20 in Dual-Battery Fat Tire E-Bike
HKM-4393171 Fat Tire Electric Bike
The HKM-4393171 carries two removable 48 V 31.2 Ah packs for about 1,498 Wh of total storage and a 750 W peak motor that pulls a 20 x 4.0 in Kenda fat tire through city streets and light trail. Front suspension, hydraulic brakes, and a Shimano 7-speed drivetrain keep the ride controlled, with a top speed of 15.5 mph and up to 50 mi of range per charge.
750W Peak MotorDual 48V 31.2Ah / ~1498 WhUp to 50 mi Range20 x 4.0 in Kenda TiresHydraulic BrakesShimano 7-SpeedFront SuspensionNFC Unlock
Motor
750 W Peak
Brushless DC, 250-750 W range
Battery
48 V 31.2 Ah
About 1,498 Wh, dual pack
Top Speed
15.5 mph
25 km/h, assist dependent
Range
Up to 50 mi
80 km per charge
Tires
20 x 4.0 in
Kenda puncture-resistant fat tires
Frame
Aluminum
Light, corrosion resistant
Overview
Range anxiety ends with two batteries. The HKM-4393171 holds a pair of removable 48 V 31.2 Ah packs - about 1,498 Wh in total - and an intelligent voltage balancer manages energy between them in dual mode, so you get extended ride time and longer pack life. Swap to single-battery mode for a lighter bike on short trips, or run both for a long day out.
A 750 W peak brushless motor drives the 20 x 4.0 in Kenda fat tires, which spread weight across a wide contact patch for stability on pavement, packed dirt, and gravel. Front suspension takes the edge off square hits while the high-volume tires absorb the smaller chatter, and hydraulic disc brakes hold their bite in the wet.
The Shimano 7-speed drivetrain lets you keep the motor in its efficient band, and NFC unlock plus a smart LCD put speed, range, and assist level at your fingertips. Top speed is 15.5 mph (25 km/h), which keeps the bike inside typical shared-path limits while still feeling lively in town.
Key Features
750 W Peak Brushless Motor
A brushless DC motor with peak output around 750 W gives strong acceleration from a standstill and steady climbing on city grades. Sealed construction resists dust and moisture, and brushless commutation means nothing inside wears the way carbon brushes do.
Dual 48 V 31.2 Ah Packs (About 1,498 Wh)
Two removable lithium packs total about 1,498 Wh. An intelligent voltage balancer optimizes energy flow between them in dual mode, extending ride time and protecting pack lifespan. Both packs slide out for indoor charging.
Front Suspension Fork
A suspension fork handles the sharp square-edged hits at the front wheel while the fat tires damp everything smaller. The combination delivers most of the comfort of a full-suspension frame without the extra weight and pivots to service.
Hydraulic Disc Brakes
Hydraulic disc brakes keep the friction surface clear of tire spray, so stopping stays consistent in rain, mud, and dust. The rotor sheds heat on long descents, and the calipers are easy to adjust as pads wear.
Shimano 7-Speed Drivetrain
A 7-speed Shimano drivetrain gives crisp, repeatable shifts across a range wide enough for technical low-speed climbing and fast paved sections. Keeping the right cadence also keeps the motor in its efficient band.
20 x 4.0 in Kenda Fat Tires
Oversized Kenda casings resist sharp objects and float over sand, snow, and loose gravel instead of digging in. The generous air volume works as natural suspension, absorbing chatter with none of the weight of a mechanical linkage.
LED Lighting Front and Rear
LED lights draw from the main batteries, so there are no separate cells to keep charged before an early start or a ride home in the dark. The rear light keeps you visible to traffic.
Aluminum Frame with NFC Unlock
An aluminum alloy frame resists corrosion and stays light enough to maneuver. NFC unlock lets you power on without fumbling for a key, and the geometry is balanced for stable riding at speed.
Full Specifications
Model
HKM-4393171 | Fat Tire Electric Bike
Frame Material
Aluminum alloy, corrosion resistant
Motor
250-750 W brushless DC (about 750 W peak)
System Voltage
48 V DC
Battery
Dual 48 V 31.2 Ah total (about 1,498 Wh) with BMS
Charging
Overnight recharge with the supplied smart charger
Battery Protection
Intelligent BMS with voltage balancer between both packs
Top Speed
15.5 mph (25 km/h), assist dependent
Range Per Charge
Up to 50 mi (80 km)
Climbing
Assisted climbs on city grades and ramps
Motor Efficiency
Brushless commutation runs cooler, needs no internal servicing
Drivetrain
Shimano 7-speed
Brakes
Hydraulic disc brakes
Suspension
Front suspension fork
Tires
20 x 4.0 in Kenda puncture-resistant fat tires
Wheels
20 in rims with reinforced spokes
Saddle
Padded saddle with upright riding position
Display
Smart LCD: speed, battery, assist level
Assist System
Multi-level pedal assist; NFC unlock
Lighting
LED front and rear lights
Load Capacity
Built for an adult rider plus daily cargo
Removable Batteries
Dual packs, tool-free removal for charging
Warranty
24 Months Warranty Service (parts and labor)
Battery, Range, and Charging
The two 48 V 31.2 Ah packs store about 1,498 Wh in total and are managed by an intelligent battery management system with a voltage balancer that optimizes energy flow between the packs in dual mode. Both packs are removable, so you can charge them indoors while the bike stays locked outside.
