26 in 21-Speed Fat Tire Snow Bike
HKM-7125587 Electric Fat Tire Bike
The HKM-7125587 answers a simple question: how much fat tire bike can you get without the price of a motorcycle. The answer here is a 2000 W brushless rear hub motor that puts torque straight into the wheel with no extra chain or belt in the drive path, a 1104 Wh 48 V 23 Ah pack, a hydraulic suspension fork up front, 26 x 4.0 in tires with fat snow and mud tread, and dual mechanical disc brakes. Range lands between 31 and 56 mi, and the 21-Speed Shimano drivetrain is there for the days you would rather pedal than twist.
2000 W rear hub Motor48 V 23 Ah / 1104 Wh Pack31 mph Top Speed31-56 mi Range26 x 4.0 in TiresDisc BrakesSuspension Fork330 lb Load Capacity
Motor
2000 W
2600 W peak, rear hub
Battery
48 V 23 Ah
1104 Wh LG 21700 lithium-ion
Top Speed
31 mph
50 km/h, throttle only
Range
31-56 mi
50-90 km, varies with assist
Tires
26 x 4.0 in
Fat snow and mud tread tread
Load Capacity
330 lb
150 kg rider plus cargo
Overview
Fat tires change what a bike can be ridden on. The 26 x 4.0 in casing runs at low pressure and spreads the load across a contact patch several times wider than a standard tire, so sand, gravel, packed snow, and wet leaves stop being obstacles. The same air volume also works as suspension, taking the sting out of curbs and frost heaves before it reaches your wrists.
Energy comes from a 48 V 23 Ah LG 21700 lithium-ion pack holding 1104 Wh. The pack unlocks with a key and lifts out of the frame so it can be charged indoors while the bike stays where it is parked. The charger supplied is a 3 A unit that takes a fully flat pack back to full in about 7-8 hours; partial top-ups take proportionally less, and there is no need to run the pack down before plugging in.
Range is a window, not a number. Throttle-only riding at or near the 31 mph top speed sits at the low end, around 31 mi. Moderate pedal-assist on mixed terrain returns roughly 44 mi. Light assist with steady pedalling on level ground reaches the quoted 56 mi. Rider weight, tire pressure, headwind, hills, and temperature all move the result; cold below 40 F temporarily costs 10-20 percent of usable capacity and gives it back when the pack warms up.
Hardware choices favour serviceability. Dual mechanical disc brakes, 180 mm rotors handle deceleration and shed heat through vented rotors. The 21-Speed Shimano drivetrain is a standard pattern, which keeps replacement chains, cables, and cassettes cheap and available. 26 x 4.0 in tires are a common size, so a spare tube is easy to carry.
Key Features
2000 W Brushless Rear Hub Motor
The motor is laced directly into the rear wheel, so there is no secondary chain or belt between it and the road and drive losses stay low. Rated 2000 W with 2600 W available in short bursts and 100 N.m of torque, it pulls away cleanly from a standing start and holds 31 mph on flat ground. Routine maintenance amounts to keeping the axle nuts torqued.
48 V 23 Ah LG Lithium Pack (1104 Wh)
A 48 V 23 Ah LG 21700 lithium-ion pack storing 1104 Wh sits behind a lockable cover and lifts out with a key, so it can charge at a desk while the bike stays locked outside. A full charge from empty takes about 7-8 hours on the supplied 3 A charger, and the battery management system handles cell balancing, over-current, and low-temperature cut-off without any input from you.
Suspension Fork with Preload and Lockout
A hydraulic suspension fork with preload adjustment and a mechanical lockout takes the edge off broken pavement, kerb drops, and gravel. Unlock it for rough surfaces; lock it out on smooth tarmac so none of your pedalling energy disappears into fork movement. Combined with the air volume in the 26 x 4.0 in tires it covers most of what a commute or a fire road throws at you.
Dual mechanical disc brakes, Front and Rear
Cable-actuated callipers squeeze both rotors, an arrangement that can be adjusted and re-cabled with basic tools anywhere in the world. Both levers carry cut-off switches that drop motor drive the instant they move - worth having on a bike that reaches 31 mph. Bed the pads in with 10-15 progressive stops before riding at speed.
21-Speed Shimano Derailleur Drivetrain
A 21-Speed Shimano drivetrain gives usable cadence from walking pace to cruising speed. Shifting also lets you pedal usefully at any speed instead of spinning out once the motor is doing the work. The index shifter, chain, and cassette are standard bicycle parts, so a worn chain is a shop-shelf item rather than a proprietary order, and the gear range is what lets a heavier rider climb without leaning on the motor the entire way up.
26 x 4.0 in Fat Snow And Mud Tread Tires
26 x 4.0 in tires with fat snow and mud tread carry the bike. Run them at the low end of the pressure range and the casing flattens into a wide contact patch that finds grip on gravel, wet pavement, packed snow, and loose dirt; run them firm and rolling resistance drops for pavement mileage. The Kenda casing is a common size, so tubes and spare covers are easy to source.
