Balance Bikes >>
HKM-8004819 16-Inch Electric Dirt Bike for Kids with 350W Brushless Motor 3 Speeds Aluminium Frame Hydraulic Fork and Disc Brake
HKM-8004819
A Real Dirt Bike, Scaled for the Trail Ahead
The HKM-8004819 is the FXB05-16, a 16-inch electric dirt bike with a 350W brushless hub motor, three speed modes from 6 to 19 mph and a hydraulic front fork that soaks up the trail. The 5.0Ah lithium pack covers 31 to 43 miles per charge and refills in under an hour, the disc brake brings it all back down, and the waterproof aluminium alloy frame keeps the whole bike at 27.6 lb. Trail hardware, kid sized.
Key Features
Six details that make the HKM-8004819 a proper trail bike.
A 350W Brushless Hub
The brushless hub delivers its power without brush wear or jerky surges, pulling smoothly from a standstill and holding pace on loose climbs. It is the same layout adult e-bikes use, quiet enough for the neighborhood and strong enough for the trail.
Three Speed Modes
Three modes pace the bike to the rider: 6 mph for first laps, 9 mph for the confident stage and 19 mph for open trail. The modes turn one bike into a curriculum, and parents keep the switch under adult control until the rider earns the top end.
A Hydraulic Front Fork
The hydraulic fork absorbs the roots, rocks and ruts that a rigid fork sends straight to the hands, keeping the front wheel tracking when the ground turns rough. It is the component that turns a sidewalk bike into a trail bike.
31 to 43 Miles per Charge
The 5.0Ah lithium pack covers 31 to 43 miles per charge, which is trail-day range rather than driveway range. Charging takes under an hour, so a lunch break resets the day and the afternoon resumes without negotiation.
Disc Brake Stopping
The disc brake delivers firm, progressive stopping that keeps working in trail dust and damp grass. Riders learn proper lever braking while the speed modes are still low, which is the safest order to learn in.
Waterproof, 27.6 lb
The waterproof aluminium alloy frame shrugs off puddles and wet grass, and the whole bike weighs 27.6 lb with the battery aboard. Young riders can manage it at walking pace, load it into a car, and still have a real trail bike underneath them.
Overview
A 16-inch electric dirt bike with a 350W motor and hydraulic fork.
The HKM-8004819 is the FXB05-16, a 16-inch electric dirt bike built for young riders who have outgrown the sidewalk. A 350W brushless hub motor drives three speed modes paced at 6, 9 and 19 mph, and the hydraulic front fork keeps the wheel tracking when the trail turns rough. The 5.0Ah lithium pack covers 31 to 43 miles per charge and refills in under an hour, the disc brake provides the controlled stops that off-road riding demands, and the waterproof aluminium alloy frame holds the whole package to 27.6 lb. It is genuine trail hardware, scaled for the rider and built to grow with them through every mode.
Trail Range, Not Driveway Range
31 to 43 miles per charge, back in under an hour.
The 5.0Ah pack is the difference between owning a bike and using one: 31 to 43 miles covers a full trail morning with the return leg included, and under an hour on the charger resets it for the afternoon.
Full Specifications
Everything worth knowing, in one table.
Why a Hydraulic Fork Belongs on This Bike
Trails teach better when the bike absorbs the hits.
A rigid fork teaches a rider to dodge every root; a hydraulic fork teaches them the trail is rideable. The HKM-8004819 puts real damping up front so the wheel stays down and tracking when the ground turns rough, and the hands stay fresh long enough for the brake lessons to land. Around that fork sits a 350W brushless hub with three speed modes from 6 to 19 mph, and the 5.0Ah pack covers 31 to 43 miles per charge, with the under-an-hour recharge fitting inside lunch. The disc brake gives one-finger stopping in dust and damp alike, and 27.6 lb keeps the bike manageable when the trail ends. This is the bike that turns park laps into trail rides.
What’s in the Box
What arrives in the box, ready to build.
1 x 16-Inch Dirt Bike
Frame, fork and wheels come fitted from the box
1 x 5.0Ah Lithium Battery
Seated in the mount and matched to the charger
1 x Fast Charger
Refills the pack in under one hour
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-8004819
Six reasons families pick the HKM-8004819.
Trail Hardware, Kid Sized
A hydraulic fork, a disc brake and a torque-rich hub are the three upgrades that define a real dirt bike, and all three are here. Nothing about the platform is a toy except maybe the smile it produces.
A Speed Curve That Grows
Three modes pace the bike from 6 mph to 19 mph, so the same machine teaches the first laps and rewards the confident ones. Parents hold the switch, and the top end stays headroom rather than a habit.
Range for Real Trail Days
Up to 43 miles per charge covers a morning of loops with the climb home included. The under-an-hour recharge fits inside lunch, which makes range anxiety a thing other bikes have.
Fork Absorbs, Rider Learns
The hydraulic fork keeps the front wheel tracking through roots and ruts, so young riders learn line choice instead of fear. Comfort is what keeps the lessons going.
