Retro-Styled Kids Electric Bike for Ages 8-12
HKM-922835 Kids Electric Bike
The HKM-922835 is a properly specified electric bike scaled down for riders aged roughly 8 to 12. A 350 W brushless rear hub motor and a 36 V 15 Ah lithium pack (540 Wh) deliver 18.6-24.9 mi of range, which is a great deal more than a child will use in an afternoon. The feature that matters most to parents is the adjustable speed limiter: top speed can be set anywhere from 9.3 mph up to 15.5 mph, so the bike grows with a rider instead of being outgrown. Mechanical disc brakes at both ends, a telescopic front fork, 16 in pneumatic tires, an IPX4 water- resistant build, and a carbon steel frame rated to 220 lb make up the rest of a bike designed to be ridden hard and often.
350 W Brushless Rear Hub36 V 15 Ah / 540 Wh Pack9.3-15.5 mph Adjustable18.6-24.9 mi Range16 in Pneumatic TiresFront Suspension ForkIPX4 Water ResistantAges 8-12, 220 lb Load
Motor
350 W
36 V brushless rear hub
Battery
36 V 15 Ah
540 Wh lithium-ion with BMS
Top Speed
9.3-15.5 mph
15-25 km/h, parent adjustable
Range
18.6-24.9 mi
30-40 km per charge
Wheels
16 in
Pneumatic tires, sidewalk and path
Load Capacity
220 lb
100 kg, room to grow
Overview
Most electric bikes sold for children are either underpowered toys with sealed lead batteries or scaled-down adult bikes that are simply too big to control. The HKM-922835 sits between the two. The 16 in wheels and the compact carbon steel frame put the saddle and the bars where an 8 to 12 year old can reach them comfortably, while the components underneath - a brushless motor, a lithium pack with a proper battery management system, disc brakes, and a suspension fork - are the same kinds of parts fitted to adult machines.
The adjustable speed limiter is the single most useful feature on the bike. Top speed can be set anywhere between 9.3 mph (15 km/h) and 15.5 mph (25 km/h). A cautious first setting lets a new rider learn throttle control, braking distance, and cornering at a pace where mistakes are cheap. As confidence and skill build, the limit can be raised. In practice this means one bike covers several years of development rather than being outgrown in a single season.
Range is generous relative to how children actually ride. The 36 V 15 Ah pack stores 540 Wh and delivers 18.6-24.9 mi (30-40 km) per charge depending on rider weight, terrain, and the speed setting. Since a typical afternoon of riding around a neighbourhood or a park covers a small fraction of that, the realistic pattern is charging once or twice a week rather than every night. A full charge takes 5-8 hours, so an overnight top-up is straightforward.
The chassis is built for the reality of how children ride: over curbs, through puddles, and occasionally onto the ground. The high-strength carbon steel frame is rated to 220 lb (100 kg), far beyond what a child in this age band weighs, which means the margin is there for hard use and for a growing rider. IPX4 sealing across the motor, battery, and controller, along with a gasketed battery compartment, means light rain and wet grass are not a problem.
Key Features
350 W Brushless Rear Hub Motor
A brushless motor has no carbon brushes to wear out and no commutator to service, which is why it runs quietly and needs essentially no maintenance over the life of the bike. At 350 W it has enough torque for moderate hills and grass without being sharp enough to surprise a young rider. Mounting it in the rear wheel puts weight over the driven wheel, which helps traction on loose surfaces.
36 V 15 Ah Lithium-Ion Pack (540 Wh)
A 15 amp-hour pack is a large battery for a bike this size, which is why range lands at 18.6-24.9 mi rather than the single-digit figures common on kids electric bikes. The battery management system protects against overcharge, over-discharge, short circuit, and overheating. A full charge takes 5-8 hours with the supplied charger.
Telescopic Front Suspension Fork
The front fork compresses to absorb cracked sidewalks, curb transitions, tree roots, and the kind of terrain children seek out on purpose. Beyond comfort, suspension keeps the front tire in contact with the ground over bumps, which makes steering more predictable at exactly the moment a young rider needs it to be.
Mechanical Disc Brakes, Front and Rear
Disc brakes sit away from the road surface, so they shed water quickly and keep working in wet conditions where rim brakes lose much of their bite. Stopping distances are shorter and more consistent than rim brakes deliver. The levers are sized for smaller hands and have reach adjustment, so a child can wrap their fingers properly around them.
