16 in Electric City Bike Built for Young Riders
HKM-5809875 Electric City Bike for Kids
The HKM-5809875 is a 16 in electric city bike made for children who are learning to ride. A 350 W brushless rear hub motor adds gentle assist on flats and small hills, while a 36 V 15 Ah lithium pack (540 Wh) in the down tube keeps the weight low and the center of gravity near the ground. The lightweight steel frame has a low stand height so kids can put a foot down at a stop, and a single-speed drivetrain means there is no derailleur to snag or mistime. A twist throttle gives controllable acceleration, disc braking brings it to a calm stop, and a bright LED headlight makes after-school rides safer as the light fades.
350 W Brushless Motor36 V 15 Ah / 540 Wh PackUp to 18 mph Top Speed16 in WheelsDisc BrakesSingle-Speed265 lb Load CapacityLightweight 55 lb Frame
Motor
350 W
brushless rear hub
Battery
36 V 15 Ah
540 Wh lithium
Top Speed
Up to 18 mph
29 km/h, throttle only
Range
6-19 mi
10-30 km per charge
Wheels
16 in
city and light-trail tread
Bike Weight
55 lb
25 kg steel frame
Overview
The HKM-5809875 is built around a small, low-step steel frame sized for children. The top tube sits well below saddle height so a young rider can flat-foot the ground at a stop light or curb without swinging a leg over a tall frame. The frame is rated for a total load of 265 lb, which covers a growing child plus a backpack or a small cargo load on the rear carrier.
Under the styling is a simple, durable electric drivetrain: a 350 W brushless rear hub motor that adds smooth assist, fed by a 36 V 15 Ah lithium pack storing about 540 Wh of energy. The twist throttle gives immediate, easy-to-modulate acceleration, and the single-speed chain means there is nothing to shift - the rider just pedals and twists.
Real-world range is modest by design. On flat pavement at a relaxed pace a child can ride 10-30 km (6-19 mi) from a full charge. Because the motor is gentle and the pack is small, the bike stays light at about 55 lb, which matters when a kid is walking it back to the garage or a parent is lifting it onto a rack.
Comfort and control match the rider. A 16 in wheel keeps the bike low and easy to balance, a disc brake gives predictable stopping with a small hand-lever pull, and the wide saddle and upright bar put the child in a confident, heads-up position. An LED headlight runs off the main pack so evening rides stay visible.
Key Features
350 W Brushless Rear Hub Motor
A 350 W brushless motor is laced into the rear wheel hub. There is no chain or belt between the motor and the ground, so drive losses stay low and there is little to maintain. Output is tuned gently for a young rider: enough to assist on small hills and starts from a stop, never so much that the bike feels twitchy in the hands of a beginner.
36 V 15 Ah Lithium Pack (540 Wh)
The pack sits in the down tube behind a cover and lifts out with a key for indoor charging. 540 Wh is enough for many short neighborhood rides between charges. A full recharge from empty takes about 4-6 hours on the supplied charger; partial top-ups take proportionally less.
Rigid Beginner Frame
The frame is rigid with no suspension, which keeps the bike light, the price sensible, and the standover height low - exactly what a learning rider needs. The 16 in tires add a little cushion on pavement and packed trail, and the simple layout means fewer parts to adjust or break.
Disc Brake with Child-Sized Lever
A disc brake at the rear wheel gives steady, predictable stopping with a light pull suited to small hands. Power-off behavior cuts motor drive the instant the lever is pulled, so a child who grabs the brake stops the assist immediately - a calm, safe way to slow down.
Single-Speed Drivetrain
A single-speed chain with a freewheel means there is no derailleur to shift or mistime. The rider pedals, and the twist throttle adds motor assist when wanted. Fewer moving parts means fewer things to go wrong on a bike that gets leaned on fences and tossed in the garage.
16 in City and Light-Trail Tires
The 16 in wheels keep the bike low and easy to balance for shorter riders. The tires carry enough tread for packed dirt paths and park shortcuts while still rolling quietly on pavement, so the bike is happy cruising the neighborhood or exploring a gentle trail.
LED Headlight
A bright LED headlight runs off the main pack, so there are no separate batteries to keep charged. It adds visibility from the front during after-school rides and at dusk, when a small bike is easiest to lose sight of in traffic.
Rear Carrier and Kickstand
A simple rear carrier carries a backpack or a small load, and a side kickstand lets the bike stand on its own in the driveway. Together they make the HKM-5809875 a practical little runabout for school runs and park loops rather than a toy that has to be laid on the grass.
