1500 W All-Terrain Fat-Tire Electric Bike
HKM-890067 Electric Fat Bike
The HKM-890067 is built for the routes that a normal commuter bike quietly refuses: sandy shortcuts, snowed-in bike paths, gravel access roads, and broken city tarmac. A 1500 W brushless rear hub motor and a removable 48 V 18 Ah pack (864 Wh) provide 25-37 mi of range and a ceiling of 31 mph in Sport mode. Underneath, 20 x 4.0 in fat tires float over soft ground, hydraulic disc brakes with 180 mm rotors bring it back down, and a reinforced steel frame carries up to 330 lb of rider and cargo.
1500 W Brushless Hub Motor48 V 18 Ah / 864 Wh Pack19-31 mph Top Speed25-37 mi Range20 x 4.0 in Fat TiresHydraulic Disc, 180 mm Rotors7-Speed Drivetrain330 lb Load Capacity
Motor
1500 W
Rated brushless rear hub
Battery
48 V 18 Ah
864 Wh removable lithium
Top Speed
19-31 mph
30-50 km/h, mode dependent
Range
25-37 mi
40-60 km, varies with assist
Tires
20 x 4.0 in
Puncture-resistant fat tread
Load Capacity
330 lb
150 kg rider plus cargo
Overview
The starting point for the HKM-890067 is the tire. At 4.0 in wide on a 20 in wheel, the casing runs at pressures as low as 5 psi and spreads the weight of bike, rider, and cargo across a contact patch several times larger than a conventional city tire. That is what stops the wheel sinking into sand, cutting through fresh snow, or washing out on loose gravel. On tarmac the same volume of air acts as suspension, taking the edge off expansion joints and pothole rims without any mechanical linkage to service.
Driving those wheels is a 1500 W rated brushless DC hub motor. Electronic commutation means no brushes to wear, no sparking, and very little audible noise. The controller is mapped for a progressive power curve rather than an on-off surge, which matters more on loose surfaces than raw wattage does: a sudden torque spike breaks traction, a smooth ramp does not. Five pedal-assist levels set how much help you get while pedalling, and a thumb throttle delivers power on demand when you need to clear an obstacle or pull into traffic.
Energy comes from a 48 V 18 Ah lithium pack storing 864 Wh in an IP65-rated case that resists dust and water spray. It locks to the frame with a key and lifts out for indoor charging, or charges in place through the frame port. Expect around 37 mi (60 km) with moderate pedalling on level ground, and about 25 mi (40 km) when the route involves soft sand, hills, or heavy throttle use. A full charge takes 8-10 hours on the supplied smart charger.
The frame is reinforced high-tensile steel rather than aluminum - heavier, but naturally damping and forgiving of the shock loads a fat bike takes off-road. Welds are double-pass and the finish is a corrosion-resistant powder coat. Geometry puts the rider upright to reduce strain on the lower back and wrists, with a padded saddle and an adjustable stem to suit heights from 5 ft 4 in to 6 ft 4 in. Rated payload is 330 lb (150 kg), and frame bosses accept a rear rack and fenders.
Key Features
1500 W Brushless Rear Hub Motor
A maintenance-free brushless DC motor laced into the rear wheel. Without brushes there is nothing to wear out or spark, so efficiency stays high and the drive is close to silent. The controller ramps power in smoothly from a standstill - a deliberate choice for a bike that spends time on sand and gravel where an abrupt torque spike would simply spin the wheel.
48 V 18 Ah Removable Lithium Pack (864 Wh)
The cells sit in an IP65-rated case that resists dust and water spray. The pack locks to the frame with a key and lifts out in seconds, so you can carry it indoors to charge while the bike stays locked outside. The battery management system balances cells during charging and guards against overcharge, deep discharge, and short circuit. Full charge takes 8-10 hours.
Front Suspension Fork and High-Volume Air Cushion
A suspension fork handles the sharp impacts at the front wheel, while the sheer air volume in the 4.0 in tires damps everything smaller. Running the rear tire at 8-12 psi off-road gives most of the comfort of a rear shock without the weight, the pivots, or the servicing that a full-suspension frame would add.
Hydraulic Disc Brakes with 180 mm Rotors
Sealed hydraulic lines drive both calipers onto 180 mm stainless rotors. The larger rotor diameter is there for heat: a loaded fat bike descending a long grade puts real energy into the brakes, and a bigger disc sheds it without fading. The system self-adjusts for pad wear, so there is no cable to re-tension every few weeks.
