11 and 15.5 mph settings are over it.

Where your child rides, and at what setting, is your decision, and the AAP's own page closes the age question the same way: check "the vehicle code in your state and regulations in your community". The age rules below are the state half of that.

The throttle wakes at 1.86 mph, and the pedals do the rest

Eunorau's Components table reads "Half-twist throttle, activated after reaching 3 km/h", and its feature text adds that "The throttle activates once the speed reaches 3km/h, ensuring a safe and gradual acceleration." 3 km/h is 1.86 mph.

So the throttle does nothing from a standstill: your child pedals or pushes off first, and power arrives once the bike rolls. A twist of the grip at a stop light does not move the bike off from under them.

Pedaling runs through one gear: a 140 mm crank on a 32-tooth chainring to a 16-tooth freewheel, with a cadence sensor that reads whether the cranks are turning. The pedaling table in the range section shows what your child's legs save the battery.

The 140 mm crank with its pedal fitted, and the chain guard Eunorau says "helps protect the chain ring teeth from strikes".

Two disc brakes, and a motor cutoff on each lever

Eunorau describes "a front and rear dual-disc brake system", and its Components table lists "160mm disc brake rotors" and "Disc brakes levers with motor cutoff switch". Each wheel has its own disc, and each lever carries the motor cutoff switch Eunorau lists.

The cockpit: a lever at each grip with its switch housing, and the coiled cable guard at the head tube.

Two levers mean two hands' worth of braking, so before the first ride check that your child's fingers wrap each lever and pull it to a firm stop. With feet flat on the ground from about 4'1" (the fit section), your child also has a way to steady the bike once it stops.

The rear wheel: disc and caliper, the hub motor, the chain on its 16-tooth freewheel, and the block-knob tread on a rim lettered "eunorau 20".

Battery, charger and charge time

The pack is 24 V and 10 Ah, 240 watt-hours, in what Eunorau calls a "EUNORAU-designed battery casing" that fills the frame triangle; its feature text says the company patented the casing's design and aligned the frame with the battery box.

The charger is a "US standard 2.0 A smart charger" and the charging time 4–5 hours. The arithmetic agrees: 10 Ah at 2.0 A is five hours for a full charge, before any slowing at the top of the cycle, so you can charge it overnight.

There is no display, and Eunorau lists a battery indicator "for clear visibility" in its features, so your child can see the charge without one.

The Cloud White colorway, the same machine and the same $899.

EKIDS20 range: how far 240 Wh carries your child

On the throttle at the 7.5 mph setting, on level pavement, a 62 lb child gets about 37 miles from the EKIDS20's 24V 10Ah pack in our model, spending 6.6 Wh a mile; held at the 15.5 mph top setting, the same pack runs out after about 17 miles.

Eunorau lists "Up to 20 Miles", and the model spends a full charge in 20 miles at a steady 14.0 mph on the flat (the ride behind Eunorau's figure).

Every row outside the weight table carries a 62 lb child: the median weight of the 2,207 children 3'5" to 5'0" tall in Snyder et al., 1977, the survey behind the fit section, 61.9 lb to the nearest pound. If your child is lighter or heavier, read the weight table.

Each row holds one pace without stopping, on smooth pavement, in still air; a ride with stops, turns and grass spends more, so read each figure as the most your child gets from one charge at that pace.

The model starts from Eunorau's printed EKIDS20 figures: a "24V 250W rear motor", a "24V 10Ah" pack, a 37.4 lb bike and "20*1.95"" tires. Every other input is in the formula section, with its source.

Reading your child's ride from the tables:

1. Find their setting in the speed table: 7.5, 11 or 15.5 mph, the three limits Eunorau puts on the handlebar, plus 13 mph, a pace on the top setting.
2. Add the slope and the weight: hill rows run from a 2% to an 8% grade, weight rows from a 38 lb child to Eunorau's 200 lb limit, and the pedaling table shows what your child's legs give back.
3. Hold 15% back for the trip home; a ride on grass or gravel ends short of its row.

How many miles at each setting?

Slower settings go further: about 37 miles at 7.5 mph, 27 at 11, 22 at 13 and 17 at 15.5, because the power the air takes grows with the cube of the pace, while the tires' share only doubles when the pace does (Martin et al., 1998).

The hub doing all the work with your child's feet resting, a 62 lb child, level pavement, still air at 77 °F, a full 24V 10Ah pack. The last column leaves 15% in the pack, the upper end of the "10-15%" at which Eunorau's FAQ advises recharging. The table stops at 15.5 mph, Eunorau's top limit.

How the hub and your child's legs share the work

The EKIDS20 has a single gear, a 32-tooth chainring to a 16-tooth freewheel, and its rear hub can hold every pace alone; in the model the hub turns 69% of the power it draws into drive at 7.5 mph and 81% at 15.5 mph. Eunorau's components rows list the motor as a "24V 250W rear motor" with a cadence sensor and a half-twist throttle.

The modeled hub holding each pace alone on level ground, a 62 lb child aboard. Motor efficiency is the power reaching the rear wheel divided by the power the hub draws; the per-mile figure also counts the pack's own losses.

When your child pedals, the hub has less to do. The next table asks what a steady 25 W at the pedals would save: a what-if, since no source here measured how long a child holds any wattage. For scale only, the 410 Finnish children aged 6 to 8 in the PANIC study reached a maximal workload averaging 3.8 W (boys) and 3.6 W (girls) per kilogram of fat-free mass on a cycle ergometer.

25 W at the pedals, through a chain Martin et al., 1998 put at 97.7% efficient; the hub supplies the rest of each pace. Pedal turns a minute follow from the 32/16 gearing on a 506 mm wheel. A 62 lb child, a full pack, still air.

