Electric Dirt Bikes >>
HKM-3658963 Electric Bike 250W Rear-Hub Motor 48V 16-Inch Fat Tires 6-Speed Mechanical Disc Brakes Carbon Steel Frame
HKM-3658963
16-Inch Fat-Tire E-Bike
The HKM-3658963 is a compact 16-inch fat-tire electric bike built around a 250W rear-hub motor and a 48V system. Four-inch-wide tires grip pavement, sand, and soft ground alike, mechanical disc brakes keep stops short, and a 6-speed drivetrain covers the climbs. The carbon-steel frame keeps the build sturdy, and the 70-80 Nm of torque pulls away from a stop with confidence. Built for the rider who wants a small-footprint fat-tire e-bike for the city, the beach, or the snow.
Key Features
Nine HKM-3658963 details that make a compact fat-tire ride feel effortless.
250W Rear-Hub Motor
A 250W brushless rear-hub motor delivers 70-80 Nm of torque for smooth, steady acceleration from a stop.
48V System
The 48V system powers the motor efficiently, keeping the ride responsive and the throttle progressive.
16x4.0 Fat Tires
Four-inch-wide tires spread the load for grip on pavement, sand, and soft ground while keeping the ride stable.
6-Speed Drivetrain
A 6-speed derailleur covers the climbs and the flats, so the right gear is always one click away.
Mechanical Disc Brakes
Mechanical disc brakes keep stops short and predictable, with lever effort that stays light.
Carbon-Steel Frame
The carbon-steel frame keeps the build sturdy and durable, shrugging off the scuffs of daily use.
70-80 Nm of Torque
The rear-hub motor delivers 70-80 Nm of torque, so steep driveways and soft ground stop being an event.
All-Terrain Ready
The fat-tire setup handles the city, the beach, and the snow alike, so one bike covers the whole map.
Compact Footprint
The 16-inch frame keeps the build compact and easy to store, without giving up fat-tire grip.
Overview
A small-footprint fat-tire e-bike for the city, the beach, or the snow.
The HKM-3658963 is the compact fat-tire electric bike built for the rider who wants to go anywhere. A 250W rear-hub motor and a 48V system pull away from a stop with 70-80 Nm of torque, while 16x4.0 tires grip pavement, sand, and soft ground alike. Mechanical disc brakes keep stops short, a 6-speed drivetrain covers the climbs, and the carbon-steel frame keeps the build sturdy. This bike is about a small footprint with real fat-tire grip.
Grip That Fits Anywhere
16x4.0 fat tires, 70-80 Nm of torque.
The 250W rear-hub motor and four-inch tires make the ride feel planted on pavement, sand, and soft ground alike. The compact 16-inch frame keeps the build easy to store, without giving up fat-tire grip.
Full Specifications
Every figure below is shown in US customary units first, with metric units alongside it
Battery and Charging Details
A 48V system for the daily ride.
The 48V system powers the 250W rear-hub motor efficiently, keeping the ride responsive. Charge with the included charger and store the pack at room temperature when the bike will sit. Cold weather trims capacity until the pack warms, and real-world range moves with rider weight, terrain, and assist level.
Daily Use & Care
Ten minutes a month keeps the ride where it belongs.
Wipe the frame, saddle, and wheels with a damp cloth after wet or muddy rides - no pressure washer, ever.
Keep the chain clean and lubed so the 6 speeds shift cleanly. A gritty chain eats range before the pack does.
Check the fat tires weekly and keep them in the recommended pressure range. A soft tire drags and trims range.
Check the disc brake pads monthly; pads wear silently until they are gone.
Charge indoors at room temperature and unplug when the light turns green.
Keep the charge port covered between charges so moisture stays out.
Confirm the battery gauge shows the charge you expect before heading out.
Spin both wheels weekly and check that nothing rubs. A rubbing brake eats into the range.
What’s in the Box
The HKM-3658963 arrives partially assembled, first-ride essentials in one carton.
1 x HKM-3658963 Electric Bike
Arrives partially assembled - attach the front wheel, handlebars, and pedals, then torque-check everything and charge first.
1 x Battery
The 48V pack powers the ride.
1 x Charger
Recharges the 48V pack at any standard wall outlet.
1 x User Manual
Safety, setup, and care instructions.
1 x Quick-Start Guide
A one-page setup checklist for the first ride.
1 x Warranty Service Card
24 Months Warranty Service and support contacts.
1 x Assembly Toolkit
Allen keys and wrenches for the front wheel, handlebars, and pedals.
1 x Spare Screws Set
Extra fasteners for fenders and accessories.
1 x Cleaning Cloth
Wipes the frame, saddle, and wheels clean after muddy rides.
1 x Reflectors Kit
Front and rear reflectors for low-visibility rides.
Why Riders Pick the HKM-3658963
Nine reasons the 3658963 earns its daily keep.
Grip That Fits Anywhere
16x4.0 fat tires handle the city, the beach, and the snow alike, so one bike covers the whole map.
