Balance Bikes >>
HKM-7972051 20-Inch Wheel Electric Balance Bike for Ages 5 to 12 with an 800W Brushless Motor, 36V Battery and Up to 30 km/h
HKM-7972051
800W on 20-Inch Wheels, Ages 5-12
The HKM-7972051 pairs a 16-inch-frame fit with 20-inch wheels for riders aged five to twelve who are ready for the open road. An 800W brushless rear hub motor paces three speed options up to 30 km/h, and the 36V lithium battery delivers 10-30 km per charge with running times of 30 to 60 minutes and 1-3 hour charging. The aluminium alloy frame keeps the weight to 12.8 kg with the battery fitted, the adjustable 54 cm seat tracks the growth, and the brake system brings dependable stops.
Key Features
Six details that define the HKM-7972051.
800W Brushless Rear Hub
The 800W brushless motor lives in the rear hub and delivers efficient performance with no chain to oil or tension. It is serious power for a kids' bike, paced through three speed options so the rider always meets only as much of it as they have earned.
Three Speeds to 30 km/h
Three speed options let the bike match the rider from cautious first laps to adventurous open-road running at up to 30 km/h. The range of pace is the safety feature: the top end exists, but it arrives only when the skills do.
20-Inch Wheels, 16-Inch Fit
The 20-inch wheels roll over cracks and ruts that would stop smaller bikes, while the 16-inch-frame geometry and 54 cm seat keep the fit right for riders aged five to twelve. It is the combination that makes the bike feel both big and manageable.
36V Battery, 10-30 km
The 36V lithium battery covers 10-30 km per charge with 30-60 minutes of running time, and the quick charging system replenishes it in 1-3 hours. A lunch break is long enough to restore the afternoon.
12.8 kg with Battery
At 12.8 kg including the battery, the bike lifts into a boot without drama and steers easily for the riders it is sized for. The aluminium alloy frame carries the weight savings without giving up durability.
Sized for the Years Ahead
The adjustable 54 cm seat, 1220x515x650 mm footprint and dependable brake system are all chosen for the long stretch from five to twelve. It is a pathway to freedom and adventure that does not need replacing each season.
Overview
A 20-inch-wheel balance bike for ages 5-12 with an 800W motor, 3 speeds and a 36V battery.
The HKM-7972051 is a 20-inch-wheel electric balance bike built for riders aged five to twelve who are ready for the open road. An 800W brushless rear hub motor paces three speed options up to 30 km/h, the 36V lithium battery delivers 10-30 km per charge with 30-60 minutes of running time, and quick charging restores it all in 1-3 hours. The aluminium alloy frame keeps the bike at 12.8 kg with the battery fitted, the adjustable 54 cm seat tracks the growth, and the dependable brake system handles the stopping. It blends safety and fun for the years when confidence is growing fastest.
Big Wheels, Managed Pace
Three speeds keep 30 km/h earned.
The 20-inch wheels roll over whatever the path offers, and the three speed options decide how fast the rider meets it. Up to 30 km/h at the top, calm and controlled below, with the switch under adult control.
Full Specifications
Everything worth knowing, in one table.
Why 20-Inch Wheels Change the Ride
Bigger wheels meet fewer problems.
Every crack, rut and gravel patch on a path is an obstacle sized against the wheel that meets it, which is why the HKM-7972051 runs 20-inch wheels under a 16-inch-frame fit. The big wheels roll over terrain that would stop a smaller bike, the steering stays light thanks to the alloy frame, and the rider inherits the stability of a big wheel with the reach of a small one. Around the wheels runs an 800W brushless rear hub paced through three speed options up to 30 km/h, a 36V battery delivering 10-30 km per charge, and a brake system with dependable stopping power. At 12.8 kg with the battery fitted, the combination rides bigger than it weighs, and the adjustable 54 cm seat keeps the fit honest from five to twelve.
What’s in the Box
What arrives in the box, ready to build.