At 7.5 mph on the flat, 25 W from the legs cuts the hub's spend from 6.6 to 2.7 Wh a mile. On the top setting the cranks would need about 131 turns a minute, past the 90 to 100 the cyclists in Marsh and Martin, 1997 chose, so on the top setting expect the hub to do the work.

How much a hill costs, and how fast the EKIDS20 climbs

Holding 10 mph up a paved grade, each 1,000 feet of rise costs about 51 Wh more than level ground on a 4% grade and 58 Wh more on an 8% grade. Of that, 37 Wh is the work of lifting child and bike, 99.4 lb together, through 1,000 feet; the hub and the pack lose the rest as heat.

A 62 lb child holding 10 mph on the throttle up each paved grade, a full pack, still air. At 10% and steeper, the model's 250 W hub falls below 10 mph with this child aboard, so the rows end at 8%; the climbing-pace table below gives the speed it holds.

The quickest pace the model holds up each grade, so you can find your child's weight:

Throttle only, still air, the 37.4 lb bike plus each child, the hub held to its 250 W rating and to the 28 N·m at the wheel of the comparable hub (the formula section). 38, 62 and 102 lb are the 5th percentile, median and 95th percentile weights of the window's children. No row tops 15.5 mph, the top limit.

A 62 lb child holds 11.1 mph up an 8% grade in the model, and 8.7 mph up a 12% grade. Both are ceilings on smooth pavement.

How much does your child's weight change the miles?

On level ground weight trims the miles; on a climb it decides them: at 7.5 mph a 38 lb child gets about 41 miles and a full 200 lb load about 22, while at 10 mph up an 8% grade a 38 lb child gets about 10 miles and a 102 lb child cannot hold the pace.

The rider and anything carried, on the 37.4 lb bike, a full pack, still air. 200 lb is Eunorau's "Total Payload Capacity"; 38, 62 and 102 lb are the 5th percentile, median and 95th percentile weights of the window's 2,207 children. "Past the model's motor" marks a climb the 250 W hub cannot hold at 10 mph.

How much range does the cold take?

The 37 miles at 7.5 mph become about 29 at freezing and 27 at 14 °F. Three things shift at 32 °F against a 77 °F day: the cells give back about 89% of their energy, the air is 9% denser, and the tires' rolling resistance rises 18% (Rothhämel, 2023).

7.5 mph on level ground on the throttle, a 62 lb child, a full pack. The middle figures rest on McMaster University's measured LG HG2 cell at each temperature; the 32 °F and 14 °F brackets span Samsung's 35E data sheet and Casado et al., 2025 (Limitations).

Eunorau's FAQ puts its batteries' best operating range at 10℃ to 55℃ (50 °F to 131 °F) and warns that "Battery efficiency can be severely limited outside of these temperatures"; on a cold morning, plan from the freezing row.

Do the knobby tires cost miles?

We found no laboratory rolling-resistance figure for a 20 x 1.95 knobby, so the model takes the heaviest-rolling knobby casings on Bicycle Rolling Resistance's drum, and across the plausible range the 7.5 mph figure runs from about 36 to 42 miles. Eunorau lists "20*1.95"" tires, and its photographs show a block-knob tread.

On the throttle, level pavement, a 62 lb child and a full pack. A coefficient of 0.0126 means the tires resist with 1.26% of the weight on them. The 0.0092 knobby average and its standard deviation are field measurements of 138 everyday riders in Tengattini and Bigazzi, 2018.

Each of those figures was measured on a hard surface; if your child rides lawn, sand or loose gravel, expect fewer miles than any row here.

What ride gives Eunorau's 20 miles?

Eunorau's figure is "Up to 20 Miles"; in the model a 62 lb child spends the full 240 Wh in 20 miles at a steady 14.0 mph on level pavement, or at the middle 11 mph setting up a steady 1.2% grade (Eunorau's EKIDS20 page).

Twenty miles from 240 Wh is 12.0 Wh a mile, which on the flat the hub spends between the 13 mph pace and the 15.5 mph top setting.

The same reserve applies to either figure: with 15% kept back, the model's 37 miles at 7.5 mph come down to 31, and its 17 miles at 15.5 mph to 15.

How the range figures are computed

Every row begins with the power the rear wheel needs to hold a steady pace, from the road-power equation Martin and colleagues checked against measured riders in 1998:

Wheel power = v × [ m × g × (Crr × cos θ + sin θ) + ½ × ρ × CdA × v² ]

v is the pace, m the combined mass of child, gear and bike, g gravity, θ the grade's angle, Crr the tires' rolling-resistance coefficient, ρ the density of the air and CdA the drag area.

Then back from the wheel to the cells:

1. The hub. The EKIDS20's motor sits in its rear wheel. The model borrows the published curve of Bafang's RM G383.220.D, a rear hub Bafang lists for 16 and 20 inch wheels: 335 rpm unloaded and 290 rpm at rated load at 36 V, efficiency "≥ 80" percent at that point, 28 N·m at most. It is set to the EKIDS20's 24 V and 250 W.
2. The top limit. The hub's unloaded speed is fitted so a 62 lb child reaches Eunorau's 15.5 mph on level pavement and goes no faster; it lands at 17.0 mph. With the hub at 82%, above the comparable's printed floor, the 7.5 mph row reads about 40 miles instead of 37.
3. Your child's legs. In the pedaling table only, 25 W goes through the chain and the hub supplies the rest of the pace.
4. The pack. Its cells lose some energy as heat: 3.1% at 7.5 mph, from Arango, Lopez and Ceren's measurements on a 48 V pack.
5. Miles. The cells' output divided by the speed gives watt-hours a mile, and the 240 Wh, less what the cold takes, divided by that gives the miles.