Adjustable Speed Limiter, 9.3 to 15.5 mph
Top speed is set through the controller and can be capped anywhere from 9.3 mph (15 km/h) to 15.5 mph (25 km/h). Start a new rider at the lower limit while they learn braking distance and cornering, then raise it in steps as their judgement develops. It is the feature that lets one bike serve a rider from eight to twelve.
16 in Pneumatic Tires
Air-filled 16 in tires give a considerably better ride than the solid tires fitted to cheaper childrens bikes, absorbing small bumps and gripping properly on loose gravel and damp pavement. The 16 in diameter keeps the standover height low so a child can put both feet flat on the ground when stopped.
Retro Styling with Candy-Colour Finish
Classic bicycle lines, a rounded tank profile, and a candy-coloured finish give the bike a look closer to a small vintage motorcycle than to a plastic toy. This matters more than it sounds: children ride the bike they are proud to be seen on, and a bike that gets ridden is a bike that builds skill.
Twist Throttle Plus Selectable Pedal Assist
The bike can be ridden as a pure twist-and-go machine or with pedal assist, where the motor supplements pedalling. Starting on assist keeps a new rider engaged with the pedals and the balance of the bike; switching to throttle later gives them the freedom to cruise. Both modes are available at any speed-limiter setting.
Full Specifications
Model
HKM-922835 | Kids Electric Retro Bike
Frame Material
High-strength carbon steel, compact retro geometry
Motor
350 W brushless rear hub motor
System Voltage
36 V DC
Battery
36 V 15 Ah lithium-ion (540 Wh) with battery management system
Charger
Smart charger, 100-240 V input
Charging Time
5-8 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
9.3-15.5 mph (15-25 km/h), adjustable via speed limiter
Range Per Charge
18.6-24.9 mi (30-40 km), varies with rider weight, terrain, and speed setting
Climbing Grade
Moderate inclines with a rider within the recommended age and weight band
Drive Type
Rear-wheel hub drive, no chain-driven motor path
Riding Modes
Twist throttle, selectable pedal assist, and manual pedalling
Brakes
Mechanical disc brakes front and rear, reach-adjustable levers
Suspension
Telescopic front suspension fork
Tires
16 in (40.6 cm) pneumatic tires
Wheels
16 in rims with spoked construction
Saddle
Padded retro saddle, height adjustable via seat post
Display
Handlebar readout showing speed, battery level, and assist mode
Throttle
Twist-grip throttle with selectable pedal-assist levels
Water Resistance
IPX4 rated: motor, battery, controller, and sealed connectors
Load Capacity
220 lb (100 kg) maximum rider weight
Recommended Age
8 to 12 years, with adult supervision
Standover
Low standover height; a rider should reach the ground with both feet
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 36 V 15 Ah pack holds 540 Wh, which is a large battery in the context of a 16 in kids bike. Many bikes in this category ship with 150-250 Wh, so range here is roughly double what is typical. In practice that means the bike is charged once or twice a week rather than after every ride, which removes a small daily chore and, more importantly, removes the disappointment of a flat battery halfway through an afternoon.
Real-world range lands between 18.6 and 24.9 mi (30-40 km). Lighter riders on flat pavement at the lower speed-limiter setting see the upper end of that band; heavier riders on grass and hills at the higher setting see the lower end. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent, and it returns once the pack warms back up.
Tip: Charging is a job for an adult. Use only the supplied charger, charge indoors at room temperature on a hard non-flammable surface, and unplug once the indicator turns green. Do not leave a pack charging unattended overnight.
The battery management system protects the pack against overcharge, over-discharge, short circuit, and temperature extremes, so ordinary use will not damage it. If the bike is being stored for the winter, leave the pack at roughly half charge, keep it somewhere dry and above freezing, and top it up every 4-6 weeks.
Daily Use & Care
- Check tire pressure weekly against the figure printed on the sidewall. Soft tires cost range and make the steering feel vague, which matters more for a light rider.
- Set the saddle height so the child can touch the ground with both feet flat while seated, and raise it as they grow.
- Test both brake levers before each ride and adjust the cable barrel adjusters as the pads wear so the levers do not pull back to the grip.
- Rinse mud and grass off the frame and rotors after wet rides and dry the bike; the steel frame will rust wherever the paint is chipped.
- Check that the wheel nuts, stem bolts, and seat post clamp are tight at the start of each week.
- Wipe and re-lubricate the chain every few weeks, and after any ride through water or sand.
