Balance Bikes >>
HKM-3646675 20-Inch Electric Balance Bike with 36V Lithium Battery, 60-70Nm Hub Torque and Adjustable 58-68cm Saddle Height
HKM-3646675
A 20-Inch Step-Up Bike With Real Range
The HKM-3646675 is the step up riders grow into, a 20-inch balance bike built on a light aluminium alloy frame with a 36V lithium pack that carries it 6 to 19 miles per charge. The rear hub motor pulls with 60 to 70 Nm of torque and cruises between 19 and 31 mph, while the disc brake answers one lever with a clean, repeatable stop. The saddle slides from 58 to 68 cm so the bike follows the rider for seasons, the 95 cm wheelbase keeps the handling stable at speed, and the whole package recharges in one to three hours between sessions.
Key Features
Six details that define how the HKM-3646675 rides.
A Rear Hub With 60-70 Nm
Drive goes straight into the rear tire with no chain to oil and nothing hot near small legs. The torque arrives early and evenly, which is what keeps a full-size 20-inch platform feeling manageable to a rider who has only known pedal bikes before it.
A 36V Pack With Mileage
The lithium pack rides in the frame and powers sessions measured in miles rather than minutes, with a full charge taking one to three hours. That range turns a quick spin around the block into a real afternoon out with the family.
A Disc Brake That Bites
One lever, one disc, and a bite that stays predictable on pavement and packed dirt alike. Discs shrug off wet grass where rim brakes fade, so the stopping habit a rider learns in week one still holds in month six.
A Saddle That Follows
The seat post adjusts from 58 to 68 cm with an alloy hold hoop underneath, so the bike grows through the years instead of being outgrown. Both feet stay reachable at every setting, which keeps confidence high while the bike gets taller.
Geometry Built Straight
A 95 cm wheelbase plants the wheels far enough apart to settle the steering, and the 20-inch knobby tires track loose gravel without wandering. The overall footprint of 57 by 27 by 35 inches fits a garage hook and a car boot alike.
A Display on the Bars
The handlebar display shows speed and battery state at a glance, so a parent can call the end of a session before the pack runs flat. Small information, but it saves the long walk-home conversation every single time.
Overview
A 20-inch electric balance bike with 36V power and disc brakes.
The HKM-3646675 is a 20-inch electric balance bike for riders who have outgrown the small stuff. A rear hub motor with 60 to 70 Nm of torque drives a light aluminium alloy frame from a 36V lithium pack, good for 6 to 19 miles per charge and speeds from 19 to 31 mph depending on mode and terrain. A disc brake delivers one consistent stop from a single lever, the saddle travels from 58 to 68 cm to follow the rider, and the 95 cm wheelbase keeps the platform steady on gravel, grass and pavement. Charging takes one to three hours, and the handlebar display keeps speed and battery state visible for the whole session.
One Lever, One Disc, Every Stop
Braking that stays honest in every weather.
The disc brake gives the HKM-3646675 a bite that does not change between dry pavement and dewy grass, and the lever needs only small fingers to work it. Riders learn the stopping point once and trust it for the whole season.
Full Specifications
Everything worth knowing, in one table.
Why 20 Inches Changes the Game
The size where bikes start going places.
Twenty-inch wheels are where a balance bike stops being a toy and starts covering ground. The larger diameter rolls over roots, kerbs and gravel that stop smaller wheels dead, and the 95 cm wheelbase gives the HKM-3646675 the straight-line calm that lets a rider look up and plan instead of staring at the front tire. The trade is weight, and the aluminium alloy frame is the answer, keeping the bike liftable by a parent and pushable by a rider even with the 36V pack seated in the frame. The 58 to 68 cm saddle range means the same geometry works from the first wobbly session to the last confident one, and the 6 to 19 mile range means the bike outlasts the legs that ride it.
What’s in the Box
What arrives in the box, ready to roll.
1 x 20-Inch Balance Bike
Frame, fork and wheels arrive fitted
1 x 36V Lithium Battery
Pack seated in the frame mount
1 x Mains Charger
Matched to the pack voltage
1 x Saddle and Seat Post
Fitted and ready to set for height
1 x Manual and Hex Keys
Setup sheets with the tools included
1 x Warranty Card
Registration details for the warranty file
Why Choose the HKM-3646675
Six reasons the HKM-3646675 earns its place.
It Covers Real Distance
A 6 to 19 mile range per charge turns a ride into an outing. The 36V pack recharges in one to three hours, so an afternoon session and a top-up before dinner both fit the same day.
The Frame Stays Light
Aluminium alloy keeps the 20-inch platform liftable over a kerb and carryable to the car, which matters once the rider runs out of battery before they run out of enthusiasm.