A worked ride: a 62 lb child at a steady 7.5 mph on level pavement, throttle only. Of the 33.0 W the rear wheel needs, the tires take 18.7 W and the air 14.3 W.

The 19.92-inch wheel makes 126.5 turns a minute at 7.5 mph. The modeled hub (0.799 N·m per amp, 0.248 Ω, 0.99 A unloaded) makes 2.5 N·m on 4.1 A, 69% efficient at so light a load.

The hub draws 47.6 W, and with the pack's own losses the cells give 49.1 W: 6.6 Wh a mile (6.55 unrounded). 240 ÷ 6.55 is 36.6 miles, or 31.1 with 15% held back.

What the model is checked against:

The first check is Appendix I of Martin and colleagues (90 kg, a 0.3% grade, 8.36 m/s); the second is the RM G383.220.D's rated point in Bafang's workbook; the third places the model beside Eunorau's single printed range figure, which is not an independent measurement (Limitations).

37.4 pounds, and the 200-pound payload

Eunorau publishes 37.4 lb (17 kg), in the Specification table and again as row J of the geometry drawing. That is what you lift into the car, and what your child wheels up a curb.

Within the family, the EKIDS16 is 28.6 lb at $799 and the EKIDS24 44.1 lb at $999, both on our store, the EKIDS16 read on October 2, 2026 and the EKIDS24 on October 30, 2026, so the EKIDS20 is 8.8 lb heavier than the smaller bike and 6.7 lb lighter than the larger one.

The total payload capacity is 200 lb, and for the measured children inside the height window it was the limit for none of them. None of the 2,207 children between 3'5" and 5'0" tall in the youth survey behind the fit tables weighed over 200 lb, and 95 of 100 weighed under 101.6 lb.

The Mercer fit test

Each verdict reads Eunorau's published numbers — the 3'5" to 5'0" window, the age guideline of 8 and above, the 22.4-inch lowest saddle and the 200 lb payload — with the measured-children figures from the fit section and, for a minor, the age law.

The Mercers are the fixed editorial cast we hold every machine against, so the same question is asked the same way and you can read the row nearest your own family.

The two rows that decide most purchases are Maya's and Jack's: the same saddle that 87 of 100 eight-year-olds reach flat-footed is a tiptoe stop for most six-year-olds. Height decides this bike before age does.

Is it UL certified?

Yes. Eunorau's EKIDS20 page carries a specification banner with the row "UL CERTIFIED Yes", served with its own icon.

In a company-wide post of March 5, 2023, Eunorau writes: "We are UL 2849 tested and UL 2271 tested", naming the e-bike electrical-system standard and the battery standard, and describing both certificates as voluntary.

If your school, building or insurer wants the certificate document on file, tell us before you order and we will request it from Eunorau and pass on what comes back.

Has it been recalled?

No. No federal recall names Eunorau or the EKIDS20, read October 2, 2026.

Eight e-bike title terms in the CPSC's recall database (electric bicycle, electric bike, e-bike, ebike, their plurals, pedal assist and electric scooter) together return 51 distinct federal recalls, and none of their titles names the brand or the model.

A recall titled only by a brand would slip past those words, so the brand and model were queried as title terms in the same database too: "Eunorau" returns none, and "EKIDS", which the database matches anywhere in a title and so covers "EKIDS20", returns none. Eunorau's name in the description and product-name fields returns none as well.

All 373 rows of the CPSC's product safety warning listing were then read for "Eunorau", "EKIDS20", "EKIDS 20", "EKIDS-20" and "EKIDS", and none appears.

No federal recall or product warning names Eunorau or this bike, under any of those searches, as of October 2, 2026.

Where federal law puts the EKIDS20

Federally, the EKIDS20 is a low-speed electric bicycle on Eunorau's printed figures. 15 U.S.C. § 2085(b) defines one as "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."

Each limb has a published answer: the pedals are a 140 mm crank on a 32-tooth chainring, the motor is 250 W, and the top limit is 15.5 mph. That brings the bike under the CPSC's bicycle regulation, whose § 1512.2(a)(2) uses the same words.

One definition further down is worth knowing. § 1512.2(b) calls a bicycle a "sidewalk bicycle" when its seat height is "no more than 635 mm (25.0 in)", "measured with the seat adjusted to its highest position". The EKIDS20's printed top is 26.4 inches, so it sits over that line, among the bicycles Part 1512 does not class as sidewalk bicycles.

The machine is also built and sold for children, which brings in a second federal frame. 15 U.S.C. § 2052(a)(2) defines a "children's product" as "a consumer product designed or intended primarily for children 12 years of age or younger", and the first factor it names is the manufacturer's own statement of intended use. Eunorau's page lists "Kids eBike x 1" in the box and an age guideline of 8 and above.

Eunorau's rear three-quarter photograph from the brake side: a disc on each wheel, the kickstand, the block-knob tires and the battery casing in the frame triangle.

Whose e-bike definition the EKIDS20 fits: all 51, screened

Eunorau's printed figures, 250 W, 15.5 mph and a throttle, were screened against the e-bike definition of every US jurisdiction on October 2, 2026, each definition read from the state's own code. 48 of the 51 place the EKIDS20 inside.

The three that answer otherwise:

New Jersey's definition admits pedal assistance only. P.L.2025, c.285, approved January 19, 2026 and in effect immediately apart from one insurance section, defines a low-speed electric bicycle as one whose motor "provides assistance only when the rider is pedaling". A bike with a throttle falls outside it and inside the act's "motorized bicycle", which the same act requires to be registered and its rider licensed; the age rule for both is 15.

