Balance Bikes >>
HKM-3876051 16-Inch Electric Balance Bike with 36V Brushless Hub Motor, Two-Speed Drive and a 5.0Ah Lithium Battery System
HKM-3876051
A 16-Inch Cross Bike With Grown-Up Range
The HKM-3876051 is the FXB02-16 Pro Cross, a 16-inch electric balance bike that treats range as seriously as fun. A 36V brushless hub motor drives a lightweight aluminium alloy frame from a 5.0Ah lithium pack, good for 6 to 19 miles per charge and speeds under 19 mph. The two-speed system lets the rider pick a cruising pace for the path ahead, the disc brake answers one lever with an honest stop, and a full recharge takes one to three hours between sessions. Five colors, one platform, the middle size between 12 and 20 inches.
Key Features
Six details that define how the HKM-3876051 rides.
A 36V Brushless Hub Motor
Drive goes straight into the rear tire with no chain to tension and no sprocket to guard. Brushless means quiet running and even pull, which suits a rider who is still calibrating how much wrist equals how much go.
A 5.0Ah Pack With 6-19 Miles
The lithium battery sits in the frame and carries 6 to 19 miles per charge, numbers that turn a short loop into a proper outing. One to three hours on the charger resets it for the evening session.
Two-Speed Drive
The gear system gives the rider a calm pace for learning and a livelier gear for open paths. Switching is part of the ride ritual, and it teaches pace judgment that carries into every bike they will own later.
A Disc Brake, Full Stop
One lever works one disc with a bite that holds on pavement and hardpack alike. Because it does not fade when dew wets a rim, the stopping point a rider memorizes in week one stays true all season.
A Rigid, Direct Front End
The rigid fork keeps steering honest: the bars point where the wheel goes, with no suspension lag between hand and ground. For a cross bike this size it means lighter weight and one less thing to service.
Five Colors, One Platform
Blue, pink, purple, yellow or red over the alloy frame, with the same geometry and the same hardware underneath. The color is the only decision that does not affect the ride, so it can be the rider’s alone.
Overview
A 16-inch electric balance bike with two-speed drive and a disc brake.
The HKM-3876051 is a 16-inch electric balance bike built for riders between the small stuff and the big stuff. A 36V brushless hub motor pulls a lightweight aluminium alloy frame from a 5.0Ah lithium pack, giving 6 to 19 miles per charge at speeds that stay under 19 mph. The two-speed drive lets the rider set the pace for the path, and the disc brake delivers one predictable stop from a single lever. The rigid fork keeps the steering direct, the frame keeps the weight low and liftable, and a full charge takes one to three hours, which fits neatly between lunch and dinner.
Two Speeds, One Disc
Pace control with an honest stop behind it.
The HKM-3876051 pairs a two-speed drive with a disc brake, so the rider owns both ends of the ride: how fast it goes and how surely it stops. Learn the lower gear first, and the brake is already waiting when the higher one arrives.
Full Specifications
Everything worth knowing, in one table.
Why 16 Inches Is the Middle That Matters
Big enough to roll, small enough to own.
Sixteen inches is the size where confidence compounds. The wheels roll over cracks, roots and kerb edges that stop smaller bikes dead, yet the seat height still lets both feet find the ground without drama. The HKM-3876051 uses that balance deliberately: the aluminium alloy frame keeps the total weight liftable by a parent and pushable by the rider, the rigid fork keeps every steering input immediate, and the 6 to 19 mile range means the bike is rarely the reason a ride ends. It is also the platform that teaches habits worth keeping, because two-speed pacing and one-lever braking are the same controls they will meet on every faster bike afterward, sized here to be learned calmly.
What’s in the Box
What arrives in the box, ready to build.
1 x 16-Inch Balance Bike
Frame, fork and wheels come fitted
1 x 36V 5.0Ah Battery
Pack seated in the frame mount
1 x Mains Charger
Matched to the pack from the factory
1 x Saddle and Post
Fitted, ready to set for leg length
1 x Manual and Hex Keys
Setup sheets with the tools supplied
1 x Warranty Card
Registration details for the records
Why Choose the HKM-3876051
Six reasons families pick the HKM-3876051.
Range That Outlasts Legs
Six to nineteen miles per charge means the rider usually calls the end of the session, not the battery. The 5.0Ah pack recharges in one to three hours, so a morning ride and an afternoon lap both fit one day.
Weight a Parent Can Live With
The aluminium alloy frame keeps the 16-inch platform liftable into a boot and carryable up steps. Light enough to lift means it actually gets taken along, which is where most family bikes quietly fail.
Pace Is a Choice
The two-speed drive turns speed into a decision the rider makes, not an accident. Low gear for learning, high gear for open paths, and a habit of choosing deliberately that transfers to every bike afterward.
Stops That Do Not Drift
The disc brake bites the same on dry pavement and damp hardpack, so the stopping point stays memorized. One lever, one disc, and no relearning when the weather turns.