LED Headlight and Brake-Activated Tail-Light
The headlight runs off the main pack, so there is no separate cell to keep charged, and the tail-light brightens whenever either brake lever moves. On a bike that is often ridden home after dark that combination is more useful than a brighter beam alone, because it tells the driver behind you what you are about to do.
Rear Rack Mounts and Cargo Capacity
Threaded bosses on the seat stays and dropouts accept a standard rear rack, panniers, or a child seat. Combined rider and cargo capacity is 330 lb (150 kg), which leaves real headroom for a loaded backpack, a week of groceries, or camping kit on a bike that already weighs 79 lb on its own.
Full Specifications
Model
HKM-7125587 | Electric Fat Tire Bike
Frame Material
Aluminum alloy
Motor
2000 W brushless rear hub motor, 2600 W peak
System Voltage
48 V DC
Battery
48 V 23 Ah LG 21700 lithium-ion (1104 Wh), removable and lockable
Charger
3 A smart charger, 100-240 V input
Charging Time
7-8 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
31 mph (50 km/h)
Range Per Charge
31-56 mi (50-90 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 30 degrees with a solo rider
Peak Torque
100 N.m
Drivetrain
21-Speed Shimano derailleur with index shifter
Brakes
Dual mechanical disc brakes, 180 mm rotors, with motor cut-off levers
Suspension
Hydraulic suspension fork with preload and lockout
Tires
26 x 4.0 in, fat snow and mud tread
Wheels
26 in alloy rims, stainless spokes
Saddle
Padded saddle on a quick-release post, tool-free height adjustment
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Thumb throttle with 5 pedal-assist levels and zero assist
Lighting
LED headlight and brake-activated tail-light, powered by the main pack
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 79 lb (36 kg) including battery
Recommended Rider Height
5 ft 2 in to 6 ft 3 in (157-190 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V 23 Ah pack stores 1104 Wh. Most commuter e-bikes ship with 400-600 Wh, so this is roughly double that budget - and energy on board is the single variable that decides whether a bike can do a 56 mi day without a mid-ride charge.
Four variables move real-world range more than anything else: how much you pedal, the combined rider and cargo weight, tire pressure, and terrain. Throttle-only riding near 31 mph lands around 31 mi. Moderate pedal-assist on mixed ground regularly returns 44 mi. Light assist with steady pedalling on level pavement reaches 56 mi. Below 40 F the pack temporarily gives up 10-20 percent of usable capacity and recovers it once it warms.
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 rather than in an unheated garage measurably extends usable pack life.
The pack unlocks with the supplied key and lifts out of the frame in a few seconds, so it can charge at a desk while the bike stays locked outside. Two keys are included. Charging in place works equally well - the port is reachable from the drive side without removing anything.
Daily Use & Care
- Tire pressure sets the character of the bike. Run 15-20 psi on pavement for lower rolling resistance; drop toward 10 psi on gravel, sand, or snow so the casing can flatten and grip.
- Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks aluminium fasteners if it is left in place.
- Check the axle nuts and stem bolts before the first ride of each week. 100 N.m of motor torque works fasteners loose faster than a conventional bicycle does.
- Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or dust.
- Inspect brake pad thickness monthly. Pads wear silently until they are gone; replace when the friction material is under 1 mm.
- Charge indoors at room temperature and unplug once the indicator turns green rather than leaving the charger 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-7125587 electric fat tire bike, approximately 85 percent pre-assembled
- 1 x 48 V 23 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 pedals
- 1 x LED headlight (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
How much assembly is required out of the box?+
The bike arrives roughly 85 percent assembled. What is left is 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, and have a bike shop check torque and bed the brakes in if you would rather not do it yourself.
What range should I actually plan for?+
Plan for 31-56 mi. Throttle-only riding near the 31 mph top speed sits at the low end, around 31 mi. Moderate pedal-assist on mixed terrain returns about 44 mi. Light assist and steady pedalling on level ground reaches 56 mi. Headwinds, hills, a heavy load, soft tires, and cold weather all reduce the result.
How long does the battery take to charge?+
About 7-8 hours from fully empty with the supplied 3 A charger. Partial top-ups take proportionally less time, and there is no benefit to running the pack down before recharging - lithium cells prefer shallow cycles.
Is a licence or registration required?+
Rules vary by state and by city. A 2000 W motor with 2600 W peak output and a 31 mph top speed sits at or beyond the edge of the common three-class e-bike framework in many US jurisdictions, which can place a bike like this in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or shared paths.
Can I still pedal it if the battery runs flat?+
Yes. The 21-Speed Shimano drivetrain works entirely independently of the motor. At roughly 79 lb the bike is heavy for unassisted pedalling, so getting home is slow going, but on level ground it is straightforward.
How steep a hill will it climb?+
Roughly 30 degrees with a solo rider, using the throttle and a low gear together. Peak output of 2600 W is available for short bursts, which is what gets you over the steepest part; sustained climbing is better done with light pedalling so the motor stays cool.
Will the brakes cope with the speed and the weight?+
Dual mechanical disc brakes are the appropriate specification for a 79 lb bike carrying up to 330 lb at 31 mph. Bed the pads in over the first few rides with 10-15 progressive stops from moderate speed to build the friction layer on the rotors, and brake earlier than you would on an unloaded bicycle when the bike is loaded.