Alaska defines no electric bicycle. AS 28.90.990(a) carries no such definition, and House Bill 8 of the 33rd Legislature, which would have added one, shows as vetoed on July 20, 2023.

Kentucky defines no electric bicycle either, and a different category reaches the EKIDS20. KRS 189.010, as amended effective July 15, 2026, contains no bicycle definition, while its subsection (26) defines an "electric low-speed scooter":

KRS 189.289(1) then reads: "A person sixteen (16) years of age or older, may operate an electric low-speed scooter on a highway, bicycle lane, or bicycle path." It names riders 16 and over and is silent on younger ones on those three surfaces, so if you live in Kentucky and plan a bike path, ask your city first.

Where a path admits only some classes, read the posted rule against the throttle. Arizona's code, for instance, defines a Class 1 electric bicycle as one whose motor "provides assistance only when the rider is pedaling" and a Class 2 as one whose motor "may be used exclusively to propel the bicycle or tricycle". The EKIDS20 carries both a cadence sensor and a half-twist throttle, so check which words your state and your trail use.

The age rules that reach a child on the EKIDS20

Eight states set an operating age that reaches a child on a bike like the EKIDS20, re-read at each state's publisher on October 2, 2026. In the other 43 jurisdictions, as read on August 19, 2026 (Georgia's again on October 2), an age floor applies to Class 3 bikes only or none was found, and in three of those, Alaska, the District of Columbia and South Carolina, we located no operating-age provision either way.

Hawaii and Maine set their floors on Class 2 and Class 3; both define a Class 2 as one whose motor can propel the bike by itself (Hawaii, Act 259; Maine, 29-A M.R.S. § 101(22-B)). Hawaii's act defines "direct supervision" as a parent, guardian or adult "physically present and in reasonable proximity to observe and control" the ride.

Three of these change on dates already set in law:

• Illinois becomes the ninth on January 1, 2027. Public Act 104-0854, approved August 26, 2026, rewrites 625 ILCS 5/11-1517(h): "A person may operate a Class 1 or Class 2 low-speed electric bicycle only if the person is 15 years of age or older."
• Oregon splits its floor on January 1, 2027. House Bill 4007, Oregon Laws 2026 chapter 101, sets 14 for a Class 1 and 16 for a Class 2 or 3, and lets a child of any age ride a Class 1 or 2 "if the person is participating in a bicycle safety program".
• Utah rewrites its rule on May 5, 2027. The version of § 41-6a-1115.5 effective that day lets a child of 8 to 15 ride with the motor engaged on a highway under the direct supervision of a parent or another responsible adult, or with a personal electric vehicle safety certificate, and keeps under-8s off the highway.

The EKIDS20's window runs from about 4.6 to 13.4 years old in the survey, the 5th to the 95th percentile of the measured children (the fit section), so in the states above most of its riders are below the floor. Your city may add its own rules on top, and your state's law page is where you start reading them.

Green flags / Red flags

The first list is what the record supports: Eunorau's specification, the measured children, the statutes and the recall database. The second is about fit: who this machine is wrong for, and where to go instead.

Green flags

• The age guideline and the height window agree. At Eunorau's starting age of 8, 100.0% of US children of both sexes are inside its 3'5" to 5'0" window on the CDC's stature chart.
• Both feet reach from about 4'1". At the 22.4-inch lowest saddle, 57 of 100 measured children at 4'1" and 93 of 100 at 4'2" sit flat-footed, and every child from 4'4".
• Two disc brakes with motor cutoff. 160 mm rotors front and rear, and each lever cuts the motor.
• The throttle waits for a rolling bike. Nothing happens below 1.86 mph, so the first push is your child's.
• Three speed limits. 7.5, 11 and 15.5 mph at the handlebar, and the lowest sits under the 10 mph line the AAP and Nemours cite.
• A real pedal bike underneath. A 140 mm crank, a 32/16 single speed and a cadence sensor; at 7.5 mph, 25 W from the legs cuts the motor's spend from 6.6 to 2.7 Wh a mile in the model.
• No federal recall or product warning names the brand or this bike, read October 2, 2026.
• UL certified: Yes, on Eunorau's own specification banner.
• The charge time and the range hold up against the pack. 10 Ah at 2.0 A is five hours against a published 4–5, and the model meets Eunorau's 20 miles at a steady 14.0 mph on the flat.
• Price parity. $899 at Eunorau and $899 here, both colorways, read October 2, 2026.

Red flags

• A child under about 4'1" who needs both feet down. Eunorau's window opens at 3'5", and the flat-foot test at the lowest saddle is passed by none of 100 measured children at 3'5" to 3'9", 1 at 3'10" and 20 at 4'0". Sit your child on it in shoes, check the height table, and for a smaller child read the EKIDS16 review.
• A child whose knee stays well bent with the saddle at its top mark. For children from 4'0", the printed figures cannot show the top setting reaches the pedaling height the Hamley formula sets, so check the knee at the bike (the setup steps); a child past it reads the EKIDS24 review, whose window runs to 5'5".
• A family in one of the eight states with an age floor, and a child under it. New Jersey's floor is 15 and New York's and Pennsylvania's 16; the statutes are in the age table. Read the table, and send us your state if you want the rule read with you.
• A child who has not yet learned to balance. Learning balance on a 37.4 lb bike with a throttle is the harder way round; the EKIDS16 is the balance bike in the same family.
• A rider who wants gears for long hills. There is one gear, and the 250 W hub holds 11.1 mph up an 8% grade with a 62 lb child in the model. For steeper, longer climbs, tell us the route and we will run it through the model before you order.