7-Speed Wide-Ratio Drivetrain
A 7-speed rear cassette with a single chainring and an indexed thumb shifter. Low gears let you contribute on a climb even at low assist; the top gears keep your cadence usable near the 31 mph ceiling instead of spinning out. A chain guide keeps the chain on the ring over rough ground.
20 x 4.0 in Puncture-Resistant Fat Tires
Wide, high-volume casings with a knobby tread that sheds mud and grips on off-camber ground. Pressure range is roughly 5-30 psi: soft for float over sand and snow, firm for low rolling resistance on tarmac. Reflective sidewall stripes add a lit outline from the side at night.
Integrated LED Headlight and Multi-Mode Rear Light
Both lights run from the main pack, so there are no separate cells to keep charged. The headlight throws a wide beam for unlit paths; the rear light works as a steady glow or a flashing alert. Combined with the reflective tires and pedal reflectors, the bike is visible from every angle.
Reinforced Steel Frame with Rack and Fender Bosses
A double-pass welded, powder-coated high-tensile steel frame rated to 330 lb (150 kg) including rider and cargo. The reinforced rear triangle and heavy-duty spokes carry that load without flex, and integrated bosses accept a rear rack and full fenders for commuting duty (accessories sold separately).
Full Specifications
Model
HKM-890067 | Electric Fat Bike
Frame Material
Reinforced high-tensile steel, step-over geometry, powder coated
Motor
1500 W rated brushless DC rear hub motor
System Voltage
48 V DC
Battery
48 V 18 Ah lithium-ion (864 Wh), removable and lockable, IP65 case
Charger
Smart charger, standard AC outlet, overcharge protection
Charging Time
8-10 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
19-31 mph (30-50 km/h), electronically limitable
Range Per Charge
25-37 mi (40-60 km), varies with assist level, terrain, and rider input
Ride Modes
Eco mode for maximum distance; Sport mode unlocks the full 31 mph ceiling
Assembly
Ships approximately 85 percent assembled; 30-45 minutes with the supplied tools
Drivetrain
7-speed rear cassette, single chainring, indexed thumb shifter, chain guide
Brakes
Hydraulic disc brakes front and rear, 180 mm stainless rotors
Suspension
Front suspension fork plus high-volume fat-tire cushioning
Tires
20 x 4.0 in puncture-resistant fat tires, 5-30 psi, reflective sidewalls
Wheels
20 in rims with heavy-duty spokes, reinforced rear triangle
Saddle
Wide padded saddle with adjustable handlebar stem
Display
Backlit handlebar LCD: speed, battery state of charge, trip odometer, assist level
Throttle
Thumb throttle plus 5 levels of pedal assist
Lighting
LED headlight and multi-mode rear light, powered by the main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 70 lb (32 kg) including battery
Recommended Rider Height
5 ft 4 in to 6 ft 4 in (162-193 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested; IP65-rated battery case
Battery, Range, and Charging
The 48 V 18 Ah pack holds 864 Wh. Cells are arranged to balance weight against capacity and housed in a rugged IP65-rated case, so dust and rain spray are not a concern on a bike that will spend time on wet trails. The built-in battery management system monitors individual cell voltages, pack temperature, and discharge current, balances the cells during charging, and protects against overcharge, deep discharge, and short circuit.
Range is a function of how you ride more than anything printed on a spec sheet. With moderate pedal input on level ground the pack returns close to 37 mi (60 km). Soft sand, steep gradients, and continuous throttle use bring that down to around 25 mi (40 km). Eco mode stretches the upper end further; Sport mode, which unlocks the full 31 mph ceiling, shortens it. Cold weather temporarily reduces available capacity, and it returns once the pack warms up.
Tip: Watch the backlit display rather than guessing. Because it shows state of charge alongside trip distance, you can see your consumption rate early in a ride and drop an assist level before range becomes a problem rather than after.
The pack can be charged on or off the bike. Unlock it with the supplied key and take it indoors, or plug into the frame-side port and leave the bike where it stands. A full charge takes 8-10 hours, which suits overnight charging on a standard household outlet; the smart charger stops automatically when the cells reach full voltage.
Daily Use & Care
- Set tire pressure for the surface: 20-30 psi on tarmac for lower rolling resistance, 8-12 psi on sand, snow, or loose gravel so the casing can flatten and float.
- Rinse salt, sand, and mud off the frame, rims, and drivetrain after wet or coastal rides. Grit trapped around the disc calipers wears pads quickly.
