Balance Bikes >>
HKM-3673683 20 Inch Foldable Electric Balance Bike FXB01-20PRO EXTREME, 800W Hub 3 Speed Modes Hydraulic Disc Brake System
HKM-3673683
The Flagship That Folds for the Boot
The FXB01-20PRO EXTREME is the foldable flagship: an 800W hub motor paced through three modes of 15, 30 and 45 km/h, a 10Ah integrated battery with a manufacturer-rated range of 50-70 km per charge, and hydraulic disc brakes for reliable stopping power. The aluminium alloy frame folds for transport and storage without giving up stiffness, the 20-inch wheels hold stability across various terrains, and the waterproof design shrugs off the weather that ends lesser rides.
Key Features
Six details that define the HKM-3673683.
800W Hub Motor
The 800W hub motor delivers remarkable performance straight at the wheel, smooth and immediate. It is serious power for a kids' bike, paced through three modes so the rider always meets only as much of it as they have earned.
15 / 30 / 45 km/h Modes
Three speeds tailor the ride to the rider: 15 km/h in training mode, 30 km/h in mid mode and 45 km/h in advanced mode. Beginners and experienced riders each get a bike paced exactly to their ability.
10Ah Integrated Battery
The integrated 10Ah pack keeps the lines sleek and minimizes the likelihood of damage, with a manufacturer-rated range of 50-70 km per charge. Recharging takes just over 3 hours between sessions.
Folds for the Boot
The lightweight aluminium alloy frame is both foldable and stiff, which means easy transport and storage today and confident handling tomorrow. The boot-to-trail routine takes seconds.
Hydraulic Disc Brakes
The hydraulic disc brakes offer reliable stopping power with a smooth, progressive feel at the lever. At 45 km/h, braking is not a detail; it is the feature that makes the rest of the bike usable.
20-Inch Wheels, Waterproof Build
The 20-inch wheels provide stability and control on various terrains, and the waterproof design ensures durability in different weather conditions. This bike rides past the point where fair-weather bikes stop.
Overview
A foldable 20-inch flagship with an 800W hub motor, three speed modes and hydraulic disc brakes.
The HKM-3673683 is the FXB01-20PRO EXTREME: the flagship of the range, and the one that folds. The 800W hub motor delivers remarkable performance through three tailored modes, 15 km/h for training, 30 km/h for the middle ground and 45 km/h for advanced riders, while the integrated 10Ah battery covers a manufacturer-rated 50-70 km per charge and recharges in just over 3 hours. Hydraulic disc brakes provide reliable stopping power worthy of the pace, and the 20-inch wheels hold stability and control across various terrains. The lightweight aluminium alloy frame folds for transport and storage, the waterproof design shrugs off the weather, and the sleek integrated battery keeps the whole package clean, durable and ready for adventure.
Folds Small, Rides Big
Boot to trail in seconds.
The foldable alloy frame disappears into a boot or a hallway corner, then opens into a 20-inch flagship with 15, 30 and 45 km/h modes on tap. The 800W hub and the hydraulic disc brakes do the rest, wet or dry.
Full Specifications
Everything worth knowing, in one table.
Why the Fold Changes Everything
The best bike is the one that is with you.
A bike that cannot travel gets left behind, and a bike left behind teaches nobody anything. The HKM-3673683 folds at the frame, so the flagship of the range rides in the boot to the coast, the park or the grandparents, then unfolds into 20-inch wheels, an 800W hub motor and three modes paced at 15, 30 and 45 km/h. The integrated 10Ah battery carries a manufacturer-rated 50-70 km per charge with recharging in just over 3 hours, and the hydraulic disc brakes answer the pace with reliable, progressive stopping power. The waterproof design and lightweight alloy frame mean the weather and the distance stop mattering. It is a tailored riding experience, whether the rider is a beginner or already experienced, wherever the day goes.
What’s in the Box
What arrives in the box, ready to build.
1 x 20-Inch Foldable Balance Bike
Frame, fork and wheels come fitted from the box
1 x Integrated 10Ah Battery
Built into the frame 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-3673683
Six reasons families pick the HKM-3673683.
A Pace for Every Ability
The 15, 30 and 45 km/h modes tailor the ride to the rider, from cautious first laps to advanced running. One bike serves the beginner and the experienced rider in the same family.
Range That Outlasts the Day
The manufacturer rates the 10Ah pack at 50-70 km per charge, which is extended playtime by any standard. Recharging takes just over 3 hours, so overnight is always enough.
It Goes Where You Go
The foldable alloy frame rides in the boot, on the train and in the hallway corner. Transport and storage stop being the reason the bike stays home, which is the whole point.
Brakes Built for the Pace
Hydraulic disc brakes offer reliable, progressive stopping power with none of the fade cable systems show. At 45 km/h, that is the feature doing the quiet work.
Weather Is Not a Curfew
The waterproof design ensures durability in different weather conditions, so damp mornings and surprise showers end fewer rides. The bike shrugs off what fair-weather bikes fear.
