E-Bike >>
HKM-7877331 Dual Motor Electric Fat Tire Bike, 2 x 750W Motors, 48V 20Ah Battery, 26 x 4 in Tires, Hydraulic Disc Brakes
HKM-7877331
Dual-Motor All-Terrain Fat Bike
The HKM-7877331 is a full-suspension fat bike with a 750 W brushless hub motor in each wheel - run them together for dual-drive pull or one at a time to stretch the 48 V 20 Ah pack past 37 mi (60 km) per charge. Hydraulic disc brakes on 26 x 4 in tires, a 7-speed drivetrain, and 60-70 N.m of torque per motor give it real climbing authority, and the down-tube battery recharges in a little over 3 hours.
Key Features
Eight details that make the HKM-7877331 a dependable daily ride.
Two 750W Hub Motors
A brushless 750 W motor sits in each wheel. Run dual drive for 60-70 N.m of torque from both ends of the bike, or switch to a single motor when the road is easy and you want the extra miles.
48V 20Ah Lithium Pack
The large-capacity pack sits in the down tube for a low center of gravity and returns more than 37 mi (60 km) per charge - with a full recharge taking a little over 3 hours.
Hydraulic Disc Brakes
Hydraulic discs front and rear give firm, modulated stopping power that does not fade on long descents and stays consistent in the wet.
26 x 4 in Fat Tires
Four-inch-wide tires float over sand, snow, and broken pavement, with a contact patch that grips where a normal tire would wash out.
Full Suspension
A suspension fork and rear shock absorb the hits, so the ride stays composed on gravel, roots, and curb drops instead of rattling your hands.
Shimano-Style 7-Speed Drivetrain
The 7-speed drivetrain covers pedaling on the flat, spinning up climbs, and holding a cadence when the pack runs low.
37+ mi Per Charge
Rated above 60 km per charge, the HKM-7877331 covers a long weekend loop or a week of commutes between plug-ins.
265 lb Load Rating
The aluminum alloy frame carries up to 265 lb (120 kg) of rider and cargo, with a rack-ready rear end for the errands run.
Overview
Two motors, one very long ride.
The HKM-7877331 is a dual-motor fat bike built for the rider who wants power in reserve. Each wheel carries its own 750 W brushless hub motor, so the bike can pull with both - or sip the 48 V 20 Ah pack gently in single-motor mode to stretch the range past 37 mi (60 km). Full suspension, 26 x 4 in tires, and hydraulic disc brakes keep the ride planted, while the 7-speed drivetrain keeps you pedaling when you want to.
Planted, Composed, Unbothered
Grip you can lean on.
With a hub motor driving each wheel and four-inch tires under both, the HKM-7877331 stays planted where lesser bikes wash out. Full suspension smooths the hits before they reach your hands. It is the kind of composure you notice on the first loose corner - and trust ever after.
Why Choose the HKM-7877331
Eight reasons it earns its place by the door.
Power in Reserve
Two motors mean you never have to spend more than the moment needs. Dual drive for the climb, single drive for the cruise - the 20 Ah pack covers either strategy for 37+ mi.
Climbing Authority
60-70 N.m of torque from each wheel endows the HKM-7877331 with real hill-crossing ability, with no chain-driven mid-drive complexity to service.
No Fuel, No Fees
A full charge costs a few cents of electricity and covers more than 37 mi. There is no gas, no oil, and no parking meter at the far end of the ride.
Everyday Practicality
Hydraulic disc brakes, full suspension, fat tires, and a 7-speed drivetrain make this a transport tool, not a toy. The HKM-7877331 carries all of it as standard.
Confident in the Wet
Hydraulic discs modulate cleanly on wet rotors, and the fat tires keep their composure on painted lines and gravel washouts. The bike slows the way you ask, every time.
Aluminum Alloy Frame
The alloy frame keeps the mass where it belongs - low and centered - so a heavy-duty spec sheet still rides light on its feet.
Ready Out of the Box
The HKM-7877331 arrives mostly assembled. Fit the handlebar, charge the pack, and the first ride is minutes away - no shop visit, no special tools.