Quoted range is up to 50 mi (80 km). Reaching the upper end means flat pavement, moderate assist levels, correct tire pressure, and a rider of average weight; gradient, headwind, and higher assist settings all move you toward the lower figure. Cooler temperatures temporarily reduce available capacity, which returns as the pack warms.
Tip: Store the packs at 40-80 percent charge in a cool, dry place when the bike will not be ridden for a while, and avoid routinely running them below 10 percent. Both habits measurably extend the usable life of lithium-ion cells.
The supplied smart charger replenishes the packs in a standard overnight window. The BMS terminates charging automatically once the cells reach full voltage, so the packs can be left connected overnight without risk.
Daily Use & Care
- Check tire pressure before each ride and keep it within the range printed on the tire sidewall; correctly inflated fat tires are the biggest factor in range and handling.
- Keep the chain clean and lightly lubricated. Grit ground into a dry chain wears the drivetrain far faster than the mileage alone suggests.
- Inspect the hydraulic brake pads monthly and take up lever slack at the barrel adjuster as they wear down.
- Check that all bolts are torqued to specification after the first week of riding, especially on the folding and suspension parts.
- Rinse mud and grit off the frame, rotors, and drivetrain after wet rides, then dry the rotors with a few light brake applications.
- Store the batteries at 40-80 percent charge in a cool, dry place whenever the bike will sit unused for more than a few days.
- Book an annual professional tune-up to check wheel true, suspension play, and drivetrain wear.
What's in the Box
- 1 x HKM-4393171 fat tire electric bike, largely pre-assembled
- 2 x Removable 48 V 31.2 Ah lithium battery packs
- 1 x Smart charger (charges either pack)
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of pedals with reflectors
- 1 x User manual and assembly guide
Frequently Asked Questions
How does the dual battery system work?+
The bike carries two removable 48 V 31.2 Ah packs (about 1,498 Wh total). An intelligent voltage balancer manages energy between them in dual mode for longer range and better pack life. You can run a single pack for shorter trips or both for a long day out.
How far does it go on a charge?+
Up to 50 mi (80 km). Rider weight, gradient, assist level, tire pressure, temperature, and wind all affect the number. On flat pavement at moderate assist you should reach the upper end of the band.
How long does charging take?+
The supplied smart charger replenishes the packs in a standard overnight window. The BMS stops charging automatically once the cells reach full voltage, so it is safe to leave a pack plugged in overnight.
What terrain will the fat tires handle?+
Paved roads, hardpack dirt, loose gravel, sandy paths, and muddy trails. The wide contact patch floats on soft surfaces where a narrow tire would sink. For rocky sections, lower the pressure so the casing can conform.
Is this a sensible first electric bike?+
Yes. The pedal-assist system augments your effort progressively rather than delivering an abrupt surge, the fat-tire platform is stable and forgiving, and the Shimano 7-speed works like a conventional bicycle.
Can I ride it with the motor off?+
Yes. Set the assist to zero or switch the system off and the bike works as a conventional 7-speed bicycle. It weighs more than a non-electric bike, so a steep climb takes real effort, but the gearing helps considerably.
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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.
750W PeakDual 48V 31.2Ah~1498 Wh20x4.0 KendaHydraulic BrakesShimano 7-SpeedFront SuspensionNFC Unlock
Why Choose the HKM-4393171
Twice the Battery, Twice the Freedom
Two removable packs mean you can charge one indoors while riding on the other, or run both for a long day out. Range stops being something you plan the ride around.
Float Where Narrow Tires Sink
On sand, fresh snow, and loose gravel the advantage of a 20 x 4.0 in fat tire is that the wheel stays on top of the surface. That is what opens up beaches, forest tracks, and winter paths to ordinary riding.
Assist That Follows Your Effort
The pedal-assist system scales the motor contribution to what you are already doing rather than delivering a sudden surge. It feels like strong legs, not like being pushed, which suits newer e-bike riders.
