Fat-Tire Electric Mountain Bike
HKM-0991443 Electric Fat Tire Mountain Bike
The HKM-0991443 pairs a 1000 W brushless rear hub motor with a 48 V 12.8 Ah lithium pack in a hydroformed 6061 aluminum frame built for trail capability. The oversized 26 x 4.0 in fat tires chew through loose gravel, sand, packed dirt, and even light snow with grip that narrower tires cannot match. A coil-sprung front fork with 80 mm of travel absorbs roots and rocks, dual-piston hydraulic disc brakes provide fade-resistant stopping power, a 7-speed drivetrain handles the climbs, and a color LCD display keeps ride data in view. A rear rack adds utility for daily errands or trail-day gear.
1000 W Brushless Hub Motor48 V 12.8 Ah / 614 Wh Pack28 mph Top Speed26 x 4.0 in Fat TiresHydraulic Disc Brakes80 mm Front Suspension7-Speed DrivetrainRear Rack Included
Motor
1000 W
Brushless rear hub
Battery
48 V 12.8 Ah
614 Wh removable lithium
Top Speed
28 mph
45 km/h, throttle only
Range
37+ mi
60+ km, varies with assist
Tires
26 x 4.0 in
Fat all-terrain tread
Load Capacity
300 lb
136 kg rider plus cargo
Overview
The HKM-0991443 is built around a hydroformed 6061 aluminum alloy frame that balances low weight with high stiffness. Gusseted junctions at the head tube and bottom bracket add durability under the torque of a 1000 W motor without unnecessary bulk. Internal cable routing keeps the look clean and protects shift and brake lines from trail debris.
A 1000 W brushless rear hub motor delivers instant acceleration from a standstill and confident climbing on grades up to approximately 15 degrees. The sealed motor housing resists dust and water ingress for consistent output mile after trail mile. Peak efficiency over 85 percent means more of the battery energy reaches the road rather than being wasted as heat.
The 48 V 12.8 Ah lithium pack stores roughly 614 Wh of energy — enough for 37+ miles (60+ km) per charge under typical mixed assist conditions on level ground. The intelligent BMS monitors cell balance, temperature, and short-circuit protection throughout the charge cycle, extending pack life well beyond 800 cycles while retaining 80 percent capacity. The pack is removable for indoor charging or can be charged in place through the frame-side port.
The 26 x 4.0 in fat tire platform is the defining feature for all-surface capability. Run at low pressure (5-30 PSI depending on terrain), the wide casing floats over sand and snow while providing a large contact patch for grip on loose gravel, wet pavement, and rocky paths. The aggressive tread pattern sheds mud instantly and maintains bite in corners. Combined with an 80 mm travel front fork, this setup handles forest trails, fire roads, park paths, and light snow with equal confidence.
Key Features
1000 W Brushless Rear Hub Motor
A sealed brushless hub motor delivers 1000 W of power with peak efficiency over 85 percent. Instant torque from zero RPM provides confident acceleration from stops and strong climbing on loose surfaces up to 15-degree grades. The dust-and-water-resistant design ensures consistent output across seasons.
48 V 12.8 Ah Lithium Pack (614 Wh)
A compact but capable lithium pack storing 614 Wh of energy. The intelligent BMS actively monitors cell balance, temperature, and short-circuit protection. Removable for indoor charging; a full recharge takes about 4-6 hours with the supplied charger.
80 mm Travel Front Suspension Fork
A coil-sprung front fork with anodized stanchions provides 80 mm of suspension travel. The progressive spring rate handles both small trail chatter and bigger impacts from roots and rocks, reducing rider fatigue and keeping the front wheel planted on uneven terrain.
Hydraulic Disc Brakes With 180 mm Rotors
Dual-piston hydraulic calipers act on 180 mm stainless steel rotors front and rear. Consistent lever feel in wet, muddy, or dusty conditions gives you absolute control when scrubbing speed before a corner or holding a line down a descent.
7-Speed Drivetrain With Wide-Ratio Cassette
An 11-28T cassette paired with a precision index shifter gives usable pedaling cadence from walking pace up to cruising speed. Crisp, reliable engagement even under load lets you contribute human power on climbs and extend range.
26 x 4.0 in All-Terrain Fat Tires
Massive 4.0-inch wide tires on 26-inch rims float over sand, snow, and rocky paths. Low-pressure capability (5-30 PSI) maximizes grip and cushions the ride. Aggressive tread sheds mud instantly while maintaining cornering bite.
Round LED Headlight and Rear Light
A classic round LED headlight mounted on the handlebar illuminates the path ahead. An integrated tail-light activates when braking, adding visibility from behind. Both run off the main battery with no separate batteries required.
Rear Rack for Cargo
A sturdy pre-installed rear rack supports panniers, a backpack, or trail-day gear. Combined with the 300 lb load rating, the bike transitions easily between daily commuting and weekend trail rides.