Buy it if / Buy something else if

Buy it if your child is 8 or older, rides a pedal bike already, and is between about 4'1" and 5'0" tall. On those terms the CDC arithmetic puts 100.0% of eight-year-olds inside the window, and 87 of 100 measured eight-year-olds sit flat-footed on the lowest saddle.

The same arithmetic sets the purchase's span on the CDC chart: from 8 to 13, when the median child passes 5'0", is about five years, which puts $899 at about $180 a year. Shop Pay splits it into four interest-free payments of $224.75, or 12 monthly payments of $81.14 at 15% APR.

Buy something else if your child is under about 4'1" or still learning to balance: the EKIDS16, $719, is the pedal-less balance bike for 3'0" to 4'5". If your child is past 5'0", or near it, the EKIDS24, $899, runs a window to 5'5" and adds a suspension fork.

Before you buy: the checklist

Settle these before the box arrives, in order; each takes a few minutes.

1. Measure your child's height. Between 41 and 60 inches is Eunorau's window.
2. Measure the inseam with a book against a wall (the three fit steps). An inseam of 22.4 inches or more puts both feet flat at the lowest saddle, and the height table shows how many of 100 children your child's height clear it.
3. Read your state's age rule. The age table lists the eight states whose floor reaches this bike, and your state's law page covers the paths and sidewalks.
4. Choose the first speed together. Start at 7.5 mph, and move up when your child has earned it.
5. Check both brake levers fit the hand. Your child should pull each to a firm stop.
6. Plan the charging spot. Five hours on the 2.0 A charger, in a room your household is comfortable charging in.
7. Have the helmet first. Fit it before the bike arrives, so it is already normal on the first ride; Maine's § 2063(14)(H)(3), for one, requires it of every rider under 16.

Buying it from us

Why order it here rather than from Eunorau? The price is the same, shipping is free to the lower 48, we coordinate Eunorau's warranty for you, and if the carton arrives damaged the carrier claim is ours to file. Each row links the document behind it.

A change-of-mind return must be unopened and within 72 hours of delivery, with a 15% restocking fee and return shipping, and a canceled order carries a 3% transaction fee; our refund policy has the detail, and the size check above is how you order the right size once.

Cloud White from the front: the same frame, fork and wheels as the Graphite, at the same $899.

What we will not do is print a figure Eunorau has not published or that we have not computed from one it has. Specification figures are Eunorau's, verified at the source; modeled figures say they are the model's and list their inputs; survey figures name the survey.

Frequently asked questions

What height is a 20 inch bike for?

For the EKIDS20, Eunorau prints 3'5" to 5'0". Height alone does not settle it: with the saddle at its lowest, 22.4 inches, both feet reach the ground flat for 57 of 100 measured children at 4'1" and 93 of 100 at 4'2", so if your child is shorter than that, expect stops on tiptoe at first (the height table).

Can an 8 year old ride a 20 inch bike?

Most can ride this one. Eunorau's guideline starts at 8, 100.0% of eight-year-olds on the CDC chart are inside the 3'5" to 5'0" window, and 87 of 100 measured eight-year-olds sit on the 22.4-inch saddle with both feet flat. Measure your child's inseam against 22.4 inches before you order.

Can a 6 year old ride a 20 inch bike?

On this bike, few six-year-olds reach the ground: 16 of 100 measured six-year-olds sit flat-footed on the 22.4-inch saddle, and Eunorau's age guideline begins at 8. If your child is six, the EKIDS16 is the size Eunorau builds for them, with a saddle from 18.5 inches.

Is a 20 inch bike big enough for a 10 year old?

For most ten-year-olds, yes: on the CDC chart 97.8% of boys and 97.9% of girls of 10 are inside the EKIDS20's window, and the median child stays inside until 13. If your ten-year-old is already near 5'0", look at the EKIDS24 instead.

What size electric bike for an 8 year old?

Size by height and inseam, then age. At 8 the median child in the youth survey stood 51.1 inches, inside the EKIDS20's window, and 87 of 100 had the inseam for both feet flat at its lowest saddle. If your child is under about 4'1", the 16-inch EKIDS16 fits them better this year.

How fast do kids electric bikes go?

The EKIDS20 goes 7.5, 11 or 15.5 mph, chosen at the handlebar, so you and your child pick the setting before you ride. The AAP and Nemours both cite the CPSC's guidance that children 9 to 12 should not ride anything faster than 10 mph; the 7.5 mph setting sits under that line (the pediatric guidance).

How old do you have to be to ride an electric bike?

It depends on your state. Of the 51 US jurisdictions, eight set an age that reaches a bike like the EKIDS20: Minnesota and New Jersey 15, New York, Pennsylvania and, through 2026, Oregon 16, Maine 16 for Class 2 and 3, Hawaii 16 unless a parent supervises on Class 2 and 3, and Utah, until May 5, 2027, a supervision rule under 14 (the age table). Illinois adds 15 on January 1, 2027.

Are kids electric bikes legal?

On Eunorau's figures the EKIDS20 sits inside the e-bike definition in 48 of 51 US jurisdictions; New Jersey's covers pedal assistance only, and Alaska and Kentucky define no electric bicycle (the 51-jurisdiction screen). Whether your child may ride it is then the age rule, the eight states that set one, and your city's path and sidewalk rules.

Are electric bikes safe for 12 year olds?

The AAP's page advises that if your child is 12 to 15 and you judge them ready, you "only choose a Class 1 bike", and that children 9 to 12 should not ride anything faster than 10 mph (the pediatric guidance). On the EKIDS20, that points to the 7.5 mph setting, both disc brakes, a fitted helmet and ground your child already knows.

How long does the battery last, and how far does it go?