Full Specifications
Model
HKM-5809875 | Electric City Bike for Kids
Frame Material
Lightweight steel, low-step kids geometry
Motor
350 W brushless rear hub motor
System Voltage
36 V DC
Battery
36 V 15 Ah lithium-ion (540 Wh), removable and lockable
Charger
2 A smart charger, 100-240 V input
Charging Time
4-6 hours from empty
Battery Cycle Life
Approximately 500 charge cycles to 80 percent capacity
Top Speed
Up to 18 mph (29 km/h)
Range Per Charge
6-19 mi (10-30 km), varies with terrain and rider weight
Climbing Grade
Up to approximately 12 degrees with a child rider
Peak Torque
Up to 45 N.m (estimated for this motor class)
Drivetrain
Single-speed chain with twist throttle and pedal assist
Brakes
Mechanical disc brake with child-sized lever and power-off cut
Suspension
Rigid frame, no suspension (beginner geometry)
Tires
16 in city and light-trail tires
Wheels
16 in steel rims, stainless spokes
Saddle
Kid-sized saddle with tool-free height adjustment
Display
Simple battery-level indicator
Throttle
Twist-grip throttle with pedal-assist mode
Lighting
LED headlight, powered by main battery
Load Capacity
265 lb (120 kg) rider and cargo
Bike Weight
Approximately 55 lb (25 kg) including battery
Recommended Rider Height
3 ft 8 in to 4 ft 10 in (112-147 cm)
Certifications
CE documentation available; battery cells UN38.3 tested
Battery, Range, and Charging
The 36 V 15 Ah pack stores 540 Wh of energy. That is a modest budget on purpose: it keeps the bike light and the range appropriate for the short rides a child actually does - loops around the block, the trip to a friend down the street, a gentle park path. For a young rider the important number is not maximum range but how easy the bike is to handle and charge.
Real-world range depends mostly on how much the child pedals, the terrain, and rider weight. Relaxed pedaling with light assist on flat pavement lands in the 10-30 km band. More throttle and more hills pull that down; calm riding on level ground extends it. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent and returns once the pack warms up.
Tip: Remove the pack and charge it indoors at room temperature, and unplug the charger once the indicator turns green rather than leaving it connected for days. Store the bike with the pack between 30 and 70 percent charge if it will sit unused for more than a month.
The pack unlocks with the supplied key and lifts out of the down tube in a few seconds, so it can charge on a bench while the bike stays locked outside. Two keys are included. Charging with the pack installed works equally well through the frame-side charge port.
Daily Use & Care
- Keep tire pressure in the recommended range for the 16 in tires; a firmer tire rolls easier on pavement, a slightly softer one grips better on dirt.
- Wipe the frame and rims with a damp cloth after riding on wet grass or dusty paths so road film does not sit on the steel fasteners.
- Check that the axle nuts and stem bolt are snug before the first ride of each week; a kid bike gets bounced around more than most.
- Re-lubricate the chain every 100 mi or after any ride through standing water or dust.
- Inspect the brake pad and the rotor monthly; replace the pad when the friction material is thin so stopping stays predictable.
- Charge indoors at room temperature and unplug once the light turns green; do not leave a charging pack unattended overnight.
- Keep the charge port cover closed when the bike is parked outside so moisture stays out of the connector.
What's in the Box
- 1 x HKM-5809875 electric city bike for kids, approximately 85 percent pre-assembled
- 1 x 36 V 15 Ah removable lithium battery pack
- 1 x 2 A smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of pedals
- 1 x Rear carrier (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
Is this bike safe for a beginner child?+
The HKM-5809875 is built for learning riders: a low standover frame, a gentle 350 W motor capped near 18 mph, a single-speed drivetrain with nothing to shift, and a disc brake with a small hand lever. Always supervise early rides, keep the speed low, and have the child wear a certified helmet sized for them.
How much assembly is required out of the box?+
The bike ships approximately 85 percent assembled. Remaining steps are fitting the front wheel, straightening and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 30-45 minutes with the supplied tools, or have a bike shop finish the setup if you are not comfortable doing it yourself.
What is the actual range I should plan for?+
Plan for 6-19 mi (10-30 km) depending on how much the child pedals. More throttle and more hills reduce range; calm pedaling on level pavement extends it. Cold weather also temporarily trims available capacity.
Is a license or registration required?+
Rules vary by state and locality. A 350 W motor capped near 18 mph is within the three-class e-bike framework in many US areas for bike-path use, but check your state DMV and local ordinances before riding on public roads or paths, and note that a rider must be old enough under local law.
How long does the battery take to charge?+
About 4-6 hours from fully empty with the supplied 2 A charger. Partial top-ups take proportionally less time; there is no need to run the pack down before recharging.
Can my child pedal it if the battery runs out?+
Yes. The single-speed chain works independently of the motor, so the bike can be pedaled home unassisted. It is heavier than a normal kid bike at about 55 lb, so an adult may need to help on the way back.
Will the brake handle the speed?+
A disc brake with a power-off cut is the right specification for a bike capped near 18 mph. Bed the pad in with a few gentle stops from low speed during the first rides, and have the child practice stopping in an open area before riding near others.
Is the battery removable for indoor charging?+
Yes. It unlocks with the supplied key and lifts out of the down tube. You can also charge it in place through the frame-side charge port.
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The product is covered by a 24-month warranty from the delivery date against manufacturing defects. Coverage includes parts and labor; normal-wear items are excluded.
CEUN38.3 Battery540 Wh PackDisc BrakeSingle-SpeedLow-Step FrameLED Headlight
Why Choose the HKM-5809875
Sized and Tuned for Young Riders
A low-step frame, a gentle 350 W motor capped near 18 mph, and a single-speed drivetrain make this a bike a child can learn on rather than fight with. The rider sits upright and heads-up, which builds confidence fast on the first few rides.