Steering With No Filter
The rigid fork passes every input straight to the front tire. There is no suspension to set up and nothing to go soft, which keeps the handling crisp and the service list short.
A Color They Chose
Five frame colors across the same platform means the bike can be the rider’s pick without any hardware compromise. Ownership starts with the color and grows into the controls.
Frequently Asked Questions
Straight answers about the HKM-3876051.
What ages and heights does the HKM-3876051 suit?
Fit is a leg-length question, not a birthday question: with the saddle set, both feet should rest flat on the ground. The 16-inch platform suits riders who already roll confidently on 12-inch bikes and want something that covers more ground per push. Set the saddle low for the first week and raise it as the feet stay down with ease. The 16-inch platform rewards riders who already steer well.
How far does one charge really go?
Between 6 and 19 miles, and the spread is honest rather than marketing. Steady low-gear cruising on pavement reaches toward the top of the band, repeated sprints on grass land near the bottom, and cold weather trims every lithium pack. The practical habit is simple: ride out with half the charge held in reserve for the return leg. Hold a quarter of the pack in reserve for headwinds.
How fast does it go?
Under 19 mph, with the two-speed drive setting how eagerly the motor answers. The low gear keeps first sessions at a jog-able pace, and the high gear suits quiet open paths once steering and braking are automatic. Choose the riding area for the speed the rider is ready for, and the bike never needs to use its top end. The low gear keeps beginners at a jog-able pace.
Why a rigid fork instead of suspension?
Because at this size, directness beats damping. A rigid fork makes the steering immediate, keeps the bike lighter, and removes the seals and settings that suspension adds to the service list. On the hardpack and pavement this bike is aimed at, the tires and frame do the small-bump work a fork would otherwise fake. Fewer parts also means fewer surprises mid-season.
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 a short list: tire pressure before sessions, a brake squeeze test, a wipe-down after dust, and a look at the disc after wet rides. There is no chain on the bike, so nothing needs oiling or tensioning. A torque check on the axle nuts belongs on the list too.
How does the two-speed system work?
The rider selects between two drive settings that change how eagerly the motor responds to the throttle, rather than a hard speed limiter. Switching takes a moment and can be done mid-ride, but making it part of the pre-ride check builds the better habit. Start low, move up when the path and the judgement both allow it. The switch position is part of the pre-ride check.
Quick Troubleshooting
When the HKM-3876051 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 it indoors before judging a winter battery.
The brake feels soft
Check the lever first: the bite should arrive 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 grip, so clean it with isopropyl alcohol and replace pads that have soaked oil through. Bed new pads with ten firm stops from walking pace before judging the final bite point.
The range keeps shrinking
Compare riding style before blaming the pack, because high-gear sprints use far more per mile than low-gear cruising. Check both tire pressures, since soft tires cost range twice. Cold mornings trim every lithium battery. If nothing has changed, run one full uninterrupted charge cycle and retest the same loop. Log the loop you retest on, because different routes make different numbers. Tire pressure is the cheapest range fix there is.
The low gear feels the same as high
Check the gear selector connector first, because a half-seated plug makes both settings read alike. Cycle the switch through both positions while stationary and listen for the change in response. If the modes still feel identical, note when it happens and contact support about the controller. Keep rides short and flat until the controller question is settled, and a quick video of the behavior helps support diagnose it faster.
The front wheel shudders
Lift the front end and spin the wheel: a light rub is normal, a heavy grind is not. Check the axle nuts for torque, then watch the rotor run between the pads. A rhythmic rub points to a bent rotor, which needs straightening or replacing before the next proper ride. Recheck after the first hard rides, because axle nuts can settle in early.
The throttle responds unevenly
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 the gear and speed it happens at and contact support. Water crossings deeper than the hub are best walked around.
Service & Policies
Coverage that keeps pace long after the box is opened.
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-3876051.
The HKM-3876051 is a powered cross bike, so a certified helmet goes on before the first throttle press and stays on for every session that follows. Choose wide, quiet riding areas away from traffic until the rider has braking and gear changes automatic, and keep an adult within sight whenever the bike is powered. Confirm the battery is fully latched before each ride, squeeze the brake lever to feel the bite, and keep fingers, laces and loose clothing clear of the rear hub and the spinning disc. The motor and disc can run hot after long sessions, so let both cool before touching the bike or loading it into a car. Charge the 36V pack indoors at room temperature on a hard surface, unplug once the indicator shows full, and never carry a passenger on the frame or the saddle.
HKM-3876051 - 16-inch electric balance bike with a 36V brushless hub motor, a 5.0Ah lithium battery with 6-19 miles of range per charge, a two-speed drive, a disc brake system, a rigid fork and a lightweight aluminium alloy frame in five color options. 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.
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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.
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Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
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Fast Refund
Refund processed within 10 business days.
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Returns & Exchanges Overview
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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
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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.
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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