Stability at Every Speed
The 20-inch wheels provide stability and control on various terrains, and the stiff alloy frame keeps the handling honest whether folded shut or opened flat out.
Frequently Asked Questions
Straight answers about the HKM-3673683.
Who is the FXB01-20PRO EXTREME built for?
The HKM-3673683 is built for young riders who have outgrown the compromises: 20-inch wheels, an 800W hub motor and three speed modes tailored to ability. Beginners start in the 15 km/h training mode; experienced riders live in the 30 and 45 km/h modes. Judge readiness by skill, since the modes exist precisely so the bike can meet the rider where they are.
How do the three speed modes work?
The 3-speed system offers 15 km/h in training mode, 30 km/h in mid mode and 45 km/h in advanced mode, a tailored riding experience for different styles and abilities. Move up one mode at a time on ground with clear sight lines, with the brake under smooth control at the mode below. Adults should approve every change, and the mode should match the surface of the day. The progression is the safety feature, not a restriction.
How far does it go and how fast does it charge?
The integrated 10Ah battery carries a manufacturer-rated range of 50-70 km per charge, and recharging takes just over 3 hours. Actual range varies with the speed mode, terrain, rider weight and temperature, so treat the first rides as calibration. Charge indoors at room temperature on a hard surface and unplug once the charge completes.
How does the folding work, and is the frame still stiff?
The lightweight aluminium alloy frame folds at a dedicated joint for easy transport and storage, and it locks solid for riding. Practice the fold a few times at home until it is a ten-second routine, check the latch is fully engaged before every ride, and the bike behaves like a rigid machine once it is open.
What can the hydraulic brakes do that cable brakes cannot?
Hydraulic disc brakes offer reliable stopping power with a smooth, progressive feel at the lever, and they keep that feel consistent because the system self-adjusts as pads wear. On a bike paced to 45 km/h, braking is the safety foundation. Test the lever before every ride and have any sponginess inspected before riding again.
What assembly and upkeep are involved?
Setup covers the handlebar, seat height, a fold-latch check and a charge check with the supplied tools and manual. Beyond that: tire pressure weekly, a brake check before rides and a wipe-down after dusty or damp ones. The brushless hub motor and integrated battery keep the drivetrain simple, and the waterproof design forgives the weather that ruins other bikes.
Quick Troubleshooting
When the HKM-3673683 needs attention, start here.
The bike will not power on
Confirm the battery has charge, then check the power button and indicator with the bike unfolded on flat ground. If the indicator stays dark, connect the charger for twenty minutes and retry, inspect the charge port for grit or moisture, and confirm the fold latch is fully engaged, because some systems refuse to power on half-latched. If everything looks clean and the bike stays dead, note the details and contact support.
The range keeps shrinking
Compare riding style first, because the 45 km/h mode and hills use far more per minute than cruising at 15 km/h. Check tire pressure, since soft tires cost range twice. Cold weather trims every lithium pack. If nothing has changed, run one full uninterrupted charge and retest the same loop on the same mode, and log the loop you retest on before replacing anything.
The brake lever feels soft
Hydraulic systems rarely need attention, but a soft lever means air or a leak: check for visible fluid around the caliper and lever, and confirm the pads have material left. Do not ride on a spongy brake. If the lever still feels soft with no visible leak, 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 the wall and the bike. Charge indoors at room temperature, because cold packs refuse a full cycle, and check the port for grit or bent pins. If the indicator still never completes, stop forcing cycles and contact support with a note of recent charging times. Do not leave a stalled charge unattended overnight.
The motor cut out mid-ride
A battery running low or hot will step back before it dies, so start with a full charge and a cool-down. Confirm the speed mode has not been nudged, the power connections are seated and the fold latch is fully closed. If cutouts continue on flat ground in the low mode with a full, cool battery, note the mode in use and contact support. Climbs point to the pack; flat-ground cutouts point to the controller.
The bike will not reach 45 km/h
First confirm the mode is actually set to advanced, because the most common cause is the bike still in training or mid mode. 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 advanced mode 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-3673683.
The HKM-3673683 is a high-power 20-inch-wheel foldable balance bike with a 45 km/h advanced mode, so a certified helmet is mandatory before every ride, with closed shoes and snug laces completing the kit. Start in the 15 km/h training mode on flat, open ground until the rider has the hydraulic brake and the throttle under smooth control, with an adult approving every change. Confirm the fold latch is fully engaged, the battery is charged and the brake has its bite before every ride, and check the axle and stem hardware for torque. Keep fingers, laces and loose clothing clear of the hub while powered, and let hot parts cool after sessions. Charge indoors at room temperature on a hard surface, unplug once full, and never carry a passenger.
HKM-3673683 - FXB01-20PRO EXTREME foldable 20-inch electric balance bike with an 800W hub motor, three speed modes of 15, 30 and 45 km/h, an integrated 10Ah battery with a manufacturer-rated 50-70 km range, hydraulic disc brakes, a waterproof design and a foldable 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