1 x 20-Inch-Wheel Balance Bike
Frame, fork and wheels come fitted from the box
1 x 36V Lithium Battery
Seated in the mount and matched to the charger
1 x Mains Charger
Matched to the battery pack from the factory
1 x Seat and Post
Fitted, ready to set for the height of the rider
1 x Manual and Hex Keys
Setup sheets with the tools supplied in the pack
1 x Warranty Card
Registration details for the records at home
Why Choose the HKM-7972051
Six reasons families pick the HKM-7972051.
Wheels That Roll Through It
The 20-inch wheels treat cracks and ruts as texture rather than obstacles, so the ride stays smooth where smaller bikes jar and stall. Big wheels are the comfort upgrade nobody regrets.
A Pace for Every Stage
Three speed options cover the whole journey from cautious laps to confident 30 km/h running. The pace moves up as the rider earns it, and the adults hold the switch.
Range With Quick Recovery
The 36V battery delivers 10-30 km per charge, and 1-3 hour charging turns lunch into a full recharge. A forgotten battery rarely ruins the day.
Light Enough to Live With
At 12.8 kg with the battery fitted, the bike lifts into a boot and carries up the steps without drama. The aluminium alloy frame keeps the weight down for the riders lifting it too.
A Fit That Tracks Growth
The adjustable 54 cm seat and the 16-inch-frame geometry keep the bike right for riders from five to twelve. One bike covers the years when confidence grows fastest.
Stopping You Can Depend On
The brake line system delivers effective, dependable stopping power at every speed option. Reliable brakes are the quiet feature behind every confident ride.
Frequently Asked Questions
Straight answers about the HKM-7972051.
What ages and heights does the HKM-7972051 fit?
The bike is designed for riders aged five to twelve, with 20-inch wheels on a 16-inch-frame geometry, an adjustable 54 cm seat and a 1220x515x650 mm footprint. The honest check is both feet flat while seated with knees slightly bent and hands reaching the bars at comfortable extension. Because the top speed option reaches 30 km/h, also confirm the rider can brake smoothly by habit before moving up through the speed options.
How do the three speed options work?
Three speed options pace the bike through the 800W brushless rear hub, up to 30 km/h at the top. Start with the lowest option on flat, open ground until the throttle and the brake are under smooth control, then move up one option at a time on ground with clear sight lines. The pace should always match both the skill of the rider and the surface of the day.
How far does it go and how fast does it charge?
A full charge covers 10-30 km with running times of 30-60 minutes, depending on terrain, rider and speed option. The 36V lithium battery recharges in 1-3 hours at any wall socket. For the healthiest battery life, charge indoors at room temperature on a hard surface, unplug once the indicator shows full, and bring the pack inside on cold days before judging its charge.
Why 20-inch wheels on a kids' bike?
Wheel size decides what counts as an obstacle: a rut that stops a 12-inch wheel is texture to a 20-inch one. The big wheels give stability, roll over rough ground and keep the ride smooth, while the 16-inch-frame geometry and adjustable 54 cm seat keep the reach right for younger riders. It is the pairing that lets an eight-year-old ride paths an adult would respect.
Is 12.8 kg heavy for a kids' bike?
At 12.8 kg including the battery, the HKM-7972051 sits at the manageable end for a bike with this much wheel and motor: light enough for adults to lift into a boot and for riders to steer at walking pace. The aluminium alloy frame is where the weight savings live, and the removable battery shaves the pack weight whenever the bike travels without it.
What assembly and upkeep are involved?
Assembly covers the handlebar, seat height and battery seating, with the supplied hex keys and the manual. Beyond that: tire pressure weekly, a brake check before rides and a wipe-down after dusty ones. The brushless drive lives in the rear hub, so there is no chain to oil or tension all season. The whole routine fits a weekend morning.
Quick Troubleshooting
When the HKM-7972051 needs attention, start here.
The bike will not power on
Unclip the pack and seat it back until the latch clicks, because a pack just short of home makes no contact. Press the power button and watch for the indicator. If it stays dark, charge for twenty minutes and retry, check the mount contacts for grit, and confirm the wall socket with another device first. Cold packs read empty until warmed, so bring the bike indoors before judging a winter battery.