- Store the bike indoors or under cover. IPX4 handles rain while riding but is not a substitute for shelter.
What's in the Box
- 1 x HKM-922835 kids electric retro bike, partially pre-assembled
- 1 x 36 V 15 Ah lithium battery pack
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Assembly toolkit with hex wrenches and pedal spanner
- 1 x Pair of pedals
- 1 x Set of training decals and reflectors
- 1 x User manual and parent setup guide
Frequently Asked Questions
What age and size is this bike suitable for?+
It is designed for riders aged roughly 8 to 12, with a maximum rider weight of 220 lb (100 kg). Age is a rough guide; the practical test is whether the child can sit on the saddle and put both feet flat on the ground, reach and squeeze both brake levers comfortably, and hold the bike upright when stopped.
How does the speed limiter work?+
Top speed is set in the controller and can be capped anywhere between 9.3 mph (15 km/h) and 15.5 mph (25 km/h). The setup guide covers how to change it. Start a new rider at the lowest setting and raise it in steps as they demonstrate consistent braking and cornering. The setting is not something a child can change while riding.
What is the real-world battery range?+
Between 18.6 and 24.9 mi (30-40 km) on a full charge. Lighter riders on flat ground at lower speed settings reach the upper end. Since most children cover only a few miles in an afternoon, the bike typically needs charging once or twice a week.
Can it be ridden in the rain?+
The IPX4 rating covers splashes and light rain, and the battery compartment has a rubber gasket. Riding through puddles is fine; submerging any part of the bike is not. Dry the bike afterwards and store it under cover.
How long does charging take?+
Five to eight hours from empty with the supplied charger. Charging should be supervised by an adult, done indoors at room temperature on a non-flammable surface, and unplugged once the indicator turns green.
Can the child pedal it like a normal bike?+
Yes. The bike can be ridden with the motor off, on pedal assist where the motor supplements pedalling, or on pure throttle. Many parents start with pedal assist so the child stays engaged with pedalling and balance, then allow throttle use later.
Where is it legal to ride?+
Rules for electric bikes ridden by minors vary widely by state and city, and many jurisdictions set a minimum age or restrict throttle use on public roads and paths. Private property and supervised areas are always the safer starting point. Check your local ordinances before riding on public roads, sidewalks, or bike paths.
How much assembly is required?+
The bike arrives partially assembled. Expect to fit the handlebars, front wheel, pedals, and saddle, then set the saddle height and check the brakes. Budget 30-45 minutes with the supplied tools. Because a child will be riding it, verify brake function and wheel nut torque carefully before handing it over.
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CERoHSUN38.3 BatteryIPX4 Rated540 Wh PackAdjustable Speed LimiterAges 8-12
Why Choose the HKM-922835
One Bike That Grows With the Rider
The adjustable speed limiter, the adjustable saddle height, and a 220 lb weight rating mean the bike suits a cautious eight year old and a confident twelve year old equally. Rather than buying a slow bike now and a faster one in two years, you change a setting.
Real Components, Scaled Down
A brushless hub motor, a lithium pack with a proper BMS, mechanical disc brakes, and a telescopic suspension fork are adult-grade choices. Fitting them to a 16 in frame gives a child a bike that behaves predictably instead of one that behaves like a toy.
Parents Set the Limits
Top speed is controlled by the adult, not by the rider. That single design decision changes the conversation from whether the child can be trusted with the bike to how quickly they earn the next increment of speed.
Quiet Enough to Ride Anywhere
The brushless motor produces a low hum rather than the whine of a brushed motor or the noise of a combustion engine. Early morning rides and quiet neighbourhoods stay quiet, and the child can hear traffic and voices around them clearly.
Charge Once, Ride All Week
At 540 Wh the pack carries roughly double the energy of a typical kids electric bike. A few afternoons of neighbourhood riding barely dents it, so charging becomes a weekly task instead of a nightly one.
Made for Puddles and Wet Grass
IPX4 sealing on the motor, battery, and controller, sealed connectors, and a gasketed battery compartment mean a wet lawn or an unexpected shower does not end the ride or damage the bike.