On the EKIDS20, a 62 lb child gets about 37 miles at a steady 7.5 mph on level pavement on the throttle, about 27 at 11 mph and about 17 at 15.5 mph, from the 240 Wh pack in our model; Eunorau prints "Up to 20 Miles". Your child's hills, weight and cold mornings all take miles, and the range section lets you look up your own ride.

How do I charge a kids electric bike?

The EKIDS20 charges on its US standard 2.0 A smart charger in 4–5 hours, and 10 Ah at 2.0 A works out to five, so you can charge it overnight. Eunorau's FAQ suggests recharging with 10–15% left, and gives its batteries' best operating range as 10℃ to 55℃.

Can a 20 inch bike fit in a car?

The EKIDS20 is 52.7 inches long on Eunorau's geometry drawing and weighs 37.4 lb, so measure your trunk or hatch against 52.7 inches. Its shipping carton is about 52.2 × 9.6 × 29.9 inches.

Do 20 inch bikes have gears?

The EKIDS20 has one: a 32-tooth chainring to a 16-tooth freewheel, "Single speed" in Eunorau's words. Your child pedals that one gear; the three handlebar settings are speed limits for the motor, not gears, and the 250 W hub does the work on climbs.

How do I measure bike seat height?

Measure from the ground to the top of the saddle, straight up, which is how Eunorau prints the EKIDS20's range: 22.4 to 26.4 inches. Compare it with your child's inseam, taken in socks against a wall with a book; an inseam at least as long as the saddle height means both feet flat (the formula section).

How much are kids electric bikes?

The EKIDS20 is $899, at Eunorau and here, read October 2, 2026, or four interest-free Shop Pay payments of $224.75. If you buy at Eunorau's starting age of 8, the median child fits it for about five years, about $180 a year.

Limitations of this review

Numbered, so a later correction can point at one.

1. We sell this bike, so read the red flags as closely as the green. Every specification figure is Eunorau's own, verified at the source and recomputed where arithmetic is involved, and our evidence on this machine is data and math.
2. Every share here describes a population. A count of children at a height or an age is never a prediction about one child; measure yours.
3. The flat-foot and pedaling shares come from children measured in 1975 to 1977 (Snyder et al., 1977), and the age shares from the CDC's 2000 growth charts; the fit tables are read by height.
4. No inseam was measured on those children. Each is estimated from leg length with an offset from two adult Army surveys that differ by 14.3 mm (ANSUR 1988 and ANSUR II); the tables print the midpoint, and the fit section prints both ends where they move a share.
5. The check on that estimate is calibrated on adults too. The 1,231 children with a gluteal furrow height land 7.2 mm above the first route, through an offset from ANSUR 1988.
6. The saddle is Eunorau's printed height, unloaded, against a barefoot inseam. Shoes add a little reach and the tables leave them out.
7. Eunorau's geometry drawing gives the bracket height, reach and stack but not the seat tube's angle. The pedaling table therefore gives what holds at any angle, and the lean to the bars, the grip position and the load on the hands are not computed.
8. The saddle formula was studied on few children. Millour et al., 2021 measured 26 cyclists, and only the short-inseam group were children.
9. The range model holds one steady pace on smooth, level or evenly graded pavement in still air. Stops, turns and grass spend more, so each row is the most a charge gives at that pace.
10. The motor is modeled on a comparable. The model runs Bafang's published RM G383.220.D curve set to Eunorau's 24 V, 250 W and 15.5 mph top limit; at 82% efficiency instead of the workbook's 80% floor, the 7.5 mph row reads about 40 miles.
11. The pedaling table is a what-if. 25 W is a chosen input, not a measurement of a child; the PANIC figures are a maximal effort on an ergometer, quoted for scale only.
12. The drag area is the one measured on upright adult riders by Tengattini and Bigazzi, 2018; a child presents less frontal area, which would add miles, more at the faster settings.
13. We found no laboratory rolling-resistance figure for a 20 × 1.95 knobby, so the tires are bracketed between the heaviest knobby casings on Bicycle Rolling Resistance's drum and the field average of Tengattini and Bigazzi.
14. The wheel is the size's nominal 506 mm. Circles fitted on Eunorau's geometry drawing did not hold to the tire's outline closely enough to use, so the model takes the ISO 50-406 figure.
15. Pack losses come from a 48 V pack (Arango, Lopez and Ceren, 2021) and the cold rows from McMaster University's LG HG2 cell, bracketed by Samsung's 35E data sheet and Casado et al., 2025.
16. The model's central rider, 62 lb, is the median child 3'5" to 5'0" tall in the 1975–1977 survey; the weight table runs from 38 lb to Eunorau's 200 lb.
17. The CPSC's own wording of the pediatric guidance was not located. The AAP and Nemours both attribute it to the Commission; we looked on its Micromobility Information Center, its electric-scooter page and its 2021 micromobility podcast transcript, and cpsc.gov refuses scripted reads, so the guidance is quoted as each publisher states it.
18. The 51-jurisdiction screen answers whether Eunorau's printed figures sit inside each definition, read from each state's code on August 21, 2026 and screened October 2; it does not test the class a state would give the bike.
19. The age rules were read two ways. The eight that reach this bike, and the dated changes in Illinois, Oregon and Utah, were re-read at their publishers on October 2, 2026; the other 43 jurisdictions' rules were read on August 19, 2026, and only Georgia's was re-read for this page, in its 2025 code and in HB 454 (2019) as signed. Hawaii's was read in Act 259 itself, because the state's compiled code still printed the 2019 text, and New Jersey's in the enacted act, through the Internet Archive's copy of August 22, 2026, when the Legislature's site refused the read.
20. City and county rules are not in the age table. A city can restrict where a child rides, and some do.
21. Recall status is a fact about a date. It was read October 2, 2026 after a term that must return rows returned 31 and a nonsense term returned none; the database's manufacturer-name field ignores its query and was not used.
22. UL certification is reported as Eunorau publishes it. The banner row says Yes; we did not obtain the certificate document, and will request it for any buyer who needs it.
23. This page has named expiry dates. It is re-read on January 1, 2027 (Illinois and Oregon), on May 5, 2027 (Utah), on any final rule in CPSC Docket No. CPSC-2024-0008, and on any change to Eunorau's specification.

