Electric Bicycles >>
HKM-9392339 48V 36Ah Folding Electric Fat Tire Bike, 1500W Rear Hub Motor, 31 mph Top Speed, 7-Speed, 20 x 4.0 in Fat Tire
HKM-9392339
1500 W 31 mph Folding Electric Fat Tire Bike
The HKM-9392339 folds around a reinforced central hinge, letting it collapse into a compact package that fits into a car trunk, closet, or office corner. Despite the folding design, it carries a 1500 W brushless rear hub motor and a 48 V 36 Ah lithium pack (1728 Wh) - a configuration more commonly found on full-size fat bikes.
Key Features
8 details that make the HKM-9392339 a dependable ride.
1500 W Brushless Rear Hub Motor
A 1500 W brushless motor is laced into the rear wheel hub, delivering power directly to the ground with minimal drivetrain loss. The sealed unit resists dust and moisture and requires little maintenance beyond occasional axle-nut checks.
48 V 36 Ah Lithium Pack (1728 Wh)
The integrated 1728 Wh pack is one of the largest available in a folding e-bike. It charges in just over 3 hours and supports long commutes or multiple short rides between charges.
Full Suspension: Lockable Front Fork + Rear Shock
A hydraulic front fork with lockout and a rear shock smooth out rough pavement and trail chatter. The lockout is useful for efficient pedaling on smooth bike paths.
Hydraulic Disc Brakes
Hydraulic disc brakes provide strong, predictable stopping power with minimal lever effort. Power-off levers cut motor power as soon as either brake is applied.
7-Speed Derailleur Drivetrain
A 7-speed index derailleur gives the right gear for hills, flats, and stop-and-go traffic. It works independently of the motor, so you can pedal home if the battery is depleted.
20 x 4.0 in All-Terrain Fat Tires
The wide casing runs at lower pressure than standard tires, absorbing bumps and maintaining traction on gravel, wet pavement, and hard-packed sand.
LED Headlight and Integrated Brake Light
A bright LED headlight and brake-activated tail-light are powered by the main battery, improving visibility during early-morning or evening rides.
Folding Frame and Rear Rack
The reinforced folding hinge lets the frame collapse quickly for storage or transport. A rear rack adds utility for groceries, backpacks, or a small bag.
Overview
Built for the ride ahead.
The HKM-9392339 folds around a reinforced central hinge, letting it collapse into a compact package that fits into a car trunk, closet, or office corner. Despite the folding design, it carries a 1500 W brushless rear hub motor and a 48 V 36 Ah lithium pack (1728 Wh) - a configuration more commonly found on full-size fat bikes. The 20-inch fat tires and upright stance make it just as capable on mixed surfaces as it is convenient to store. A twist throttle and 5 pedal-assist levels give you a choice between effortless electric cruising and active pedaling. The 7-speed derailleur provides useful gear ratios for hills and flat stretches, while the reinforced hinge and locking mechanism maintain frame stiffness when the bike is unfolded and ridden. The integrated battery sits inside the frame, protected from road spray and prying hands. Range depends on how much you pedal.
31 mph Top Speed
Top speed sits at 31 mph — quick enough for the flow of traffic, steady enough to trust.
That is the standard the HKM-9392339 is built to. The measure of a tool is how little you notice it once the work begins. Considered in the hand, quiet in use, and calm at the end of the day.
Full Specifications
Measurements are shown in US customary units first, with metric equivalents in parentheses.
Battery, Range, and Charging
Up to 35-80 mi (56-128 km) per charge.
The 48 V 36 Ah pack stores 1728 Wh of energy. That capacity is unusually large for a folding e-bike and is what lets the bike handle throttle-only commutes and longer recreational rides without daily charging. Throttle-only riding on flat pavement at moderate speed lands in the 35-45 mi band. Moderate pedal-assist on the same terrain regularly returns 55-80 mi. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent.
Daily Use & Care
A short routine keeps the ride quiet and the range where it should be.