The run time keeps shrinking
Compare riding style before blaming the pack, because hills and the top speed option use far more per minute than cruising. Check tire pressure, since soft tires cost range twice. Cold weather trims every lithium pack. If nothing has changed, run one full uninterrupted charge cycle and retest the same loop, and log the loop you retest on before replacing anything.
The brake feels weak
Start with the lever and cable: check for stretch, grit at the lever pivot and full free travel, then follow the manual for adjustment. Retest on flat ground at low speed before returning to the higher options. If the bite still feels weak with the cable set correctly, note when the feel changed and contact support, because stopping power is the one system never to ride on a maybe.
The charger light never turns green
Confirm the wall socket with another device, then reseat the charger plug at both ends. Check the pack mount contacts for grit and charge indoors at room temperature, because cold packs refuse a full cycle. If the indicator still never completes, stop forcing cycles and contact support with a note of how long charging has taken recently. Do not leave a stalled pack on the charger unattended overnight.
The motor cut out mid-ride
A pack running low or hot will step back before it dies, so start with a full charge and a cool-down. Check the throttle connector for a half-seated plug and confirm the speed option has not been nudged. If cutouts continue on flat ground in the low option with a full, cool pack, note the option in use and contact support. Log when it happens: climbs point to the pack, flat-ground cutouts point to the controller.
The top speed will not reach 30 km/h
First confirm the speed option is actually in the top setting, because the most common cause is the bike still in a lower option. Next check tire pressure, since soft tires cap real speed long before the motor does. A low battery also steps the pace back to protect itself. If the bike still tops out short in the top option with fresh tires and a full charge, note the numbers and contact support.
Service & Policies
Coverage that rides every road with you.
Free Shipping on All Orders
Every order ships free. Handling time: 0-1 business days (Monday to Friday). Transit time: 2-5 business days (Monday to Friday). A tracking number is emailed as soon as the parcel leaves our warehouse.
180 Days Purchase Protection
Your purchase is protected for 180 days from the delivery date against manufacturing defects and damage in transit. If something arrives wrong, we make it right.
30 Days Money Back Guarantee
Not completely satisfied? Request a return within 30 days of delivery for a full refund. We keep the process simple and hassle-free.
24 Months Warranty Service
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.
Important Safety Notes
Read these notes before the first ride on the HKM-7972051.
The HKM-7972051 is a high-power 20-inch-wheel balance bike with a 30 km/h top speed option, so a certified helmet is mandatory before every ride, with closed shoes and snug laces completing the kit. Start in the lowest speed option on flat, open ground until the rider has the brake and the throttle under smooth control, with an adult approving every change. Confirm the battery is fully latched before each ride, test the brake for the bite, and check the axle and stem hardware for torque. Keep fingers, laces and loose clothing clear of the rear hub while powered, and let hot parts cool after sessions. Charge the 36V pack indoors at room temperature on a hard surface, unplug once the indicator shows full, and never carry a passenger.
HKM-7972051 - 20-inch-wheel electric balance bike for ages 5-12 with an 800W brushless rear hub motor, three speed options up to 30 km/h, a 36V lithium battery delivering 10-30 km per charge in 30-60 minutes of running time, an adjustable 54 cm seat and an aluminium alloy frame at 12.8 kg with battery. Read the manual before first use. Nothing here is safety certification advice.
Every product we offer includes a 180-day purchase protection plan at no additional cost. This coverage extends beyond a standard warranty, reflecting our confidence in product quality and our ongoing commitment to your satisfaction.
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How to File a Claim
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The 180-day purchase protection includes accidental damage and performance failures that are typically not covered by a standard warranty. It provides an additional layer of support during the first six months after purchase, giving you greater confidence and peace of mind.
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Request a return within 30 days of delivery.
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Refund processed within 10 business days.
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Comprehensive Coverage
Every part warranted for two full years.
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Claims assessed within 1 business day.
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Step-by-step solutions for product issues.
Contact Information
24/7 Phone
+1 (209) 280-3200
support@hekomart.com
Address
3401 Dale Rd, Modesto, CA 95356
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Available 24 hours a day, 7 days a week