Stop with Confidence
Mechanical disc brakes keep stops short and predictable, even when the road is wet.
Gear Up for the Hills
The 6-speed covers the daily grades, so hills and headwinds stop being an event.
A Planted, Stable Ride
Four-inch-wide tires keep the ride stable on pavement and soft ground alike.
Quiet, Even Pull
The 250W brushless motor runs smooth and quiet, so the pull feels planted instead of jerky.
Built for Daily Use
The carbon-steel frame shrugs off scuffs and knocks, so the bike is built to be used.
Torque for the Steep Stuff
70-80 Nm of torque takes steep driveways and soft ground in stride.
A Small Footprint
The compact 16-inch frame is easy to store, without giving up fat-tire grip.
All-Terrain Ready
The fat-tire setup handles every surface, so the ride does not care where the road runs out.
Stops and Shifts With Confidence
Mechanical disc brakes and a 6-speed.
Mechanical disc brakes keep stops short and predictable, while the 6-speed drivetrain covers the climbs. The 3658963 holds the line wherever the trail or the street points.
Controls & Indicators
Every HKM-3658963 control explained in a single line.
Throttle
Twist or thumb, the response is progressive and easy to modulate.
Brake Lever
One finger is all the lever asks for; the disc brakes do the rest.
Gear Shifter
A thumb shifter covers the 6 speeds, so the right gear is always one click away.
Pedal Assist
Pedal-assist mode lets you dial in the effort from gentle to full power.
Power Button
Long-press to arm the system, short-press to toggle modes.
Display
Speed, battery level, and assist level stay on one screen.
Frequently Asked Questions
Common HKM-3658963 questions, answered briefly.
How much assembly is required?
Partially assembled: attach the front wheel, handlebars, and pedals, then torque-check everything and charge before the first ride.
Does it have gears?
Yes - a 6-speed derailleur covers the daily grades.
Can it ride off-road?
Yes - the 16x4.0 fat tires are built for gravel, sand, and soft ground.
Can it ride in the rain?
Light rain is fine - wipe it dry afterward and keep the charge port covered.
What warranty is included?
24 Months Warranty Service, 180 Days Purchase Protection, and 30 Days Money-Back Guarantee.
Is a helmet required?
Yes, every ride - a certified helmet is inexpensive protection.
What colors are available?
Black and Orange.
How fast does it go?
Confirm your local rules before riding on public roads.
Quick Troubleshooting
Common HKM-3658963 issues and what to check first.
The motor does not engage.
Confirm the battery is charged and seated, the system is powered on, and all connectors are seated.
Range dropped noticeably.
Check the tire pressure first - a soft fat tire drags and trims range. After that, look to the battery or terrain.
The brakes feel weak.
Check the pad condition; if the lever still reaches the bar, have the brakes serviced.
The gears skip.
Confirm the derailleur is adjusted and the cable is not stretched. A quarter-turn of the barrel adjuster often fixes it.
The display will not power on.
Confirm the pack has charge and is seated, then power cycle to reset.
Certifications & Standards
HKM-3658963 documented and tested for sale and transport.
CE
European Conformity (CE) marking covering the electrical assembly and charger.
EN 15194
European standard for electrically power assisted cycles (EPAC).
UL 2849
Electrical system safety certification for e-bikes.
RoHS
Restriction of Hazardous Substances (RoHS) compliance for the electronics and cells.
UN38.3
Lithium battery transport certification for safe shipping of the pack.
Tested Cells
Each battery batch is cycle-tested before assembly and again before shipping.
Built Sturdy for the Daily Ride
A carbon-steel frame.
The carbon-steel frame shrugs off the scuffs and knocks of daily use, so the bike is built to be used rather than babied.
Pre-Ride Safety Checklist
Thirty seconds of HKM-3658963 checks before every ride.
Check the 16x4.0 fat tires for pressure, cuts, and embedded debris before each ride.
Keep the motor area clear of mud, string, and debris before you set off.
Tighten handlebar, stem, and axle hardware monthly - vibration loosens fasteners.
Squeeze the brake levers hard while stationary - the bike should not roll.
Wear a helmet every ride and use the lights in low visibility.
Check your local e-bike rules before riding on shared paths or public roads.
Service & Policies
Every HKM-3658963 is backed by coverage designed to protect your investment.
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 before the first HKM-3658963 ride.
This HKM-3658963 is an electric bike rated per the spec sheet below - ride it where the law allows. Wear a helmet every ride and ride only where the law allows. Read the manual first and practice throttle and braking in an open, traffic-free area. Do not exceed the load limit. Slow down substantially on wet surfaces, gravel, and steep descents - braking distance grows fast. Never open, puncture, or modify the battery. Charge only with the supplied charger, indoors and attended, and unplug when full.
HKM-3658963 - 250W motor - 48V system - 16x4.0 fat tires. Specifications are for reference; actual performance varies with rider, terrain, and temperature. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads.
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