Nothing Inside the Motor to Wear Out
Brushless commutation removes the carbon brushes that wear, heat, and eventually need replacing. The motor runs quietly, stays cooler under load, and needs no internal servicing across the life of the bike.
Aluminum That Stays Presentable
An aluminum alloy frame resists corrosion naturally, so winter salt and wet trails do not leave their mark. It also keeps the bike light enough to maneuver in tight spaces.
A Saddle Made for Real Distance
A padded saddle with an upright riding position reduces lower-back and shoulder strain on longer rides, and balanced geometry keeps the bike stable at speed without making low-speed manoeuvring heavy.
Controls & Indicators
Power Button
On the battery pack; hold to switch the system on and off
Assist Buttons
Up and down buttons cycle through the pedal-assist levels
Trip Meter
Trip distance and cumulative odometer on the display
Speedometer
Live speed readout in mph, switchable to km/h
Battery Gauge
Remaining capacity indicator driven by the battery management system
Light Switch
Toggle the LED lights from the control pod
Shifter
Indexed shifter for the Shimano 7-speed drivetrain
Pre-Ride Safety Checklist
- Set tire pressure for the ride ahead, within the range marked on the tire sidewall.
- Squeeze both brake levers and confirm the pads bite firmly well before the lever reaches the grip.
- Check the batteries are seated, locked, and showing the capacity you expect on the display.
- Spin both wheels to confirm the rims run true and nothing rubs the pads or the frame.
- Check the stem bolts, seat clamp, and suspension adjuster are tight, and rock the bike with the front brake on to feel for play.
- Shift through all 7 gears at low speed to confirm the drivetrain indexes cleanly in both directions.
- Select a low assist level for the first minute of riding until you have the feel of the power delivery.
- Wear a helmet, and add gloves and eye protection for longer trips.
Quick Troubleshooting
The motor will not engage.+
Confirm the display is on and showing capacity, the battery is locked in place, and both brake levers are fully released - the cut-off sensors disable the motor while a lever is pulled. Note any diagnostic code shown on the display before contacting support.
Range has dropped compared with when the bike was new.+
Check tire pressure first - a soft fat tire on tarmac is the single most common cause. Then consider temperature; cool conditions temporarily reduce capacity. If range is down sharply year-round after many cycles, a pack may be nearing the end of its life.
The brakes squeal or feel weak.+
Take up lever slack at the barrel adjuster as the pads wear. Squealing usually indicates contaminated or glazed pads - clean the rotor with brake cleaner and replace the pads in pairs if the noise continues.
The chain skips under hard pedalling.+
Either the drivetrain indexing has drifted or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time. If it skips only in the smallest cogs, replace the cassette together with the chain.
The bike feels vague or wanders at speed.+
Front tire pressure that is too low is the usual cause on a fat bike. Check pressure, then check for headset play by rocking the bike with the front brake applied, and confirm the stem bolts are torqued correctly.
The display shows a diagnostic code and the system will not run.+
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 - codes map to specific faults in the controller, motor, sensor, or battery circuits.
Certifications & Standards
The HKM-4393171 is produced in a facility operating under an ISO 9001 quality management system. The lithium cells and the assembled packs carry the test documentation normally required for lithium-ion transport and sale.
- ISO 9001 - Quality management system certification of the manufacturing facility.
- 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 packs on request.
Important Safety Notes
This bike reaches up to 15.5 mph and weighs more than a conventional bicycle once a rider is added, so braking distances are longer. Read the manual before the first ride, begin on a low assist level, and get a feel for the acceleration and stopping distance in an open area first.
- Wear a helmet on every ride, and add gloves and eye protection for longer trips.
- Do not exceed the load capacity, which includes the rider and all cargo.
- Check local law before riding on public roads or paths; a 750 W peak, 15.5 mph e-bike may fall outside standard e-bike classes in your area.
- Bed the brake pads in with a series of progressive stops from moderate speed during the first rides.
- Do not submerge the bike or use a pressure washer on the motor, battery compartment, or bearings.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface.
- Do not open, puncture, or modify the battery packs. Damaged lithium cells can vent and ignite.
- Reduce speed on wet surfaces, loose gravel, and descents. Fat tires add grip but do not remove the risk of a slide.
HKM-4393171 · 750 W peak brushless DC motor · dual 48 V 31.2 Ah lithium (about 1,498 Wh) · 15.5 mph (25 km/h) top speed · up to 50 mi (80 km) range · 20 x 4.0 in Kenda fat tires · front suspension · hydraulic disc brakes · Shimano 7-speed · aluminum frame · NFC unlock · adult rider plus cargo. 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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