High-Speed Dual-Motor Hardtail Fat Bike
HKM-7682643 Electric Fat Bike
The HKM-7682643 combines two brushless hub motors with a combined 2000 W peak output and a 48 V 20 Ah lithium pack (960 Wh) in a 6061 aluminum hardtail fat-bike frame. The dual-motor layout drives both wheels for traction on loose surfaces, while hydraulic disc brakes, a 21-speed drivetrain, and 26 x 4.0 in fat tires make it capable on pavement, gravel, sand, and light snow. It is built for riders who want power and all-terrain versatility.
2000 W Peak Dual-Motor System48 V 20 Ah / 960 Wh Pack31 mph Top Speed26 x 4.0 in Fat TiresHydraulic Disc BrakesHardtail Frame21-Speed Drivetrain330 lb Load Capacity
Motor
2000 W peak
Dual hub motors
Battery
48 V 20 Ah
960 Wh removable lithium
Top Speed
31+ mph
50+ km/h with assist
Range
19-37 mi
31-60 km, varies with assist
Tires
26 x 4.0 in
Fat tread, all-terrain
Load Capacity
330 lb
150 kg rider plus cargo
Overview
The HKM-7682643 uses a dual-motor powertrain with a combined 2000 W peak output. The controller sends power to both hub motors for all-wheel traction, which is useful on loose gravel, sand, snow, and steep grades. The hardtail aluminum frame keeps the package efficient and direct-feeling on pavement.
A 48 V 20 Ah lithium-ion pack stores 960 Wh of energy and is removable for indoor charging. Depending on assist level, terrain, and rider weight, range is typically 19-37 mi. Some variants offer a larger battery; range increases proportionally with capacity.
Hydraulic disc brakes provide the stopping power appropriate for a high-output fat bike, and power-off levers cut motor drive the instant either brake is applied. The 21-speed drivetrain gives you the gear range to climb hills and cruise efficiently.
A backlit LCD display shows speed, battery level, assist mode, trip distance, and odometer. The twist throttle and multiple pedal-assist levels let you choose between effortless power and extended range.
Key Features
2000 W Peak Dual-Motor System
Two brushless hub motors work together to deliver a combined 2000 W peak output. All-wheel-drive traction improves acceleration and control on loose or slippery surfaces.
48 V 20 Ah Lithium Pack (960 Wh)
The down-tube battery stores 960 Wh of energy and is removable for indoor charging. A smart charger refills the pack in 6-8 hours from empty. Some variants include a larger-capacity battery for extended range.
Hardtail Aluminum Frame
The 6061 aluminum hardtail frame is built to handle the torque of dual motors and the 330 lb load rating. The geometry balances high-speed stability with maneuverability.
Hydraulic Disc Brakes With Power Cut-Off
Sealed hydraulic lines provide light, consistent lever feel and strong stopping power. Power-off levers instantly cut motor drive when braking.
21-Speed Drivetrain
A triple chainring and 7-speed Shimano cassette provide 21 gear ratios for climbing, cruising, and descending. Lower gears reduce motor load on hills; higher gears let you contribute power on flats.
26 x 4.0 in All-Terrain Fat Tires
The wide tires distribute weight over a large contact patch for flotation on sand and snow while improving grip and comfort on gravel and wet pavement.
LED Headlight and Integrated Tail-Light
A bright LED headlight and brake-activated tail-light improve visibility without separate batteries.
Rear Rack and Fender Mounts
The frame includes mounts for a rear rack and fenders, making the bike practical for commuting and light cargo within the 330 lb load rating.