Handles the Park and the Pavement
The 16 in wheels and light-trail tread roll quietly on pavement and still cope with packed dirt paths and park shortcuts. It is not a mountain bike, but it is happy exploring beyond the sidewalk.
Two Ways to Ride
Pedal like a normal bike, or twist the throttle for a calm assist on starts and small hills. Most kids mix both - pedaling to learn the feel, throttle when they want a little help keeping up.
Quiet, Low-Maintenance Hub Motor
The motor lives in the rear hub with no mid-drive gearbox or extra chain to service. Fewer moving parts in the drive path means less to maintain and a notably quiet ride that does not startle a nervous beginner.
Low Standover for Shorter Riders
The small wheel size and dropped top tube lower standover height so most kids can put both feet down at a stop. Combined with the recommended height range of 3 ft 8 in to 4 ft 10 in, the bike fits a growing child for several seasons.
Built for Real Kid Use
Sealed electrical connectors, a covered battery compartment, and a kickstand that keeps the bike upright all suit a bike that gets leaned on fences, rained on, and left in the garage. It is made to be ridden, not babied.
Controls & Indicators
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Button
Cycles the assist level on the indicator
Twist Throttle
Right-hand grip; smooth, progressive response for a young rider
Speedometer
Live speed readout in mph on the indicator
Battery Gauge
Battery-level indicator on the handlebar
Light Switch
Toggles the LED headlight
Brake Lever
Rear disc brake lever with power-off cut
Pre-Ride Safety Checklist
- Check tire pressure and set it for the surface: firmer for pavement, a touch softer for dirt.
- Squeeze the brake lever. It should firm up well before reaching the grip, with no sponginess.
- Confirm the battery is seated and locked, and that the indicator shows the expected state of charge.
- Spin both wheels and check that the rims run true and nothing rubs the brake or the frame.
- Verify the axle nuts and stem bolt are tight, and that the headset has no play.
- Test the throttle at walking pace in a clear area before riding near others.
- Switch on the headlight if riding near dusk, and fit a certified helmet sized for the child.
- Remind the rider of the local speed and path rules before setting off.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the indicator is on and shows charge, the battery is locked into place, and the brake lever is fully released - the power-off sensor disables the motor while the lever is pulled. If an error code appears, note it and contact support.
Range dropped noticeably compared with when it was new.+
First check tire pressure; a soft tire is the most common cause. Then consider temperature - cold reduces available capacity temporarily. If range is down more than 30 percent year-round after many cycles, the pack may be reaching the end of its service life.
The brake feels soft at the lever.+
A mechanical disc system should feel firm. If the lever pulls close to the grip, the pad may be worn or the rotor out of true. Stop and inspect; have a shop adjust it before the child rides again.
The chain skips or comes off.+
The single-speed chain is simple but can derail if the wheel is not seated. Re-seat the wheel in the dropouts and check chain tension. If it skips only under hard pedaling, the freewheel may be worn.
The front wheel is loose or rattles.+
Check that the axle nuts are tight and the wheel is seated in the dropouts. If a rattle persists over bumps, the wheel may need truing or the bearings checked by a shop.
The indicator shows an error code and the bike will not move.+
Power the system off, wait 30 seconds, and switch it back on. If the code returns, note the exact code and the conditions, then contact support - error codes map to specific faults in the controller or throttle circuits.
Certifications & Standards
The HKM-5809875 is produced in a facility operating under a quality management system. The battery cells and the assembled pack carry the test documentation normally required for lithium-ion transport and sale. CE documentation is available on request.
- CE - European Conformity documentation available for the electrical assembly.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- MSDS - Material Safety Data Sheet available for the battery pack on request.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is an electric bicycle capable of about 18 mph. An adult should supervise the first rides and practice throttle control with the child in an open, traffic-free area until the response feels predictable. Always fit a certified helmet sized for the rider before the first ride.
- Always supervise young riders and keep them on suitable paths away from traffic until they are confident.
- Do not exceed the 265 lb (120 kg) load capacity, which includes the rider and any cargo.
- Check local law before riding on public roads or paths; confirm the rider meets the minimum age and the bike fits local e-bike classes.
- Bed in the brake with a few gentle stops during the first rides before riding at full speed near others.
- Do not ride through water deep enough to reach the hub motor or the battery compartment.
- Charge only with the supplied charger, indoors, at room temperature, and on a non-flammable surface. Do not leave a charging battery unattended overnight.
- Do not attempt to open, puncture, or modify the battery pack. Damaged lithium packs can vent and ignite.
- Reduce speed on gravel, wet surfaces, and downhill grades; a small tire adds grip but does not eliminate the risk of losing traction.
HKM-5809875 · 350 W brushless rear hub motor · 36 V 15 Ah lithium (540 Wh) · up to 18 mph top speed · 6-19 mi range · 16 in wheels · 265 lb (120 kg) load capacity · lightweight steel frame · single-speed drivetrain · disc brake · LED headlight. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under light pedal-assist on level pavement. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads.
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