Tire pressure sets the character of the bike. Run 15-20 psi on pavement for lower rolling resistance; drop to 10-12 psi for gravel and dirt so the tire can flatten and grip the surface.
Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel.
Check that the folding hinge lock, axle nuts, and stem bolts are secure before each ride.
Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or dusty conditions.
Inspect brake pad thickness monthly. Replace when the friction material is under 1 mm.
Charge indoors at room temperature. Unplug the charger once the indicator turns green.
Keep the display and charge port covers closed when the bike is parked outside.
What’s in the Box
Everything needed to get riding, right out of the box.
1 x HKM-9392339 Folding Electric Bike
1 x HKM-9392339 folding electric bike
1 x 48 V 36 Ah Integrated Lithium Battery Pack
1 x 48 V 36 Ah integrated lithium battery pack
1 x High-efficiency Charger with 100-240 V Input
1 x High-efficiency charger with 100-240 V input
2 x Battery Keys
2 x Battery keys
1 x Toolkit with Hex Wrenches and Pedal Spanner
1 x Toolkit with hex wrenches and pedal spanner
1 x Pair of Pedals
1 x Pair of pedals
1 x User Manual and Assembly Guide
1 x User manual and assembly guide
Why Choose the HKM-9392339
6 reasons it earns its place.
Folding Convenience
The reinforced hinge folds the frame and stem into a compact package that fits in a car trunk or closet, while the motor, battery, and suspension are sized like a full-size fat bike.
Full Suspension for Real Roads
Potholes, expansion joints, and gravel shortcuts become manageable when the front fork and rear shock absorb impacts. The fork lockout firms the ride on smooth pavement.
Two Ways to Ride
Twist the throttle for immediate acceleration, or shift through the 7-speed cassette and pedal. Most owners mix both - throttle to get moving, pedals to extend range.
Direct-Drive Simplicity
The rear hub motor has no mid-drive gearbox or extra chain to service. Fewer moving parts mean less maintenance and a quiet ride.
Fat Tires Expand Where You Can Ride
The 20 x 4.0 in tires maintain traction on loose surfaces and roll over obstacles that would stop narrower tires.
Built for Daily Use
Sealed connectors, a covered battery compartment, and hydraulic brake lines resist road spray and corrosion for daily commuting.
Every Component Chosen for Real-World Use
Every component of the HKM-9392339 is chosen for real-world use.
It is built to be ridden regularly, cleaned easily, and kept in top condition with routine care. The HKM-9392339 pairs a 1500 W brushless rear hub motor, 48 V 36 Ah lithium-ion (1728 Wh), integrated and lockable, a range of 35-80 mi (56-128 km), varies with terrain, rider weight, and assist level, so it is built for real-world rides rather than showroom specs.
Controls & Indicators
What each control on the HKM-9392339 does.
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons on the display cycle through 5 pedal-assist levels plus zero assist
Twist Throttle
Right-hand grip; proportional response, works independently of pedal-assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
5-segment charge indicator plus percentage readout on the LCD
Light Switch
Long-press the up button to toggle the LED headlight and integrated tail-light
Shifter
Right-hand index shifter for the 7-speed rear derailleur
Frequently Asked Questions
Quick answers about the HKM-9392339.
How much assembly is required out of the box?
The bike ships approximately 85 percent assembled. Remaining steps are fitting the front wheel, straightening and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 30-45 minutes with the supplied tools.
What is the actual range I should plan for?
Plan for 35-80 mi depending on how much you pedal. Throttle-only riding at higher speeds lands closer to 35-45 mi.
How does the folding mechanism work?
A reinforced central hinge allows the frame to fold in seconds. The stem and handlebars also collapse for a more compact profile. No tools are required for normal folding.
Is a license or registration required?
Rules vary by state and locality. A 1500 W motor with a 31 mph top speed may exceed common three-class e-bike limits. Check local ordinances before riding on public roads or paths.