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 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 Battery1104 Wh PackDisc BrakesSuspension Fork21-Speed Shimano Drivetrain330 lb Load
Why Choose the HKM-7125587
All-Surface, Not Fair-Weather
The 26 x 4.0 in casing is what makes this a genuine all-surface bike rather than a fair-weather one. With 100 N.m available, beach sand, forest gravel, and packed snow are all rideable rather than merely survivable.
Climbs Without Drama
Rated at 100 N.m with 2600 W available in peaks, the drive pulls a solo rider up a grade of roughly 30 degrees. Shift down, keep pedalling lightly, and the motor stays inside its efficient band instead of stalling and cooking itself at the bottom of the hill.
Three Ways to Ride
Twist or thumb the throttle for immediate power, dial in one of five pedal-assist levels and let the motor top up your effort, or switch assist off entirely and ride the 21-Speed Shimano drivetrain as a bicycle. Most owners use all three on the same trip.
Few Moving Parts in the Drive Path
Nothing sits between the motor and the road except the wheel bearing, so there is no extra chain, belt, or gearbox to service and the bike is notably quiet at speed.
Roughly a Cent a Mile
A full 1104 Wh charge costs a few pence of household electricity and covers 31-56 mi. Replacing even two car trips a week with this bike pays back a meaningful share of the purchase over a year, before you count parking and servicing.
Made to Live Outside
Everything exposed to road film is chosen for it - sealed electrical connectors, a lockable battery bay, and stainless cable runs with sealed ferrules that will not seize after a salty winter.
Controls & Indicators
Power Button
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
Throttle
Right-hand thumb throttle, proportional response, works independently of assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Segment charge indicator plus percentage readout on the backlit LCD
Light Switch
Long-press the up button to toggle the LED headlight and tail-light
Shifter
Right-hand index shifter for the 21-Speed Shimano rear derailleur
Pre-Ride Safety Checklist
- Set tire pressure for the surface you plan to ride today, not for the ride you did last week.
- Squeeze both brake levers. They should firm up well before touching the grip, with no sponginess.
- Confirm the battery is seated and locked and that the display shows the state of charge you expect.
- Spin both wheels and check that the rims run true and nothing rubs a pad or the frame.
- Check that the axle nuts and quick-releases 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 out near dusk, and wear a helmet rated for the 31 mph this bike reaches.
Quick Troubleshooting
The motor does not engage when I use the throttle.+
Confirm the display is on and showing charge, that the battery is locked into place, and that both brake levers are fully released - the cut-off sensors disable motor drive while a lever is pulled. If the display shows an error code, note it before contacting support.
Range has dropped noticeably compared with when it was new.+
Check tire pressure first; a soft tire on pavement is the most common cause by a wide margin. Then consider temperature, which temporarily reduces available capacity in the cold. If range is down more than 30 percent year-round after several hundred cycles, the pack is approaching the end of its service life.
The brakes feel spongy at the lever.+
Cable systems go spongy as the outer housing compresses and the pads wear. Take up the slack at the barrel adjuster, and if that runs out of travel, re-set the cable at the calliper pinch bolt and check pad thickness.
The chain skips under hard pedalling.+
The derailleur indexing is out of adjustment, or the chain and cassette are worn. Turn the barrel adjuster a quarter turn at a time to bring the indexing back. If it skips only in the smallest sprockets, the cassette is worn and should be replaced together with the chain.
There is a knock or rattle from the front end over bumps.+
Check that the fork quick-release or axle is fully tight and the wheel is seated in the dropouts. If the noise persists, inspect the stanchions for scoring and have the lowers serviced - a fork that has lost its damping will also feel harsh rather than plush.
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 what you were doing when it appeared, then contact support - codes map to specific faults in the controller, motor, throttle, or battery circuits.
Certifications & Standards
The HKM-7125587 is produced in a facility operating under an ISO 9001 quality management system. The LG 21700 lithium-ion 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. Read the manual fully before the first ride and practise throttle control in an open, traffic-free area until the response feels predictable. Braking distances at 31 mph are considerably longer than they are on a conventional bicycle, and longer again with a load.
- 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 all cargo.
- Check local law before riding on public roads or shared paths. A 2000 W motor with 2600 W peak output and a 31 mph top speed may fall outside standard e-bike classifications where you live.
- Bed the brake pads in 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 motor or the battery compartment.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface, and do not leave a charging battery unattended overnight.
- Do not open, puncture, or modify the battery pack. A damaged lithium pack can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades. Wide tires add grip but do not remove the risk of losing traction.
HKM-7125587 · 2000 W rear hub motor (2600 W peak) · 48 V 23 Ah LG 21700 lithium-ion (1104 Wh) · 31 mph top speed · 31-56 mi range · 26 x 4.0 in tires · 330 lb (150 kg) load capacity · aluminum alloy frame · suspension fork · dual mechanical disc brakes, 180 mm rotors · 21-speed shimano drivetrain. 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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