Full Specifications
Model
HKM-0991443 | Electric Fat Tire Mountain Bike
Frame Material
6061 aluminum alloy, hydroformed tubing, internal cable routing
Motor
1000 W brushless rear hub motor, peak efficiency over 85%
System Voltage
48 V DC
Battery
48 V 12.8 Ah lithium-ion (614 Wh), removable, BMS protected
Charger
2 A smart charger, 100-240 V input
Charging Time
4-6 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
28 mph (45 km/h)
Range per Charge
37+ mi (60+ km), varies with terrain, assist level, and rider weight
Climbing Grade
Up to approximately 15 degrees with pedal assist
Peak Torque
Approximately 55 N.m
Drivetrain
7-speed derailleur, 11-28T cassette, index shifter
Brakes
Hydraulic disc, 180 mm rotors, dual-piston calipers
Suspension
Coil-sprung front fork, 80 mm travel, preload adjustable
Tires
26 x 4.0 in fat tires, 5-30 PSI recommended
Wheels
26 in alloy rims, stainless spokes
Saddle
Ergonomic saddle with adjustable height and angle
Display
Backlit color LCD: speed, battery, trip distance, odometer, assist mode
Throttle
Twist-grip throttle with 5 pedal-assist levels
Lighting
LED headlight, integrated tail-light, powered by main battery
Load Capacity
300 lb (136 kg) rider plus cargo
Bike Weight
Approximately 68 lb (31 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 12.8 Ah pack stores roughly 614 Wh of energy. While this is a moderate capacity by e-bike standards, the efficient 1000 W motor (over 85 percent peak efficiency) extracts maximum range from every watt-hour. Under typical mixed-assist riding on level ground, expect 37+ miles (60+ km) per charge.
Real-world range depends on how much you pedal, rider weight, tire pressure, and terrain. Throttle-only use at higher speeds reduces range compared with pedal-assist. Aggressive riding on steep trails or soft surfaces draws more current. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent; it recovers once the pack warms up.
Tip: Store the pack between 30 and 70 percent charge if unused for more than a month, and top it up every 4-6 weeks. Charging indoors at room temperature extends usable pack life considerably compared with outdoor or garage charging.
The 48 V pack unlocks and removes from the frame for convenient indoor charging or security storage. Two keys are included for the lock mechanism. Charging with the pack installed works equally well through the accessible frame-side port.
Daily Use & Care
- Set tire pressure for your terrain: 20-25 PSI for pavement and hardpack, 15-20 PSI for gravel and dirt, 5-15 PSI for snow or soft sand.
- Rinse the frame and drivetrain with fresh water after riding in mud or salted roads. Dry before storing to prevent corrosion on aluminum components.
- Check axle nuts, motor mount bolts, and stem fasteners before the first ride each week. Hub-motor torque works hardware loose faster than conventional bikes.
- Lubricate the chain every 100-150 mi or after any ride through water, mud, or dusty conditions.
- Inspect hydraulic brake pad thickness monthly. Replace pads when friction material is under 1 mm.
- Charge indoors at room temperature. Unplug once the indicator shows full rather than leaving connected overnight.
- Check front fork stanchions for oil leaks or scoring during routine cleaning. Service if travel feels reduced or the fork makes unusual noises.
What's in the Box
- 1 x HKM-0991443 electric fat tire mountain bike, approximately 85 percent pre-assembled
- 1 x 48 V 12.8 Ah removable lithium battery pack
- 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 folding pedals
- 1 x Rear rack (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
How long does a full charge take?+
Using the supplied 48 V charger, a fully depleted battery reaches 100 percent in approximately 4-6 hours. The intelligent BMS automatically stops charging once full to protect cell health. Partial top-ups take proportionally less time.
What kind of terrain can it handle?+
The 4-inch fat tires and 80 mm front suspension let you ride confidently on forest trails, packed dirt, loose gravel, sand, and even light snow. The 7-speed gearbox helps maintain cadence on steep grades up to about 15 degrees.
How much assembly is required?+
Minimal assembly is needed. The bike ships 85 percent pre-assembled; install the front wheel, handlebars, and pedals using the included tools. Budget 30-45 minutes.
Is the battery removable?+
Yes. The 48 V pack unlocks and removes for convenient off-bike charging or secure indoor storage. A lock mechanism keeps it firmly in place while riding.
What real-world range should I expect?+
Plan for 37+ miles (60+ km) under typical mixed assist mode on level ground. Actual range varies with rider weight, terrain, assist level, tire pressure, and throttle use. Aggressive riding or soft-surface conditions reduce range.
Can I pedal if the battery runs out?+
Yes. The 7-speed drivetrain works independently of the motor. At approximately 68 lb the bike is heavy but can be pedaled unassisted on flat ground in an emergency.
Will the brakes handle the weight and terrain?+
Dual-piston hydraulic calipers with 180 mm rotors are appropriate for a 28 mph bike of this weight. Bed the pads in with progressive stops during the first few rides before riding at speed on trails.
Is a license or registration required?+
Rules vary by state and locality. A 1000 W motor with 28 mph top speed may exceed standard e-bike class limits in some jurisdictions. Check your local DMV and ordinances before riding on public roads.
