High-Torque Off-Road Electric Bike
HKM-496851 Off-Road Electric Bike
The HKM-496851 is built for riders who leave the pavement behind. A 2000 W geared hub motor produces 85 N.m of torque for steep, loose climbs, and a 48 V 20 Ah pack stores 960 Wh for long trail days. The 20 x 4.0 in fat tires float over sand and snow, a hydraulic coil fork with 80 mm travel absorbs the hits, and dual hydraulic disc brakes with 180 mm rotors provide strong, consistent stops. A 3.5 in color LCD with USB-C, five assist levels, walk mode, and a thumb throttle round out a bike that is weather-sealed to IP65.
2000 W Geared Hub (85 N.m)48 V 20 Ah / 960 Wh37 mph Top Speed20 x 4.0 in Fat TiresFront Suspension ForkHydraulic Disc Brakes330 lb Load CapacityIP65 Weather-Sealed
Motor
2000 W
geared hub, 85 N.m torque
Battery
48 V 20 Ah
960 Wh removable lithium
Top Speed
37 mph
60 km/h, off-road mode
Range
40-65 mi
64-105 km PAS; 25-35 mi throttle
Tires
20 x 4.0 in
puncture-resistant fat tread
Load Capacity
330 lb
150 kg rider plus cargo
Overview
The HKM-496851 is built around a 6061 aluminum frame with internal cable routing and a low, balanced center of gravity from the down-tube battery. The geometry is tuned for off-road stability at speed and agility through tight singletrack, while the upright bar keeps the rider in control on technical sections.
Underneath is a high-torque drivetrain: a 2000 W geared hub motor rated for 85 N.m pulls up grades as steep as 35 degrees without pedaling, fed by a 20 Ah pack that stores 960 Wh. A thumb throttle gives instant power; five pedal-assist levels and a walk mode let you meter effort and extend range on long rides.
Real-world range is wide because the bike adapts to how you ride. Pure-throttle riding on flat terrain returns 25-35 mi. Moderate pedal- assist on the same terrain regularly returns 40-65 mi. Cold weather, soft tires, a heavy load, and steep terrain all reduce those numbers; warmer months and firmer tires push them back up.
Comfort and control hardware matches the power. An 80 mm hydraulic coil fork with preload and lockout smooths rough ground, dual 180 mm hydraulic disc brakes with motor cut-off provide strong stops, and the fat tires add a layer of pneumatic suspension. The IP65 rating means the bike shrugs off rain, splashes, and muddy trails.
Key Features
2000 W Geared Hub Motor (85 N.m)
A 2000 W geared hub motor produces up to 85 N.m of torque for strong, immediate acceleration and sustained climbing power. Its heat-dissipating alloy casing and sealed bearings allow continuous high-load operation without overheating, and the sine-wave controller keeps the ride quiet.
48 V 20 Ah Lithium Pac (960 Wh), IP65
The removable pack slides into a lockable, IP65-rated case in the down tube. 960 Wh is enough for long trail days. A 3 A fast charger refills from empty in 4-6 hours, and the BMS protects against overcharge, over-discharge, short circuits, and temperature extremes.
Front Hydraulic Coil Fork, 80 mm Travel
A hydraulic coil-spring fork with 80 mm of travel, preload adjustment, and lockout smooths roots, potholes, and drop-offs. Dial in stiffness for your weight, lock it out on smooth pavement, or open it up for the rough stuff. Hard-anodized stanchions resist scratching.
Dual Hydraulic Disc Brakes, 180 mm Rotors
Mineral-oil hydraulic brakes with 180 mm rotors front and rear deliver progressive, powerful stopping with excellent modulation. Motor cut-off switches in the levers disengage power the instant you squeeze, and the sealed system needs minimal maintenance in all temperatures.
5-Level Pedal Assist, Walk Mode, Thumb Throttle
Switch between five assist levels plus a walk mode through the display, and use the left-grip thumb throttle for instant full power without pedaling. A cadence sensor engages the motor smoothly so the bike feels natural whether you pedal or not.
20 x 4.0 in Puncture-Resistant Fat Tires
Multi-layer puncture-resistant fat tires with aggressive, siped knobs grip wet roots, mud, and off-camber surfaces. Run as low as 8 psi for maximum footprint on sand or snow, or 20 psi for hardpack efficiency.
LED Headlight, Brake Light, and USB-C
A 200-lumen headlight with a wide beam and a rear brake light run off the main battery and are controlled from the display. The 3.5 in color LCD also provides a USB-C port to charge your phone or GPS on the go.
Reinforced Rear Rack and Utility Mounts
A reinforced rear rack (optional) and stout frame carry cargo, camping gear, or a passenger within the 330 lb rating, making the bike a true utility workhorse for off-road and utility use alike.
