Dual-Motor Fat Tire Electric Cruiser
HKM-300243 Electric Fat Tire Cruiser
The HKM-300243 pairs dual 1500 W brushless hub motors with a 48 V 40 Ah lithium battery for all-wheel-drive traction and long-range cruising. The aluminum frame, dual suspension, hydraulic disc brakes, and 7-speed Shimano drivetrain make it equally capable on city streets, gravel paths, and open cruising roads.
3000 W Combined Peak48 V 40 Ah Lithium Pack31 mph Top Speed20 x 4.0 in Fat TiresHydraulic Disc Brakes7-Speed Shimano Drivetrain145 mi Max Range330 lb Load Capacity
Motor
3000 W peak
Dual 1500 W hub motors
Battery
48 V 40 Ah
1920 Wh removable lithium
Top Speed
31 mph
50 km/h, throttle only
Range
80-145 mi
129-233 km, varies with assist
Tires
20 x 4.0 in
Fat tread, all-terrain
Load Capacity
330 lb
150 kg rider plus cargo
Overview
The HKM-300243 is built around an aluminum frame shaped for a relaxed cruiser riding position. The low-slung battery box sits between the frame tubes, lowering the center of gravity and keeping the bike stable at speed.
All-wheel-drive traction comes from two 1500 W peak brushless hub motors, one in each wheel. Combined output reaches 3000 W peak, with a total torque rating of approximately 160 N.m. A 48 V 40 Ah lithium pack stores 1920 Wh of energy to feed both motors.
Range is substantial because of the large battery. Throttle-only cruising on flat pavement returns roughly 60-80 mi. Moderate pedal-assist stretches that to 100-120 mi. Conservative riding with light assist can reach 145 mi. Hills, aggressive throttle, and cold weather reduce those figures.
Dual suspension and hydraulic disc brakes keep the ride controlled. A telescoping front fork and rear coil shock absorb impacts, while hydraulic calipers at both wheels provide the stopping power needed for a 31 mph, 330 lb-capable machine.
Key Features
Dual 1500 W Brushless Hub Motors
One motor in each wheel combines for 3000 W of peak output. The all-wheel-drive layout improves traction on loose or wet surfaces and helps the bike climb grades up to approximately 45 degrees.
48 V 40 Ah High-Capacity Battery
The 1920 Wh lithium pack is one of the largest in this class. It unlocks with a key and lifts out of the frame for indoor charging. The high capacity is what enables the 145 mi maximum range figure.
All-Wheel-Drive Traction
With motors driving both the front and rear wheels, the HKM-300243 accelerates harder and slips less on gravel, grass, and wet pavement than a single-motor bike.
Cruiser Saddle and Upright Bars
A wide padded saddle and swept-back handlebars place the rider in a relaxed, upright position. The geometry is tuned for long cruising rides rather than aggressive trail use.
80-145 Mile Range Capability
The 40 Ah battery gives enough energy for long day trips and multi-stop commutes. Range depends on assist level, terrain, and load, but most riders can cover a full week of commuting between charges.
Thermal Management for the Controller
The motor controller is housed in an aluminum case with cooling fins. The design helps maintain consistent power output during extended hill climbs and high-speed cruising.
Dual Suspension: Front Fork and Rear Shock
A telescoping hydraulic front fork and a rear coil shock work together to absorb bumps and maintain traction. The setup is effective on broken pavement, gravel, and light trails.
Hydraulic Disc Brakes, Front and Rear
Hydraulic disc brakes at both wheels provide the stopping power needed for a dual-motor bike at speed. Power-off levers cut motor drive as soon as either brake is applied.
Full Specifications
Model
HKM-300243 | Electric Fat Tire Cruiser
Frame Material
Aluminum alloy, cruiser geometry
Motor
Dual 1500 W peak brushless hub motors, 3000 W combined peak
System Voltage
48 V DC
Battery
48 V 40 Ah lithium-ion (1920 Wh), removable and lockable
Charger
3 A smart charger, 100-240 V input
Charging Time
10-12 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
31 mph (50 km/h)
Range Per Charge
80-145 mi (129-233 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 45 degrees with a solo rider
Peak Torque
160 N.m combined
Drivetrain
7-Speed Shimano rear derailleur with index shifter
Brakes
Hydraulic disc brakes, front and rear, with power-off levers
Suspension
Telescoping front fork plus rear coil shock
Tires
20 x 4.0 in fat tires, all-terrain tread
Wheels
20 in alloy rims, stainless spokes
Saddle
Wide padded cruiser saddle
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with 5 pedal-assist levels and zero assist
Lighting
LED headlight and integrated tail-light, powered by main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 85 lb (39 kg) including battery
Recommended Rider Height
5 ft 4 in to 6 ft 2 in (162-188 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The HKM-300243 carries a 48 V 40 Ah lithium pack with 1920 Wh of stored energy. That is roughly three to four times the capacity of a typical commuter e-bike, which is what allows the 80-145 mi range figure even with two motors drawing power.
Real-world range depends on how you use the dual motors. Throttle-only riding at high speed on flat pavement returns roughly 60-80 mi. Moderate pedal-assist on mixed terrain stretches that to 100-120 mi. Light assist and conservative speeds can reach 145 mi. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent.
Tip: Store the pack between 30 and 70 percent charge if the bike will sit unused for more than a month, and top it up every 4-6 weeks. Charging indoors at room temperature extends usable pack life.