- Lubricate the chain every 100-150 mi and after any ride through water or deep dust, wiping the excess off so it does not attract grit.
- Check the axle nuts and stem bolts weekly. Hub-motor torque works fasteners loose faster than pedal power alone ever would.
- Inspect brake pad thickness monthly and replace before the friction material drops under 1 mm. Hydraulic pads wear silently.
- Charge indoors at room temperature and unplug once the charger indicates full rather than leaving it connected for days on end.
- Keep the battery lock and the charge port cover closed when the bike is parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-890067 electric fat bike, approximately 85 percent pre-assembled
- 1 x 48 V 18 Ah removable lithium battery pack (864 Wh)
- 1 x Smart charger for standard AC outlet
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of pedals with reflectors
- 1 x Front LED headlight (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
What is the actual top speed?+
The motor will take the bike to between 19 and 31 mph (30-50 km/h) depending on the assist level selected, rider weight, terrain, and any local speed limit programmed into the controller. Sport mode unlocks the full 31 mph ceiling; the speed can also be electronically limited to comply with regional e-bike rules.
How far will one charge take me?+
Typical range is 25-37 mi (40-60 km). Eco mode with moderate pedalling on level ground puts you at the top of that band. Heavy throttle use, steep hills, soft sand, and low tire pressure push you toward the bottom of it.
Can I take the battery off to charge it?+
Yes. The pack unlocks with the supplied key and lifts off the frame, so you can charge it at a desk or indoors while the bike stays locked outside. It also charges in place through the frame-side port. A full charge takes 8-10 hours on the supplied smart charger.
Is it genuinely capable off-road?+
On sand, snow, mud, gravel, and hardpack trails, yes - that is what the 4.0 in tires and the 1500 W motor are for, and the hydraulic brakes give you the control to descend safely. It is not designed for jumps or extreme downhill riding; the frame and fork are built for all-terrain touring, not for repeated big impacts.
Does it have pedal assist as well as a throttle?+
Both. Five levels of pedal assist scale how much the motor contributes while you pedal, and a thumb throttle gives power on demand without pedalling at all. You can ride on throttle alone, assist alone, or any mix of the two.
What is the maximum rider weight?+
The rated capacity is 330 lb (150 kg) including the rider and any cargo. The reinforced steel frame, heavy-duty spokes, and strengthened rear triangle are specified for that load; staying within it keeps handling predictable and protects the wheels.
How much assembly is needed?+
The bike arrives approximately 85 percent assembled. What remains is fitting the front wheel, aligning and bolting the handlebar, installing the pedals and saddle, and checking brake alignment - about 30-45 minutes with the included tools. If you are unsure about brake or torque settings, have a bike shop check the bike over.
Can I ride it in the rain?+
The electrical components are IP65 rated against dust and low-pressure water jets, so riding in rain is within normal use. Do not submerge the motor or the battery, do not ride through water deep enough to reach the hub, and do not pressure-wash the bike.
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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 BatteryIP65 Pack864 Wh PackHydraulic Brakes330 lb Load
Why Choose the HKM-890067
One Bike for Pavement and Everything Past It
Most e-bikes make you choose between a road-biased commuter and a trail machine. Adjusting tire pressure between 8 and 30 psi effectively converts this one from a beach-and-snow float into a firm-rolling city bike in the time it takes to use a pump.
Float, Not Grip Alone
On soft ground the advantage of a 4.0 in tire is not extra tread - it is that the wheel stays on top of the surface instead of digging into it. Sand, fresh snow, and loose gravel stop being obstacles and become ordinary riding surfaces.
Progressive Power, Not a Switch
The controller mapping ramps torque in rather than dumping it. On loose surfaces that is the difference between accelerating and simply spinning the rear wheel, and it makes the 1500 W output usable by riders who are new to this level of power.
Brushless and Almost Silent
Electronic commutation removes the brushes that wear, spark, and buzz in older motor designs. The result is a drive you can hold a conversation over, with nothing in the motor that needs routine servicing.
Steel That Takes the Hit
Aluminum is lighter, but high-tensile steel damps vibration naturally and accepts the shock loads of off-road use without the fatigue concerns of a thin-wall alloy tube. For a heavy, high-payload fat bike, it is the more sensible material.
Rated for Weather, Not Just Dry Days
An IP65 battery case, sealed connectors, and hydraulic lines that cannot corrode like cables mean the bike keeps working through a wet winter. That is what separates a year-round commuter from a fair-weather purchase.