Full Specifications
Model
HKM-496851 | Off-Road Electric Bike
Frame Material
6061 aluminum alloy, internal cable routing
Motor
2000 W brushless geared hub motor, 85 N.m torque
System Voltage
48 V DC
Battery
48 V 20 Ah lithium-ion (960 Wh), removable, IP65 case
Charger
3 A smart charger, 100-240 V input
Charging Time
4-6 hours from empty
Battery Cycle Life
Up to 800 charge cycles while maintaining 70 percent capacity
Top Speed
37 mph (60 km/h), off-road mode
Range Per Charge
40-65 mi (64-105 km) PAS; 25-35 mi (40-56 km) throttle
Climbing Grade
Up to approximately 35 degrees without pedal input
Peak Torque
85 N.m
Drivetrain
5-level pedal assist + walk mode, cadence sensor
Brakes
Hydraulic disc brakes, 180 mm rotors, motor cut-off
Suspension
Front hydraulic coil fork, 80 mm travel, preload and lockout
Tires
20 x 4.0 in puncture-resistant fat tires
Wheels
20 in alloy rims, stainless spokes
Saddle
Vented, gel-padded saddle with ergonomic lock-on grips
Display
3.5 in color LCD, USB-C charging port, speed/battery/mode/wattage
Throttle
Thumb throttle (left grip), 5 PAS levels + walk mode
Lighting
200-lm LED headlight, rear brake light, powered by main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
79 lb (35.8 kg) including battery
Recommended Rider Height
5 ft 4 in to 6 ft 4 in (163-193 cm, estimated)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V 20 Ah pack stores 960 Wh of energy in a lockable, IP65-rated case that slides into the down tube for a low center of gravity. A smart BMS safeguards against overcharge, over-discharge, short circuits, and temperature extremes, and prolongs cycle life up to 800 charges while keeping at least 70 percent capacity.
Real-world range depends on how much you pedal, rider and cargo weight, tire pressure, and terrain. Pure-throttle riding on flat terrain returns 25-35 mi. Moderate pedal-assist on the same terrain regularly returns 40-65 mi. Cold weather below 40 F (4 C) temporarily reduces available capacity; it returns once the pack warms up.
Tip: Store the pack at 50-80 percent charge in a cool, dry place if not used for weeks. Avoid fully depleting it regularly - partial discharges extend cycle life. The BMS stops charging when full, so leaving it plugged in overnight does no harm.
The pack unlocks with the supplied key and lifts out of the down tube in a few seconds for indoor charging. A 5-bar LED on the pack shows remaining charge even when removed. Charging in place through the frame-side port works equally well.
Daily Use & Care
- Tire pressure sets the character of the bike. Run 8-12 psi for sand, snow, and loose gravel; 18-20 psi for hardpack and pavement.
- Rinse the frame, rims, and drivetrain with fresh water after every muddy or wet ride to protect the IP65 seals and fasteners.
- Check that both axle nuts and the stem bolts are torqued before the first ride of each week. Hub-motor torque works fasteners loose faster than on a conventional bicycle.
- 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. Hydraulic pads wear silently until they are gone; replace when the friction material is under 1 mm.
- Charge indoors at room temperature with the supplied 3 A charger, and unplug once the indicator turns green.
- Keep the display and charge port covers closed when parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-496851 off-road electric bike, approximately 85 percent pre-assembled
- 1 x 48 V 20 Ah removable lithium battery pack (IP65 case)
- 1 x 3 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 folding pedals
- 1 x Front and rear lighting set (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
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. Have a bike shop check torque and brake bedding if you are not comfortable doing it yourself.
What is the actual top speed on flat ground?+
The HKM-496851 reaches 37 mph (60 km/h) in off-road mode with a fully charged battery, throttle only on level pavement. Rider weight and wind cause slight variations. Many regions limit e-bike speeds on public roads, so check local laws.
How does the pedal assist feel compared to a regular bike?+
The five-level assist is tuned to feel natural. Level 1 gives a gentle boost; level 5 delivers strong acceleration with each pedal stroke. The cadence sensor engages smoothly without jerking, and you can ride throttle- only, completely independent of pedaling.
Can I ride this bike in the rain or through puddles?+
Yes. The battery, motor, and display are IP65 rated against dust and low-pressure water jets, so the bike handles rain, splashes, and muddy trails. Avoid submerging the motor or battery, and dry the chain after wet rides to prevent rust.
What terrain can the fat tires handle?+
The 20 x 4.0 in tires excel on sand, snow, loose gravel, hardpack, pavement, and rocky singletrack. Aired down to 8-10 psi the large contact patch floats over soft surfaces, and the aggressive tread bites in mud.
Is a license or registration required?+
Rules vary by country and state. In many US states a 2000 W bike that exceeds 20 mph on throttle may be classified as a moped or off-road vehicle. The HKM-496851 is designed primarily for off-road and private land use; verify local laws before any public-road riding.
How long does the battery take to charge?+
About 4-6 hours from fully empty with the supplied 3 A charger. Partial top-ups take proportionally less time; there is no need to run the pack down before recharging.