Full Specifications
Model
HKM-7682643 | Electric Fat Bike
Frame Material
6061 aluminum alloy, hardtail fat-bike geometry
Motor
2000 W peak dual brushless hub motors
System Voltage
48 V DC
Battery
48 V 20 Ah lithium-ion (960 Wh), removable and lockable; larger variants available
Charger
2 A smart charger, 100-240 V input
Charging Time
6-8 hours from empty for 20 Ah pack
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
31+ mph (50+ km/h)
Range per Charge
19-37 mi (31-60 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 30 degrees with a solo rider
Peak Torque
Approximately 90 N.m combined
Drivetrain
21-speed Shimano derailleur with index shifters
Brakes
Hydraulic disc brakes, front and rear, with power-off levers
Suspension
Rigid rear triangle with lockable front suspension fork
Tires
26 x 4.0 in fat tires, all-terrain tread
Wheels
26 in alloy rims, stainless spokes
Saddle
Wide sport saddle with quick-release seat post
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with multiple pedal-assist levels
Lighting
LED headlight and tail-light, powered by main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 74 lb (34 kg) including battery
Recommended Rider Height
5 ft 4 in to 6 ft 4 in (163-193 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V 20 Ah pack stores 960 Wh of energy. Dual motors draw more power than a single motor, but the 960 Wh capacity supports real-world range of 19-37 mi depending on assist level and terrain. Some variants ship with a larger battery; range scales proportionally with capacity.
Cold weather below 40 F (4 C) temporarily reduces available capacity. The battery management system protects against overcharge, deep discharge, and short circuits.
Tip: Store the pack at 30-70 percent charge if the bike will sit unused for more than a month. Charging indoors at room temperature extends pack life.
The pack unlocks with the supplied key and lifts out of the down tube. You can also charge it in place through the frame-side port.
Daily Use & Care
- Run 15-20 psi on pavement; drop to 8-12 psi for sand, snow, or loose gravel.
- Rinse the frame, rims, and drivetrain after riding on salted roads or wet gravel.
- Check axle nuts and stem bolts weekly; dual-motor torque works fasteners loose over time.
- Wipe and re-lubricate the chain every 100-150 mi, or after wet or dusty rides.
- Inspect brake pad thickness monthly and replace when friction material is under 1 mm.
- Charge indoors at room temperature and 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
- 1 x HKM-7682643 electric fat bike, approximately 85 percent pre-assembled
- 1 x 48 V 20 Ah removable lithium battery pack (or variant ordered)
- 1 x 2 A smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of platform pedals
- 1 x User manual and assembly guide
Frequently Asked Questions
How much assembly is required out of the box?+
The bike ships about 85 percent assembled. Remaining steps are fitting the front wheel, bolting the handlebar, installing the pedals and seat, and checking brake alignment. Budget 30-45 minutes.
What is the real-world range?+
Plan for 19-37 mi depending on assist level and terrain. Throttle-only riding at high speed lands near the lower end; moderate pedal-assist extends it. A larger battery variant increases range.
Is a license or registration required?+
Regulations vary by jurisdiction. A 2000 W peak dual-motor bike with a 31+ mph top speed may exceed standard e-bike limits in some areas. Check local laws before riding on public roads.
How long does the battery take to charge?+
About 6-8 hours from fully empty for the 20 Ah pack. Larger packs take proportionally longer.
Can I ride it in the rain or snow?+
Light rain and snow are fine, but avoid submersion and deep water. Dry the bike and charge port after wet rides.
Can I pedal it without motor assistance?+
Yes. The 21-speed Shimano drivetrain works independently. Unassisted pedaling is slower due to weight, but it is possible on flat ground.
How does the dual-motor system work?+
The controller distributes power to both hub motors for all-wheel traction. On firm ground it may bias power toward the rear; on loose surfaces both wheels share the load.
Is the battery removable for indoor charging?+
Yes. It unlocks with the supplied key and lifts out of the down tube.
Service & Policies
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.
CERoHSUN38.3 Battery960 Wh PackHydraulic BrakesDual Motor21-Speed
Why Choose the HKM-7682643
Dual-Motor Traction on Loose Surfaces
Powering both wheels reduces wheel spin on gravel, sand, snow, and mud, helping you maintain control where a single-drive bike would struggle.
High Output for Hills and Loads
The combined 2000 W peak output provides the torque needed for steep climbs and heavier payloads, while the 21-speed drivetrain optimizes cadence.
Hydraulic Brakes Matched to the Power
Hydraulic disc brakes maintain consistent lever feel and stopping power even during repeated hard stops or wet conditions.