Controls & Indicators
Power Button
Switches the system on and off; an adult can keep the key to prevent unsupervised use
Mode Buttons
Select pedal-assist level or switch to zero assist for manual pedalling
Twist Throttle
Right-hand grip; proportional response capped by the speed limiter setting
Speedometer
Live speed readout on the handlebar display, switchable between mph and km/h
Battery Gauge
Charge indicator on the display so a child can see when to bring the bike home
Reflectors
Front, rear, wheel, and pedal reflectors fitted for daylight and low-light visibility
Speed Limiter Setting
Parent-set maximum speed between 9.3 mph and 15.5 mph, changed through the controller menu
Pre-Ride Safety Checklist
- Confirm the saddle is at a height where the child can put both feet flat on the ground while seated.
- Check tire pressure against the sidewall figure; soft tires make the steering feel vague for a light rider.
- Squeeze both brake levers and confirm they bite well before reaching the grip, and that the child can reach them comfortably.
- Check the speed limiter is set to the level appropriate for the rider and the location before handing the bike over.
- Confirm the battery is seated and locked and that the display shows the state of charge you expect.
- Check that the wheel nuts, stem bolts, and seat post clamp are tight.
- Fit a correctly sized helmet on every ride, and add gloves and knee pads for a new rider.
- Agree the boundaries of where the child may ride before they set off, and supervise new riders directly.
Quick Troubleshooting
The motor does not run when the throttle is twisted.+
Check that the display is on and showing charge, that the battery is seated and locked, and that both brake levers are fully released, since the cut-off switches disable the motor while a lever is pulled. If an error code appears, note it before contacting support.
The bike will not go as fast as it used to.+
Check the speed limiter setting first, since it is the most common explanation and is easy to change accidentally. After that, check tire pressure and battery charge level, both of which reduce top speed noticeably when low.
The brakes rub, or the lever pulls back to the grip.+
Mechanical disc brakes need occasional cable adjustment as the pads wear. Turn the barrel adjuster out a quarter turn at a time until the lever bites earlier. If the rotor rubs constantly, the caliper needs centring over the disc.
Range has dropped noticeably.+
Soft tires are the usual cause, followed by cold weather, which temporarily reduces capacity and returns to normal as the pack warms. A heavier rider or a higher speed setting than before will also lower range legitimately.
The chain has come off.+
Refit it over the sprockets by hand with the bike inverted or on a stand, then check chain tension. If it keeps happening, tension is too loose or the rear wheel has shifted slightly in the dropouts and needs realigning.
The display shows an error code and the bike will not move.+
Switch the system off, wait 30 seconds, and switch it back on. If the code returns, write down the exact code and what the child was doing at the time, then contact support - codes map to specific faults in the controller, motor, throttle, or battery circuits.
Certifications & Standards
The HKM-922835 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and the assembled pack carry the test documentation normally required for lithium-ion transport and sale, and the electrical assembly is rated IPX4 against splashing water.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- IPX4 - Protection against splashing water from any direction, covering motor, battery, and controller.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is an electric vehicle intended for children aged approximately 8 to 12 and it requires adult supervision. Set the speed limiter to the lowest setting for a new rider, choose a traffic-free area for the first sessions, and raise the limit only as the child demonstrates consistent braking, steering, and awareness. An adult should handle charging, assembly, and all maintenance.
- A correctly fitted helmet is required on every ride. Gloves, knee pads, and elbow pads are strongly recommended for new riders.
- Set the speed limiter to match the rider skill level and the location. Start at 9.3 mph (15 km/h) and increase in steps.
- Supervise all riding. Children should not ride in traffic, on busy roads, or after dark.
- Do not exceed the 220 lb (100 kg) maximum rider weight, and do not carry a passenger - this is a single-rider bike.
- Check local law before riding on public roads, sidewalks, or bike paths. Many jurisdictions set a minimum age or restrict throttle use by minors.
- Charging must be done by an adult, indoors, at room temperature, on a non-flammable surface, with the supplied charger only. Never leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack, and keep it out of reach of younger children.
- The IPX4 rating covers rain and splashes, not submersion. Do not ride through water deep enough to reach the motor or the battery compartment.
HKM-922835 · 350 W brushless rear hub motor · 36 V 15 Ah lithium (540 Wh) · adjustable 9.3-15.5 mph (15-25 km/h) top speed · 18.6-24.9 mi (30-40 km) range · 16 in pneumatic tires · telescopic front suspension fork · mechanical disc brakes front and rear · IPX4 water resistant · high-strength carbon steel frame · 220 lb (100 kg) maximum rider weight · recommended for ages 8-12 with adult supervision. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and speed-limiter setting. This page describes the product only and is not legal advice regarding vehicle classification or minimum rider age - confirm local regulations before riding on public roads or paths.
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