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 Battery614 Wh PackHydraulic BrakesFront SuspensionFat Tires
Why Choose the HKM-0991443
Fat Tires Unlock Every Surface
The 26 x 4.0 in platform handles pavement, gravel, sand, snow, and packed dirt from one bike. Low pressure capability turns the tires into suspension that grips where narrow tires would skate.
Front Suspension for Trail Comfort
80 mm of coil-sprung travel absorbs roots, rocks, and trail chatter that would otherwise transmit directly through a rigid fork. The progressive spring rate handles small bumps and big hits alike.
Throttle or Pedals — Your Choice
Twist the throttle for immediate acceleration from stops, or shift through 7 gears and pedal with motor assist. Most riders mix both — throttle for launches, pedals for range extension, motor for hills.
Sealed Brushless Motor
The dust-and-water-resistant brushless hub motor runs quietly and efficiently (85%+ peak). No brushes to replace, no exposed commutator to contamination — just consistent power output season after season.
Hydroformed Aluminum Frame
6061 aluminum with hydroformed tubes and gusseted junctions delivers strength where the 1000 W motor applies torque while keeping weight manageable for trail maneuvering and loading onto a rack.
Trail-to-Street Versatility
IP65-rated electrical components, a lockable battery compartment, hydraulic brakes that resist mud and water, and a rear rack make this bike equally suited for weekday commutes and weekend trail adventures.
Controls & Indicators
Power Button
Located on the battery pack or display; 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 on the backlit color LCD
Battery Gauge
Percentage readout and segmented indicator on the color LCD display
Light Switch
Button to toggle the LED headlight and integrated tail-light
Shifter
Right-hand index shifter for the 7-speed rear derailleur
Pre-Ride Safety Checklist
- Check tire pressure for your planned terrain: 20-25 PSI for pavement, 15-20 PSI for trails, 5-15 PSI for soft surfaces like sand or snow.
- Squeeze both brake levers. They should firm up well before reaching the grip with no sponginess indicating air in the hydraulic line.
- Confirm the battery is seated, locked, and shows expected state of charge on the display.
- Spin both wheels and check that rims run true and nothing rubs brake pads or frame.
- Verify quick-release levers and axle nuts are tight, and the headset has no play when rocking the bike with the front brake applied.
- Test the throttle at walking pace in a clear area before riding on trails or in traffic.
- Switch on the headlight and tail-light if riding near dusk, and wear a helmet rated for the speeds this bike reaches.
Quick Troubleshooting
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 — brake cut-off sensors disable the motor while a lever is pulled. If an error code appears, note it and contact support.
Range dropped noticeably compared with when it was new.+
Check tire pressure first — the most common cause on fat-tire bikes. Then consider temperature effects. If range is down more than 30 percent year-round after many cycles, the pack may be approaching end of life.
The brakes feel spongy at the lever.+
Air in the hydraulic line or fluid degradation. Stop riding and have the system bled and inspected. Do not continue riding a 28 mph bike on compromised brakes.
The chain skips under hard pedaling.+
Derailleur indexing may be out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time. If skipping persists only in small cogs, replace cassette and chain together.
The front fork feels stiff or bottoms out easily.+
Check preload adjustment if available. If the fork has lost travel, makes noise, or shows oil on the stanchions, it needs service — inspect seals and consider having it rebuilt.
The display shows an error code and the bike will not move.+
Power off, wait 30 seconds, and switch back on. If the code returns, note the exact code and conditions, then contact support — codes map to specific faults in controller, motor, or throttle circuits.
Certifications & Standards
The HKM-0991443 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and assembled pack carry 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, 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 an electric bicycle capable of 28 mph with a 1000 W motor. Read the manual fully before the first ride and practice throttle control in an open, traffic-free area until the response feels predictable.
- Wear a helmet on every ride. At 28 mph a certified bicycle helmet is appropriate; consider additional protection for trail riding.
- Do not exceed the 300 lb (136 kg) load capacity, which includes the rider and any cargo.
- Check local law before riding on public roads or paths. A 1000 W motor with 28 mph top speed may place this vehicle outside standard e-bedike classifications in your area.
- Bed in the brake pads with 10-15 progressive stops during the first few rides before riding at full speed on trails.
- Do not ride through water deep enough to reach the hub motor or battery compartment.
- Charge only with the supplied charger, indoors, at room temperature, and on a non-flammable surface.
- Do not attempt to open, puncture, or modify the battery pack. Damaged lithium packs can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades; fat tires add grip but do not eliminate traction risk.
HKM-0991443 · 1000 W brushless rear hub motor · 48 V 12.8 Ah lithium (614 Wh) · 28 mph top speed · 37+ mi range · 26 x 4.0 in fat tires · 300 lb (136 kg) load capacity · 6061 aluminum frame · 80 mm front suspension · hydraulic disc brakes · 7-speed 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 - confirm local regulations before riding on public roads.
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