Ride It Your Way
Pedal with the 7-speed drivetrain, lean on the throttle, or mix both with pedal assist. The bike adapts to the day instead of the other way around.
Full Specifications
Measurements are shown in US customary units first, with metric equivalents in parentheses.
Battery, Range, and Charging
A 20 Ah pack with two motors to feed.
The 48 V 20 Ah pack rides in the down tube, low and centered, and returns more than 37 mi (60 km) per charge. Real-world range depends on how you use the two motors: dual drive spends the pack faster on climbs and headwinds, single drive stretches it. Cold below 40 F trims capacity 10-20 percent, recovering as the pack warms. A full recharge takes a little over 3 hours, so a lunch-break top-up is realistic - no overnight-only charging.
Daily Use & Care
A short weekly routine keeps the ride quiet and the range where it should be.
Tire pressure sets the character of the ride. Run the upper half of the sidewall range on pavement for lower rolling resistance and longer range, and drop toward the lower half on sand and snow so the four-inch casings can flatten and grip.
Wipe the frame and deck with a damp cloth after riding on salted roads or dusty paths. Road film attacks aluminum fasteners over time if it is left in place.
Check the axle hardware, stem clamp, and handlebar bolts before the first ride of each week. Vibration works fasteners loose faster than most riders expect.
Keep the chain lubed and the derailleur clean. A dry chain wears the cassette fast and robs range you paid for.
Inspect disc brake pad thickness monthly. Pads wear silently until they are gone; replace the friction material once it is under 1 mm.
Charge indoors at room temperature and unplug once the charge is complete rather than leaving the bike connected for days at a time.
Keep the charge-port cover closed when the bike is parked outside so moisture stays out of the connector.
Spin both wheels weekly and check that nothing rubs and that the tires seat evenly. Catching a wobble early is a five-minute fix instead of a wheel replacement.
What’s in the Box
Everything needed to get riding, right out of the box.
1 x HKM-7877331 Dual Motor Electric Bike
Arrives mostly assembled; fit the handlebar, straighten the front wheel, and check the brakes
1 x 48 V Charger
Recharges the 20 Ah pack in a little over 3 hours
1 x User Manual
Safety, setup, and care instructions
Controls & Indicators
What each control on the HKM-7877331 does.
Power Button
Hold to switch the system on and off; the display confirms the power state
Throttle
Twist throttle for power on demand, no pedaling required
Drive Mode Switch
Toggle between dual-motor and single-motor drive as the terrain changes
Display
Speed, battery, and assist data in real time on the handlebar readout
Battery Gauge
State-of-charge indicator so you always know the ride you have left
Brake Levers
Hydraulic disc brakes, one lever per hand, firm from the first pull
Lighting
Run the headlight from the main pack for dusk and evening rides
Frequently Asked Questions
Quick answers about the HKM-7877331.
How much assembly is required out of the box?
The bike arrives mostly assembled. What remains is fitting the handlebar, straightening the front wheel, checking tire pressure and brake alignment, and giving the pack a full charge. Budget 30-45 minutes, most of it waiting for the charger.
What range should I actually plan for?
Plan for 37+ mi (60+ km) per charge. Riding dual-motor the whole way, cold weather, heavy loads, and low tire pressure all pull the figure down; single-motor cruising on firm tires pushes it back up.
When should I use dual drive versus single motor?
Dual drive for climbs, sand, snow, and headwinds. Single motor for flat pavement and easy trails, where one 750 W motor is plenty and the range stretches accordingly.
How long does the battery take to charge?
A little over 3 hours with the supplied charger from a fully empty pack - fast enough that a mid-day top-up is practical.
Is a license or registration required?
Rules vary by state and by city. Many US jurisdictions treat e-bikes like bicycles when the motor assist caps near 20 mph, but some require permits or restrict where they may be ridden. Confirm local law before riding on public roads.
Can I pedal it like a normal bike?
Yes. The 7-speed drivetrain works exactly like a conventional bike's, with the motor adding assist or throttle power whenever you ask for it.
Is it waterproof?