Controls & Indicators
Power Button
On the battery pack; hold to switch the system on and off
Assist Buttons
Up and down buttons cycle through 5 pedal-assist levels plus zero assist
Thumb Throttle
Left-hand thumb lever; delivers power on demand independently of the assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Segmented state-of-charge indicator on the backlit display
Light Switch
Long-press the up button to toggle the LED headlight and rear light
Shifter
Indexed thumb shifter for the 7-speed rear cassette
Pre-Ride Safety Checklist
- Set tire pressure for the terrain you plan to ride: 20-30 psi for tarmac, 8-12 psi for sand, snow, or loose gravel.
- Pull both brake levers. They should firm up well before the grip, with no sponginess that would suggest air in the hydraulic line.
- Confirm the battery is seated, locked, and showing the state of charge you expect on the display.
- Spin both wheels and check that the rims run true and that nothing rubs the pads or the frame.
- Check the axle nuts, stem bolts, and seat clamp are tight, and that the headset has no play when you rock the bike with the front brake on.
- Confirm the chain sits cleanly on the chainring and shifts across all 7 cogs without hesitation.
- Test the thumb throttle at walking pace in a clear area before riding in traffic or on a loose surface.
- Switch on the headlight and rear light for dusk or night riding, and wear a helmet rated for the speeds this bike reaches.
Quick Troubleshooting
The motor does not respond to the throttle.+
Check the display is on and showing charge, the battery is locked into place, and both brake levers are fully released - the brake cut-off sensors disable the motor while a lever is pulled. If the display shows an error code, note it and contact support.
Range is much shorter than 25 mi.+
Start with tire pressure - a soft fat tire on tarmac is by far the most common cause and can cost a third of the range on its own. Then look at ambient temperature, assist level, and how much you are using the throttle. Persistent short range after many charge cycles points to an ageing pack.
The brake lever pulls close to the grip.+
A soft or long lever pull in a hydraulic system usually means air in the line or a fluid leak. Inspect the hose and caliper for weeping, then have the system bled. Do not keep riding a heavy bike on brakes that feel spongy.
The chain drops off the chainring on rough ground.+
Check that the chain guide is correctly positioned and that the chain is not stretched past its wear limit. A worn chain sits badly on the ring and will drop under vibration; replace the chain and inspect the cassette at the same time.
The bike pulls to one side under braking.+
Usually a contaminated pad or a caliper that is not centred on the rotor. Loosen the caliper mounting bolts, squeeze the lever to self-centre it, then retighten. If one pad is glazed or oily, replace the pair and clean the rotor with brake cleaner.
The display shows an error code and the bike will not move.+
Switch 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 - the codes map to specific faults in the controller, motor, throttle, or battery circuits.
Certifications & Standards
The HKM-890067 is produced in a facility operating under an ISO 9001 quality management system. The lithium cells and the assembled pack carry the test documentation normally required for lithium-ion transport and sale, and the pack enclosure is rated IP65.
- 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.
- IP65 - Battery enclosure rated against dust ingress and low-pressure water jets.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is a 1500 W electric bike that reaches 31 mph in Sport mode and weighs around 70 lb before you add a rider. Read the manual before the first ride, start in a low assist level, and get used to the throttle response and the braking distance in an open area before riding in traffic or on a loose surface.
- Wear a helmet on every ride. At 31 mph, many riders choose a helmet with more coverage than a standard bicycle lid.
- Do not exceed the 330 lb (150 kg) load capacity, which includes the rider and all cargo.
- Check local law before riding on public roads or paths. A 1500 W motor with a 31 mph top speed may fall outside the standard e-bike classes in your area.
- Bed the brake pads in with 10-15 progressive stops from moderate speed during the first rides before riding at full speed.
- Do not ride through water deep enough to reach the hub motor or the battery, and do not pressure-wash the bike.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface, and do not leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack. Damaged lithium cells can vent and ignite.
- Reduce speed on wet surfaces, loose gravel, and descents. Fat tires add float and grip but they do not remove the risk of losing traction.
HKM-890067 · 1500 W brushless rear hub motor · 48 V 18 Ah lithium (864 Wh), removable and IP65 rated · 19-31 mph (30-50 km/h) top speed · 25-37 mi (40-60 km) range · 20 x 4.0 in fat tires · hydraulic disc brakes with 180 mm rotors · 7-speed drivetrain · reinforced high-tensile steel frame · 330 lb (150 kg) load capacity · 8-10 hour charge. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures assume moderate pedal assist. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads or paths.
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