Braking Never Relearns
The disc brake bites the same on day one and day one hundred, dry or damp. One habit, learned early, keeps working through every season the bike is ridden and every rider who sits on it.
The Saddle Grows Too
Fifty-eight to sixty-eight centimetres of saddle travel covers years of leg growth. One bike serves the whole window instead of being traded up every spring, and both feet stay down at every height.
It Handles Loose Ground
The 95 cm wheelbase and knobby 20-inch tires hold a line on gravel and grass, so the bike goes where family rides actually go, not just the smooth driveway circles.
Parents See the State
The handlebar display reports speed and battery at a glance, so the end of a session is a decision instead of a surprise on a hill half a mile from the car.
Frequently Asked Questions
Straight answers about the HKM-3646675.
What ages and heights does the HKM-3646675 fit?
The honest measure is inside leg, not age: with the saddle anywhere in its 58 to 68 cm travel, the rider should plant both feet flat while seated. The 20-inch platform suits riders who already roll confidently on smaller balance bikes and want something that covers ground. Check leg length before ordering and set the lowest saddle for the first week. Leg length beats age as the measure every time.
How far does one charge actually go?
The 36V pack delivers 6 to 19 miles per charge, and the spread is real-world honest: full-throttle sprints on grass land near the low end, steady cruising on pavement reaches the high end. Rider weight and tire pressure move the number too. The handlebar display shows the remaining state, so planning a return leg never depends on guessing. Riding gently for the last mile costs almost nothing.
How fast is it in practice?
Between 19 and 31 mph depending on mode, terrain and how the rider uses the throttle. On a flat paved path expect the middle of that band; on grass or a gentle climb expect less. Pick the riding area to match the speed, and keep early sessions on wide, quiet surfaces where the top end is never needed. Speed with stability is exactly the point of this size.
What does the handlebar display show?
Speed and battery state, the two numbers that matter mid-ride. The speed readout settles arguments about how fast the last stretch really was, and the battery state ends the classic surprise of a pack dying far from home. Glance, decide, and turn back while the return leg still has power behind it. It updates continuously rather than in jumps.
What assembly and upkeep are involved?
Assembly covers the handlebar, saddle height and battery seating, with the supplied hex keys and the manual. Upkeep is short: tire pressure, a brake squeeze test before each session, a wipe-down after dusty rides and a look at the disc after any wet one. There is no chain anywhere on the bike, so nothing needs oiling. Ten minutes a week covers the whole list.
How does it handle gravel and grass?
Well, by design. The 95 cm wheelbase keeps the steering calm when loose stones shift under the front tire, and the knobby 20-inch tires find grip where slick ones slide. Fresh-cut grass is the hardest surface and still rideable at moderate speed. For genuinely rough trails, lower the tire pressure slightly and slow down. Dry sand and deep mud are the two surfaces to avoid.
Quick Troubleshooting
When the HKM-3646675 needs attention, start here.
The bike will not power on
Unclip the pack and seat it back until the latch clicks, because a pack short of home makes no contact. Press the power button and watch the display light. If it stays dark, charge for half an hour and retry, check the mount contacts for grit, and confirm the wall socket with another device before suspecting the bike. If the display was left on overnight, the pack may simply be low, so charge before deeper checks.
The brake feels soft
Check the lever first: it should bite well before half travel. Take up slack at the barrel adjuster, then inspect the cable anchor at the calliper. A rotor touched by oily fingers will glaze and lose bite, so clean it with isopropyl alcohol and replace pads that have soaked oil through. Spin the wheel after adjusting to confirm the rotor runs true between the pads with no rub.
The range keeps getting shorter
Compare riding style before anything else, because repeated full-throttle starts use far more per mile than steady cruising. Check both tire pressures, since soft tires cost range twice over. Cold weather trims every lithium pack. If nothing has changed, run one full uninterrupted charge cycle and retest the same loop. A pack past two hard seasons losing range evenly is normal wear, not a fault to chase.
The display stays dark or freezes
Check the display connector first, because a half-seated plug imitates a dead screen. Power the bike off, reseat the plug fully, and power on again. If the screen lights but freezes mid-ride, note the battery state shown and contact support, keeping rides short until the unit is checked. Keep connector work to support, because the display pairs with the controller.
The front wheel shudders
Lift the front end and spin the wheel: a steady spin with a light rub is normal, a heavy grind is not. Check the axle nuts for torque, then watch the rotor spin between the pads. A bent rotor shows as a rhythmic rub and needs straightening or replacing before the next real ride. If the shudder appears only under braking, the rotor is the suspect rather than the wheel.