The build is water-resistant for everyday splashes and damp pavement, but it is not a submarine. Avoid deep puddles, do not pressure-wash it, and dry the charge port before plugging in.
What can it climb?
With 60-70 N.m from each motor, the HKM-7877331 pulls grades that stall single-motor fat bikes. Expect range to drop on hilly routes; that is normal and recovers on the flats.
Quick Troubleshooting
Common issues and what to check first.
The motor does not engage.
Confirm the power button is on, the pack has charge, and the display is showing data. Check that the battery is clicked fully into place. If it still will not engage, note the conditions and contact support.
Range dropped noticeably compared with when it was new.
Check tire pressure first; a soft tire on pavement is the most common cause. Then consider temperature, because cold reduces available capacity temporarily. Frequent full-throttle starts and hill climbing also pull range down.
The brakes feel weak or the lever pulls to the grip.
Check the pad thickness and cable tension first. Disc brakes bed in over the first rides; if the lever still feels soft after bedding in, adjust the cable or have the caliper checked - do not continue with compromised brakes.
The chain skips under hard pedaling.
Check the derailleur indexing and the chain for wear. A stretched chain skips under load; replacing it in time protects the cassette.
There is a rattle from the front end over bumps.
Check that the axle hardware is tight and the front wheel is seated. Suspension components settle in the first weeks; a persistent knock after a hardware check should be inspected before the ride continues.
The display will not power on.
Confirm the pack has charge and all connectors are seated. Switch the system off, wait 30 seconds, and switch it back on. If the display stays dark, note the conditions and contact support.
Certifications & Standards
Documented design and build, ready for daily service.
Dual 750W Drive
Two brushless hub motors, one per wheel, with rider-selectable dual or single drive.
48V 20Ah Pack
Down-tube lithium pack sized for long dual-motor runs.
Hydraulic Disc Standard
Front and rear hydraulic disc brakes fitted as standard equipment.
Full Suspension
Suspension fork and rear shock standard, tuned for all-terrain duty.
Fat Tire Standard
26 x 4 in tires fitted as standard, street- and trail-ready.
7-Speed Drivetrain
Conventional 7-speed drivetrain for pure pedaling when you want it.
Pre-Ride Safety Checklist
Run through these before every ride.
Check tire pressure and set it for the surface you plan to ride; pressure has more effect on range and grip than any other single adjustment you can make in 30 seconds.
Squeeze both brake levers. They should firm up well before touching the grip, with no sponginess or long lever travel.
Confirm the pack has the charge you expect and the display shows it.
Spin both wheels and check that nothing rubs and the tires seat evenly.
Check that the axle hardware is tight and that there is no play at the handlebar or folding joint when you rock the bike with the front brake applied.
Test the throttle and pedal-assist response at walking pace in a clear, traffic-free area before riding in traffic.
Switch on the headlight if you will be riding near dusk, and wear a helmet rated for the speed this machine reaches.
Confirm the assist level is the one you expect before you set off, so the first throttle input is not a surprise.
Service & Policies
Every HKM-7877331 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 dual-motor e-bike is capped at 15.5 mph (25 km/h) in its street-legal setting. Read the manual first and practise throttle and braking in an open, traffic-free area. Leave extra room for braking, since a loaded fat bike carries real momentum. Wear a helmet every ride. Do not exceed the 265 lb (120 kg) load limit, including rider and cargo. 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 battery or motors. Charge only with the supplied charger, indoors and attended. Never open, puncture, or modify the pack. Slow down substantially on wet surfaces, loose gravel, and steep descents.
HKM-7877331 - dual 750 W brushless hub motors - 48 V 20 Ah lithium-ion - 15.5 mph (25 km/h) - 37+ mi (60+ km) range - 26 x 4 in fat tires - full suspension - hydraulic disc brakes - 7-speed drivetrain - aluminum alloy frame - 265 lb (120 kg) load capacity. 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.
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Manufacturing Defects
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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.
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Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
Unworn or unused, with tags and original packaging.
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A receipt or order number is required.
Fast Refund
Refund processed within 10 business days.
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Returns & Exchanges Overview
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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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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
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Available 24 hours a day, 7 days a week