The bottom line

The Eunorau EKIDS20 is a $809 pedal e-bike for a child 3'5" to 5'0" tall, and on Eunorau's own numbers that window holds 100.0% of US eight-year-olds on the CDC's stature chart. At the 22.4-inch lowest saddle, 87 of 100 measured eight-year-olds sit with both feet flat, and every child from 4'4" does.

It weighs 37.4 pounds, stops on two disc brakes that each cut the motor, and caps its speed at 7.5, 11 or 15.5 mph by a setting at the handlebar. One charge carries a 62 lb child about 37 miles at a steady 7.5 mph on level pavement in our model, and Eunorau's 20 miles at a steady 14.0 mph.

From 8 to 13 it fits the median child on the CDC chart for about five years, about $180 a year at $899, and Shop Pay splits the price into four interest-free payments of $224.75.

The law turns on where you live. Eunorau's figures sit inside 48 of 51 US e-bike definitions, and eight states set an age that reaches a bike like this one; New Jersey's is 15 and New York's and Pennsylvania's 16, so read the age table before you order.

Buy the EKIDS20 for a child of 8 or more who rides a pedal bike and stands 4'1" or taller. For a smaller child, the EKIDS16; for one near 5'0", the EKIDS24. And if you are between sizes, send us a height and an inseam and we will tell you which; if the answer is none of the three, our kids and teens guide carries picks across the brands we sell.

References and sources

59 entries from 59 distinct addresses. 30 are T1 — statutes, session laws, federal regulations, the Federal Register, federal surveys and first-party government data. 25 are T2 — the manufacturer's own published surfaces, our own records, two pediatric publishers' own guidance pages, a component maker's workbook and peer-reviewed measurements. 4 are T3 — the Compendium of Physical Activities, a tire-test laboratory, a thesis and a tire-sizing reference. Each was retrieved between September 11 and October 2, 2026.

No T5 source is cited. Every deposit path is in this page's citations.csv.