The pack unlocks with the supplied key and lifts out of the frame in a few seconds. You can also charge it in place through the frame-side charge port. Two keys are included.
Daily Use & Care
- Tire pressure sets the character of the ride. Run 15-20 psi on pavement for lower rolling resistance; drop to 10-12 psi for gravel and dirt so the tire can flatten and grip.
- Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks fasteners over time if left in place.
- 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. Unplug the charger once the indicator turns green rather than leaving it connected for days.
- Keep the display and charge port covers closed when the bike is parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-300243 electric fat tire cruiser, approximately 85 percent pre-assembled
- 1 x 48 V 40 Ah removable lithium battery pack
- 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 User manual and assembly guide
- 1 x Front and rear reflector set
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 45-60 minutes with the supplied tools because of the dual motor wiring. Have a bike shop check torque and brake bedding if you are not comfortable doing it yourself.
Why are there two motors instead of one?+
Dual motors provide all-wheel-drive traction and higher combined peak output. The front motor helps pull the bike up loose hills and the rear motor pushes it forward, improving grip and acceleration.
What is the actual range I should plan for?+
Plan for 80-145 mi depending on how much you pedal and how often both motors are used. Throttle-only riding at higher speeds lands closer to 60-80 mi. Moderate pedal-assist on mixed terrain regularly returns 100-120 mi. Heavier riders, headwinds, hills, and low tire pressure all reduce range.
Is a license or registration required?+
Rules vary by state and locality. A 3000 W combined peak motor and 31 mph top speed exceed the limits of the common three-class e-bike framework in many US jurisdictions, which may place this bike in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or bike paths.
How long does the battery take to charge?+
About 10-12 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.
Can I pedal it if the battery runs out?+
Yes. The 7-Speed Shimano drivetrain works independently of the motor. The bike is heavy at approximately 85 lb, so pedaling home unassisted is slow going, but it is entirely possible on flat ground.
Will the brakes handle the speed and weight?+
Hydraulic disc brakes front and rear are the appropriate specification for a 31 mph dual-motor bike of this weight. Bed the pads in during the first few rides with 10-15 progressive stops from moderate speed.
Is the battery removable for indoor charging?+
Yes. It unlocks with the supplied key and lifts out of the frame. You can also charge it in place through the frame-side charge port.
Service & Policies
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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 Battery48 V 40 Ah PackHydraulic BrakesDual Motor7-Speed Shimano
Why Choose the HKM-300243
All-Wheel-Drive Traction
Two hub motors mean power reaches both wheels. The result is better acceleration, hill climbing, and control on loose or wet surfaces than a single-motor bike can offer.
Dual Suspension for Mixed Terrain
A front fork and rear shock absorb potholes, gravel, and trail impacts. The cruiser frame stays composed when the pavement gets rough.
Throttle Plus Pedal Assist
Twist the throttle for immediate acceleration, or use the five pedal-assist levels to extend range. Most riders use a mix of both throughout a ride.
Direct-Drive Simplicity
Both motors live in the wheel hubs with no mid-drive gearbox or extra chain to service. Fewer moving parts in the drive path means less maintenance and a quiet ride.
Aluminum Frame for Strength and Weight
The aluminum alloy frame handles the torque of dual motors while keeping total weight reasonable for a bike with this much battery capacity.
Sealed Components for Daily Use
Sealed connectors, a lockable battery compartment, and hydraulic brake lines all make sense for a high-power bike that gets ridden in varied weather.
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 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, 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 integrated tail-light
Shifter
Right-hand index shifter for the 7-Speed Shimano rear derailleur
Pre-Ride Safety Checklist
- Check tire pressure and set it for the terrain you plan to ride: 15-20 psi for pavement, 10-12 psi for gravel or dirt.
- Squeeze both brake levers. They should firm up well before reaching the grip, with no sponginess that would indicate air in the hydraulic line.
- 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 quick-release levers and axle nuts are tight, and that 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 in traffic.
- Switch on the headlight and tail-light if you will be riding near dusk, and wear a helmet rated for the speeds this bike reaches.
- Check that the saddle is tight and that the pedals thread in securely before the first ride.
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 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 31 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 rattles over bumps.+
Check that the quick-release lever on the fork is fully closed and that the wheel is seated in the dropouts. If the rattle persists, the fork may need service - inspect the stanchions for scoring.
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, motors, or throttle circuits.
Certifications & Standards
The HKM-300243 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.
- 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 electric bicycle capable of 31 mph with all-wheel-drive acceleration. Read the manual fully before the first ride and practice throttle control in an open, traffic-free area until the response feels predictable. Dual-motor bikes accelerate harder than single-motor bikes; increase speed gradually.
- Wear a helmet on every ride. At 31 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 and cargo.
- Check local law before riding on public roads or paths. A 3000 W combined peak motor and 31 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.
- Do not ride through water deep enough to reach the hub motors or the battery compartment.
- 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 gravel, wet surfaces, and downhill grades; fat tires add grip but do not eliminate the risk of losing traction.
HKM-300243 · dual 1500 W brushless hub motors (3000 W combined peak) · 48 V 40 Ah lithium (1920 Wh) · 31 mph top speed · 80-145 mi range · 20 x 4.0 in fat tires · 330 lb (150 kg) load capacity · aluminum cruiser frame · hydraulic disc brakes · 7-Speed Shimano derailleur · dual suspension. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under moderate pedal-assist on level pavement. 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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