Is the battery removable for indoor charging?+
Yes. It unlocks with the supplied key and lifts out of the down tube. You can also charge it in place through the frame-side charge port.
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 BrakesIP65 Rated2-Yr Warranty
Why Choose the HKM-496851
Climbs Where Others Stop
An 85 N.m geared hub motor and a 35-degree climbing rating mean the HKM-496851 powers up loose, steep ascents that leave lesser bikes walking. Thumb throttle gives instant traction when the grade bites.
Built for the Rough Stuff
An 80 mm hydraulic coil fork, 20 x 4.0 in fat tires, and 180 mm hydraulic disc brakes make roots, whoops, sand, and snow rideable. The bike stays composed instead of skittish when the surface breaks up.
Ride It Your Way
Thumb throttle for instant power, five assist levels for efficient pedaling, and a walk mode for moving the bike by hand. Mix them to match terrain, battery, and mood on the same ride.
Sealed and Quiet
The sine-wave controller and sealed geared hub keep the ride quiet, while the IP65 rating shrugs off rain and mud. You hear the trail, not the drivetrain.
All-Day 960 Wh Pac
A 960 Wh pack runs well above the commuter norm, so you can ride long trail loops or run a throttle-heavy commute without constant charging stops. The energy headroom also helps when carrying a load.
Utility Workhorse
A reinforced rear rack, stout frame, and IP65 sealing make the bike as happy hauling cargo on a rainy commute as it is carving singletrack. It is built for daily use, not just weekends.
Controls & Indicators
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Buttons
Display buttons cycle through 5 pedal-assist levels, walk mode, and readouts
Thumb Throttle
Left-grip thumb throttle; full power on demand, independent of pedaling
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Charge indicator plus percentage readout on the color LCD
Light Switch
Toggle the LED headlight and integrated brake light from the display
Shifter
Right-hand index shifter for the rear derailleur (where fitted)
Pre-Ride Safety Checklist
- Check tire pressure and set it for the terrain: 8-12 psi for sand, snow, or loose gravel; 18-20 psi for hardpack.
- Squeeze both brake levers. They should firm up well 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 the rims run true and nothing rubs the brake pads or the frame.
- Verify the axle nuts are tight and the headset has no play when you rock the bike with the front brake applied.
- Test the throttle at walking pace in a clear area before riding technical trail or at full speed.
- Switch on the headlight and tail light if riding near dusk, and wear a helmet rated for the speeds this bike reaches.
- If carrying cargo or a passenger, confirm total weight is under 330 lb and the load is secured before riding.
Quick Troubleshooting
The motor does not engage when I use the throttle or pedals.+
Confirm the display is on and shows charge, the battery is locked into place, and both brake levers are fully released - brake cut-off switches disable the motor while a lever is pulled. 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; a soft tire on pavement is the most common cause. Then consider temperature - cold reduces available capacity temporarily. 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. Do not continue riding a 37 mph bike on compromised brakes.
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 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 feels too soft or too hard.+
Use the preload adjuster to tune the 80 mm coil fork for your weight and terrain, and use lockout on smooth pavement. If it still bottoms out on moderate hits, have a shop check the seal and valve for wear.
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 the conditions that produced it, then contact support - error codes map to specific faults in the controller, motor, or throttle circuits.
Certifications & Standards
The HKM-496851 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and the assembled pack carry the test documentation normally required for lithium-ion transport and sale, and the electrical assembly is built to CE and RoHS requirements.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- 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 off-road electric bike capable of 37 mph. Read the manual fully before the first ride and practice throttle control in an open, traffic-free area until the response feels predictable. The bike is designed primarily for off-road and private-land use.
- Wear a helmet on every ride. At 37 mph a bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the 330 lb (150 kg) load capacity, which includes the rider, any passenger, and cargo.
- Check local law before riding on public roads or paths. A 2000 W motor with 37 mph top speed may place this vehicle outside standard e-bike classifications in your area.
- Bed in the brake pads with 10-15 progressive stops during the first few rides before riding at full speed or with a load.
- Do not ride through water deep enough to reach the hub motor or the battery compartment, even though the bike is IP65 rated.
- Charge only with the supplied charger, indoors, at room temperature, and on a non-flammable surface. Do not leave a charging battery unattended overnight.
- Do not attempt to open, puncture, or modify the battery pack. Damaged lithium packs can vent and ignite.
- Reduce speed substantially on sand, wet surfaces, and steep downhill grades; fat tires add grip but do not eliminate the risk of losing traction.
HKM-496851 · 2000 W geared hub motor (85 N.m) · 48 V 20 Ah lithium (960 Wh) · 37 mph top speed · 40-65 mi range (PAS) · 20 x 4.0 in fat tires · 330 lb (150 kg) load capacity · 6061 aluminum frame · 80 mm front suspension · hydraulic disc brakes · IP65. 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 - confirm local regulations before riding on public roads.
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