1. [T1] United States Code, 15 U.S.C. § 2085, "Low-speed electric bicycles", Government Publishing Office, read September 11, 2026. https://www.govinfo.gov/content/pkg/USCODE-2023-title15/html/USCODE-2023-title15-chap47-sec2085.htm
2. [T1] United States Code, 15 U.S.C. § 2052, "Definitions", Government Publishing Office, read September 11, 2026. https://www.govinfo.gov/content/pkg/USCODE-2023-title15/html/USCODE-2023-title15-chap47-sec2052.htm
3. [T1] 16 C.F.R. § 1512.2, "Definitions" — paragraph (a)(2), the bicycle with an electric motor, and paragraph (b), the sidewalk bicycle and how its seat height is measured, eCFR, read September 11, 2026. https://www.ecfr.gov/current/title-16/chapter-II/subchapter-C/part-1512
4. [T1] US Consumer Product Safety Commission, "Electric Bicycles; Advance Notice of Proposed Rulemaking; Request for Comments and Information", 89 Fed. Reg. 18861 (March 15, 2024), Docket No. CPSC-2024-0008, docket re-read through the Federal Register API October 2, 2026. https://www.federalregister.gov/documents/2024/03/15/2024-05472/electric-bicycles-advance-notice-of-proposed-rulemaking-request-for-comments-and-information
5. [T1] Centers for Disease Control and Prevention, 2000 CDC Growth Charts, stature-for-age, 2-20 years, data file, deposited September 11, 2026 and found identical to the Internet Archive copy on October 2, 2026. https://www.cdc.gov/growthcharts/data/zscore/statage.csv
6. [T1] US Consumer Product Safety Commission, SaferProducts.gov recall search — eight e-bike title terms returning 51 distinct federal recalls, and "Eunorau" and "EKIDS" queried as title terms, with "Eunorau" in the description and product-name fields, read October 2, 2026. https://www.saferproducts.gov/PublicSearch
7. [T1] US Consumer Product Safety Commission, product safety warning listing (complete CSV), 373 warnings, read October 2, 2026; deposit copy archived. https://www.cpsc.gov/s3fs-public/recall-data/product_safety_warning_listing.csv
8. [T1] New Jersey Legislature, P.L.2025, c.285, amending R.S. 39:1-1 ("Low-speed electric bicycle", "Motorized bicycle") and C.39:4-14.3, approved January 19, 2026, read October 2, 2026 through the Internet Archive capture of August 22, 2026; enacted text also on file from August 15, 2026. https://pub.njleg.gov/Bills/2024/PL25/285_.HTM
9. [T1] Alaska Statutes § 28.90.990, "Definitions for title", Alaska State Legislature, print view, read September 12, 2026. https://www.akleg.gov/basis/statutes.asp?media=print&secStart=28.90.990&secEnd=28.90.990
10. [T1] Alaska State Legislature, House Bill 8 (33rd Legislature), bill detail and status "VETOED BY GOVERNOR", July 20, 2023, read September 11, 2026. https://www.akleg.gov/basis/Bill/Detail/33?Root=HB%208
11. [T1] Kentucky Revised Statutes § 189.010, "Definitions for chapter", effective July 15, 2026, subsection (26), Kentucky General Assembly, read October 2, 2026. https://apps.legislature.ky.gov/law/statutes/statute.aspx?id=57661
12. [T1] Kentucky Revised Statutes § 189.289(1), Kentucky General Assembly, read October 2, 2026. https://apps.legislature.ky.gov/law/statutes/statute.aspx?id=48629
13. [T1] Arizona Revised Statutes § 28-101(28), the Class 1, Class 2 and Class 3 definitions, Arizona State Legislature, read October 2, 2026. https://www.azleg.gov/ars/28/00101.htm
14. [T1] Hawaii State Legislature, Act 259 (2026), HB 2021 CD1 — § 5 (the class definitions in HRS § 291C-1), § 12 (HRS § 291C-143.5, operator age and "direct supervision") and § 22 (effective upon approval), approved July 15, 2026, read October 2, 2026. https://www.capitol.hawaii.gov/sessions/session2026/bills/HB2021_CD1_.HTM
15. [T1] Maine Revised Statutes, Title 29-A § 2063(14)(H), age restrictions for electric bicycles, Maine Legislature, read October 2, 2026. https://legislature.maine.gov/statutes/29-A/title29-Asec2063.html
16. [T1] Maine Revised Statutes, Title 29-A § 101(22-B), "Electric bicycle" and its three classes, Maine Legislature, read October 2, 2026. https://legislature.maine.gov/statutes/29-A/title29-Asec101.html
17. [T1] Minnesota Statutes § 169.222, subdivision 6a(e), Office of the Revisor of Statutes, read October 2, 2026. https://www.revisor.mn.gov/statutes/cite/169.222
18. [T1] New York Vehicle and Traffic Law § 1242(2), New York State Senate, read October 2, 2026 in a rendered browser. https://www.nysenate.gov/legislation/laws/VAT/1242
19. [T1] Oregon Revised Statutes § 807.020(15), the text in force through December 31, 2026, Oregon Legislative Assembly, read October 2, 2026. https://www.oregonlegislature.gov/bills_laws/ors/ors807.html
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24. [T1] Illinois General Assembly, SB 3484 (104th General Assembly), enrolled text amending 625 ILCS 5/11-1517(h), Public Act 104-0854, approved August 26, 2026, effective January 1, 2027, text and bill status read October 2, 2026. https://www.ilga.gov/legislation/104/SB/10400SB3484enr.htm
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33. [T2] EUNORAU, "We are UL 2849 tested and UL 2271 tested!", company post, March 5, 2023, read September 11, 2026. https://eunorau-ebike.com/blogs/news/we-are-ul-2849-tested-and-ul-2271-tested
34. [T2] EUNORAU, "24-Month+ Limited Warranty" — 10 years on the frame, 24 months on the battery, motor and electrical components, read October 2, 2026. https://eunorau-ebike.com/pages/warranty
35. [T2] EUNORAU, "EUNORAU EBIKES FAQ" — the 10-15% recharging advice and the 10℃ to 55℃ battery operating range, read September 26 and 30, 2026; deposit copies archived. https://eunorau-ebike.com/pages/faqs
36. [T2] Redtail eBikes, Eunorau EKIDS20 product record, both colorways in stock, and its Shop Pay terms, read October 2, 2026. https://redtailebikes.com/products/eunorau-ekids-20
37. [T2] Redtail eBikes, first-party instruments held with this page — the 51-jurisdiction definition screen, the youth age-floor census and its October 2 re-read of eight states, the youth fit model and the CDC age computation, the range model, the recall and warning screens and the AI answer panel, all of October 2, 2026. https://redtailebikes.com/blogs/journal/eunorau-ekids20-review
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52. [T2] American Academy of Pediatrics, HealthyChildren.org, Phyllis Agran, MD, FAAP, "Are Electric Bikes (E-Bikes) Safe for Children?", last updated August 21, 2026, read October 2, 2026; deposit archived. https://www.healthychildren.org/English/tips-tools/ask-the-pediatrician/Pages/are-electric-bikes-e-bikes-safe-for-children.aspx
53. [T2] Nemours KidsHealth, "Are E-Bikes Safe?", medically reviewed by Michael J. Stoner, MD, July 2025, read October 2, 2026; deposit archived. https://kidshealth.org/en/parents/ebike-safe.html
54. [T3] 2024 Adult Compendium of Physical Activities, "Running", the 7.5, 11 and 14 mph rows, read September 13, 2026. https://pacompendium.com/running/
55. [T3] Bicycle Rolling Resistance, fat-bike tire tests — the knobby casings measured on the drum, read September 25, 2026; deposit copy archived. https://www.bicyclerollingresistance.com/fat-bike-reviews
56. [T3] Carahalios, A., An Analysis of the Bicycle-Rider Interface Forces in Stationary Road Cycling, MS thesis, University of Colorado (2015), read September 25, 2026. https://scholar.colorado.edu/downloads/70795789x
57. [T3] Sheldon Brown and John Allen (Harris Cyclery), "Tire Sizing Systems", the ISO/E.T.R.T.O. chart: "20 x 1.5-20 x 2.125 | 406 mm", read September 28, 2026; deposit copy archived. https://www.sheldonbrown.com/tire-sizing.html
58. [T2] EUNORAU, EKIDS-16 product page — "Weight: 28.6 lbs" and "Recommended Rider Heights: 3'0" ~ 4'5"", read October 2, 2026. https://eunorau-ebike.com/products/ekids-16
59. [T2] EUNORAU, EKIDS-24 product page — "Weight: 44.1lbs", "Recommended Rider Heights: 3'5" ~ 5'5"" and "Fork: 50mm travel Suspension Fork", read October 2, 2026. https://eunorau-ebike.com/products/ekids-24