The throttle feels uneven
A pack running low makes the motor surge under load, so start with a full charge. Check the throttle connector for a half-seated plug and keep the grip area clean and dry. If the surging continues with everything checked, note when it happens and contact support about the controller. Note the speed mode in use too, because a switch bump between modes can feel like surging.
Service & Policies
Coverage that stays on the job long after delivery day.
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-3646675.
The HKM-3646675 is a fast 20-inch machine, so a certified helmet goes on before the first throttle press and stays on for every session. Because this bike reaches higher speeds than smaller balance bikes, choose wide, quiet riding areas away from traffic and steep hills until the rider shows mature throttle control, and keep an adult within sight at all times. Check that the battery is fully latched before each ride, squeeze the brake lever to confirm the bite is there, and keep fingers, laces and loose clothing clear of the rear hub and the spinning disc. The disc and motor can run hot after long sessions, so let both cool before touching. Charge the 36V pack indoors at room temperature on a hard surface, unplug once the indicator shows full, and never carry a passenger.
HKM-3646675 - 20-inch electric balance bike with a rear hub motor delivering 60-70 Nm of torque, a 36V lithium battery with 6-19 miles of range per charge, a disc brake system, a saddle adjustable from 58 to 68 cm, a 95 cm wheelbase, knobby tires and a lightweight aluminium alloy frame. 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.
The protection plan is designed to provide practical help in real-world situations. Whether you encounter a manufacturing issue, a performance problem, or an unexpected accident, our team is ready to assist with clear, fair solutions.
What Is Covered
Manufacturing Defects
We replace items with material or workmanship flaws at no charge.
Performance Failures
Free repair or replacement if the product fails under normal use.
Accidental Damage
One-time courtesy replacement at a reduced price.
Zero Hidden Fees
All shipping costs for replacements and returns are covered.
How to File a Claim
How This Differs from the Warranty
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.
We want you to be completely satisfied with your purchase. If for any reason you are not fully happy, you may return your item within 30 days of delivery for a full refund. No lengthy forms, no unnecessary questions.
Our return policy is built on a simple principle: if the product is not right for you, we will make it right. We understand that online shopping involves trust, and we work hard to earn that trust with every order.
Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
Unworn or unused, with tags and original packaging.
Proof of Purchase
A receipt or order number is required.
Fast Refund
Refund processed within 10 business days.
How to Start a Return
Returns & Exchanges Overview
Damages & Exchanges
Please inspect your order as soon as it arrives. If the item is defective, damaged, or incorrect, contact us immediately so we can evaluate the issue and make it right. For exchanges, the fastest option is to return the original item and place a new order for the replacement.
We believe in the quality of our products, and we want you to share that confidence. Every product is backed by a 24-month warranty covering all structural and functional components, including zippers, buckles, straps, and fabric integrity.
The warranty is designed to be simple and accessible. You only need your proof of purchase to begin a claim, and our team will assess the issue promptly. If a manufacturing issue arises, we will make it right.
What the Warranty Covers
Comprehensive Coverage
Every part warranted for two full years.
Free Repair or Replacement
Whichever is faster, at no cost to you.
Quick Turnaround
Claims assessed within 1 business day.
Transferable
Warranty follows the product, not the owner.
How to File a Warranty Claim
Every order ships free—no minimums, no hidden fees. We currently deliver across the United States and are actively working to expand to more countries. We partner with reliable U.S. courier services to ensure your order arrives safely and on time.
Our delivery process is designed for transparency. From the moment you place your order to the moment it reaches your door, you receive clear updates at every stage. We carefully inspect each product before dispatch, and we provide tracking information as soon as your order ships.
Our U.S. Shipping Partners
USPS
Official national carrier with nationwide coverage.
UPS
Fast and reliable ground and express shipping.
FedEx
Express delivery with real-time tracking.
DHL eCommerce
Efficient parcel delivery for e-commerce shipments.
Delivery Process
Delivery Time Summary
Cancellations & Taxes
You may cancel your order at any time before it ships. All product prices include applicable taxes, and there are no additional VAT or customs fees for orders delivered within the United States.
Whether you have a question, need help with an order, or just want some advice, our support team is available around the clock. We don't just respond to messages—we work with you to find real solutions that fit your needs.
Our support specialists are trained to handle a wide range of requests, from product recommendations to technical troubleshooting. No matter the question, you can expect a professional and friendly response.
How We Can Help
Product Guidance
Our experts help you choose the right product.
Order Assistance
Modify orders, track shipments, or speed up delivery.
Warranty & Returns
Start claims or returns quickly and easily.
Technical Troubleshooting
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
Support Hours
Available 24 hours a day, 7 days a week