Weather Does Not End the Day
The waterproof frame and sealed electrics shrug off puddles, wet grass and the wash-down after. The ride ends when the rider is done, not when the sky is.
Light Enough to Manage
At 27.6 lb with the battery aboard, the bike stays manageable at walking pace and car-boot duty. A trail bike a kid can actually handle is a trail bike that gets ridden.
Frequently Asked Questions
Straight answers about the HKM-8004819.
What ages and heights does the HKM-8004819 fit?
The 16-inch FXB05 platform suits riders who have outgrown smaller balance bikes, typically from around age five depending on leg length. The honest check is both feet flat while seated with knees slightly bent, hands reaching the bars at full but comfortable extension. Because this bike carries suspension and speed, also confirm the rider can hold the bars and work the brake lever with one finger before choosing a faster mode. The 132 lb-class load rating covers the learning band with room to grow.
How do the three speed modes work?
The modes pace the bike at roughly 6, 9 and 19 mph, and the switch belongs to the adults. Start in the 6 mph mode on flat, open ground until the throttle and brake are under smooth control; move up only when the rider stops the bike smoothly on command. The 19 mph mode is for open trail and experienced hands. Pick the mode for the path before the ride starts, and the top end stays headroom rather than a habit.
How far does one charge really go?
The 5.0Ah lithium pack covers 31 to 43 miles per charge, with the exact figure depending on mode, terrain and rider weight. Hills and the 19 mph mode use far more per mile than cruising, so treat the rating as a fair-weather number and ride out with the return leg in reserve. Charging takes under an hour from empty, which is short enough to plan around: a lunch break resets the bike for the afternoon.
Does the hydraulic fork need maintenance?
Very little. Wipe the stanchions clean after dusty or muddy rides so grit never drags past the seals, and cycle the fork through its travel now and then to redistribute the lubricant. If the fork starts to feel sticky or pogo-like with clean stanchions, note when it started and contact support before disassembling anything. Store the bike fork-up so the seals stay lubricated evenly.
Is it really waterproof?
The frame and electrics are sealed against rain, puddles and wet trail grass, so damp weather does not end the day and the bike tolerates a wash-down after muddy rides. That said, waterproof is not submarine: avoid standing water deeper than the hub, dry the bike after heavy wet rides, and always charge the pack indoors at room temperature rather than on a wet porch.
What assembly and upkeep are involved?
Assembly covers the handlebar, seat height, fork check and battery seating, with the supplied hex keys and the manual. Beyond that: tire pressure weekly, a brake squeeze test before rides, clean stanchions after dusty rides and a wipe-down. There is no chain on the bike, so nothing needs oiling or tensioning all season. The whole routine fits a weekend morning, and the hex keys live with the manual.
Quick Troubleshooting
When the HKM-8004819 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 half an hour 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, and make the click part of the pre-ride routine.
The brake feels weak or gritty
Start with the rotor: a wipe with isopropyl alcohol removes the dust and film that dull the bite. Squeeze the lever and watch the pad meet the rotor evenly; a grinding sound means grit or a worn pad, which is a support conversation rather than a trailside fix. Trail dust accelerates wear compared with pavement, so check the lever feel weekly and keep a small brush in the kit for the caliper area.
The fork lost its smoothness
Wipe the stanchions with a clean cloth and check for dried mud, which drags past the seals. Cycle the fork through its travel a few times to redistribute the lubricant. If the stiction persists with clean stanchions, note when it started and contact support before disassembling anything. A sag check takes a minute and keeps the setup honest after big changes in rider weight.
The range keeps shrinking
Compare riding style before blaming the pack, because the 19 mph mode and climbing use far more per mile 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. Log the loop you retest on, because different trails make different numbers, and retest before replacing anything.
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 mode switch has not been nudged. If cutouts continue on flat ground in the low mode with a full, cool pack, note the mode in use and contact support. Log when it happens: climbs point to the pack, flat-ground cutouts point to the controller.
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 while you wait to retest.
Service & Policies
Coverage that rides every trail 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-8004819.
The HKM-8004819 is a fast electric dirt bike capable of 19 mph, so a certified helmet is mandatory before every ride, and closed shoes with snug laces complete the minimum kit. Start in the 6 mph mode on flat, open ground until the rider has both the throttle and the brake under smooth control, and let an adult approve every mode change. Confirm the battery is fully latched before each ride, squeeze the lever to feel the bite, and check the fork and axle hardware for torque. Keep fingers, laces and loose clothing clear of the rear hub, the rotor and the fork stanchions while the bike is powered, and let hot parts cool after long sessions. Charge the 5.0Ah pack indoors at room temperature on a hard surface, unplug once the indicator shows full, and never carry a passenger.
HKM-8004819 - 16-inch FXB05 electric dirt bike with a 350W brushless hub motor, three speed modes up to 19 mph, a 5.0Ah lithium battery with 31 to 43 miles of range per charge, a hydraulic front fork, a disc brake and a waterproof aluminium alloy frame at 27.6 lb. 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