Hardtail Efficiency and Simplicity
A rigid rear triangle transfers power directly to the rear wheel and reduces maintenance compared with full-suspension designs.
Fat Tires for All-Season Use
26 x 4.0 in tires handle pavement, gravel, sand, and light snow, so you are not limited to fair-weather riding.
Cargo and Commute Ready
Mounting points for a rear rack and fenders let you adapt the bike for commuting, errands, and light touring.
Controls & Indicators
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 pedal-assist levels
Twist Throttle
Right-hand grip; proportional response, works independently of 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 tail-light
Shifters
Left-hand front derailleur and right-hand Shimano rear derailleur shifters for 21 speeds
Pre-Ride Safety Checklist
- Check tire pressure and set it for the terrain: 15-20 psi for pavement, 8-12 psi for sand/snow/gravel.
- Squeeze both brake levers. They should firm up before reaching the grip, with no sponginess.
- Confirm the battery is seated and locked, and that the display shows the expected state of charge.
- Spin both wheels and check that nothing rubs the brake pads or frame.
- Verify axle nuts and stem bolts are tight, and that the headset has no play.
- Test the throttle and dual-motor response at walking pace in a clear area before riding in traffic.
- Switch on the headlight and tail-light if riding near dusk, and wear a helmet.
- Check that any cargo is secured and within the 330 lb total load limit.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the display is on, the battery is locked into place, and both brake levers are fully released. Brake cut-off sensors disable the motor while a lever is pulled.
Range dropped noticeably compared with when it was new.+
Check tire pressure and temperature effects. If range remains down more than 30 percent year-round after many cycles, the pack may be near end of life.
The brakes feel spongy at the lever.+
Sponginess usually indicates air in the hydraulic line or a fluid leak. Have the system bled and inspected before riding at speed.
The chain skips under hard pedaling.+
The derailleur indexing is likely out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time.
One wheel feels like it is not getting power.+
Check the motor connectors and axle nuts on both wheels. If the issue persists, contact support for controller diagnostics.
The display shows an error code.+
Power the system off, wait 30 seconds, and switch it back on. If the code returns, note it and contact support.
Certifications & Standards
The HKM-7682643 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and assembled pack carry the test documentation normally required for lithium-ion transport and sale.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing for lithium-ion shipping.
- MSDS - Material Safety Data Sheet available for the battery pack on request.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is a high-output electric fat bike capable of 31+ mph. Read the manual fully before the first ride and practice throttle response in an open area. Dual motors can produce strong acceleration, especially on loose surfaces; use smooth throttle inputs.
- Wear a helmet on every ride.
- Do not exceed the 330 lb (150 kg) load capacity, including rider and cargo.
- Check local law before riding on public roads or paths.
- Bed in the brake pads with 10-15 progressive stops during the first few rides.
- Do not ride through water deep enough to reach the hub motors or battery.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface.
- Do not attempt to open, puncture, or modify the battery pack.
- Reduce speed on gravel, wet surfaces, and downhill grades.
HKM-7682643 · 2000 W peak dual brushless hub motors · 48 V 20 Ah lithium (960 Wh) · 31+ mph top speed · 19-37 mi range · 26 x 4.0 in fat tires · 330 lb (150 kg) load capacity · 6061 aluminum hardtail frame · hydraulic disc brakes · 21-speed Shimano drivetrain. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. This page describes the product only and is not legal advice regarding vehicle classification.
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We are confident that our products are of great quality and even better value. However, if upon receiving and inspecting your item you decide that you want to return it, you will have 30 days as of the date of shipment arrival to return it for a refund minus the shipping cost. No restocking charges. Any additional fees associated with a purchase transaction will be deducted from the amount of the refund.
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If you purchase products from our website, you have 24 months to request repairs or replacement if any products turns out to be faulty or are not as advertised. During the warranty period if any product is found to have a manufacturer defect, we will repair or replace the defective part(s). If a product cannot be repaired or replaced within a reasonable time, you can request a refund or price reduction. We are confident that our products are of great quality and even better value. However, if upon receiving and inspecting your item you decide that you want to return it, you will have 30 days as of the date of shipment arrival to return it for a refund minus the shipping cost.