How long does the battery take to charge?
About just over 3 hours from fully empty with the supplied charger. Partial top-ups take proportionally less time.
Can I pedal it if the battery runs out?
Yes. The 7-speed drivetrain works independently of the motor. The bike is heavy at approximately 80 lb, so unassisted pedaling is slow but possible on flat ground.
Will the brakes handle the speed?
Hydraulic disc brakes front and rear are the appropriate specification for this weight and speed. Bed the pads in during the first few rides.
Is the battery removable for indoor charging?
The battery is integrated into the frame and charges through the frame-side port. It can be removed by a qualified technician for service or replacement.
Quick Troubleshooting
Common issues and what to check first.
The motor does not engage when I twist the throttle.
Confirm the display is on and shows charge, the battery is locked into place, and both brake levers are fully released. If the display shows an error code, note it and contact support.
Range dropped noticeably compared with when it was new.
First check tire pressure and temperature. If range is down more than 30 percent year-round after many charge cycles, the pack may be approaching the end of its service life.
The brakes feel spongy at the lever.
Sponginess in a hydraulic system usually means air in the line or a fluid leak. Stop riding and have the system bled and inspected.
The chain skips under hard pedaling.
Adjust the barrel adjuster a quarter turn at a time to align the indexing. If the chain skips only in the smallest cogs, the cassette is worn and should be replaced along with the chain.
The front fork rattles over bumps.
Check that the quick-release lever is fully closed and the wheel is seated in the dropouts. If the rattle persists, have the fork inspected.
The display shows an error code and the bike will not move.
Power the system off, wait 30 seconds, and switch it back on. If the code returns, note the exact code and contact support.
Certifications & Standards
Documented and tested for sale.
CE
European Conformity (CE) marking where applicable for the safety and electrical assembly.
ISO 9001
Quality management system held by the manufacturing facility.
Compliance Docs
Safety and compliance documentation included with every unit on request.
Tested
Each unit is inspected and function-tested before it leaves the warehouse.
From Frame to Wheels
From the frame to the wheels, the HKM-9392339 is built for consistent, confident performance.
The specifications above show exactly what is under the surface, and the ride proves it every time. The HKM-9392339 pairs a 1500 W brushless rear hub motor, 48 V 36 Ah lithium-ion (1728 Wh), integrated and lockable, a range of 35-80 mi (56-128 km), varies with terrain, rider weight, and assist level, so it is built for real-world rides rather than showroom specs.
Pre-Ride Safety Checklist
Run through these before every ride.
Check tire pressure and set it for the terrain you plan to ride: 15-20 psi for pavement, 10-12 psi for gravel or dirt.
Squeeze both brake levers. They should firm up well before reaching the grip.
Confirm the battery is seated and locked, and that the display shows the expected state of charge.
Spin both wheels and check that the rims run true and nothing rubs the brake pads or the frame.
Verify the folding hinge lock, axle nuts, and stem bolts are tight.
Test the throttle at walking pace in a clear area before riding in traffic.
Switch on the headlight and tail-light if you will be riding near dusk.
Service & Policies
Every HKM-9392339 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 ride.
This 1500 W bike is rated at 31 mph. Read the manual first and practise throttle and braking in an open, traffic-free area. Leave extra room for braking, since stopping distance grows fast with speed and load. Wear a helmet every ride; a certified downhill or motorcycle helmet is wise at 31 mph. Do not exceed the 330 lb (150 kg) load limit, including rider, cargo, and rack load. Confirm local law before riding on public roads. Bed the brakes in with 10-15 progressive stops over the first rides. Never ride through water deep enough to reach the motor or battery. Charge only with the supplied charger, indoors and attended. Never open, puncture, or modify the pack. Slow down substantially on gravel, wet surfaces, and steep descents.
HKM-9392339 - Folding Electric Fat Tire Bike. Specifications are for reference; actual performance varies with rider, terrain, tire pressure, 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
