20 in 1500 W Dual-Suspension Fat Tire Electric Mountain Bike
HKM-0794835 Full-Suspension Electric Mountain Bike
The HKM-0794835 is a full-suspension electric mountain bike built around a 1500 W brushless rear hub drawing on a 48 V 20 Ah pack (960 Wh of 21700 lithium, removable). Small 20 in wheels react quickly and hit hard, which is exactly why this build puts travel at both ends rather than relying on tyre volume alone to smooth the ride. Braking is handled by hydraulic disc brakes, front and rear from Zoom, the drivetrain is a 7-Speed Shimano unit, and the rolling stock is 20 x 4.0 in Chaoyang rubber on 20 in reinforced alloy rims. Suspension is full suspension: hydraulic fork plus rear coil shock, and the frame is aluminum alloy dual-suspension frame rated for 400 lb (181 kg) of rider and cargo.
1500 W (2000 W Peak)48 V 20 Ah / 960 Wh Pack34 mph Top Speed31-50 mi Per Charge20 x 4.0 in Chaoyang TiresHydraulic Disc Brakes7-Speed Shimano Drivetrain400 lb Load Capacity
Motor
1500 W
2000 W peak, brushless rear hub
Battery
48 V 20 Ah
960 Wh 21700 lithium, removable
Top Speed
34 mph
55 km/h, condition dependent
Range
31-50 mi
50-80 km, varies with assist
Tires
20 x 4.0 in
Chaoyang casing
Load Capacity
400 lb
181 kg rider plus cargo
Overview
The HKM-0794835 is full-suspension electric mountain bike. 1500 W with genuine dual suspension on a compact 20 in wheelbase. Fat tyres do two jobs at once. Run soft, the wide casing flattens against gravel or sand and finds grip a narrow tyre cannot. Run firmer on tarmac, the same casing still soaks up expansion joints and drain covers, so the bike stays comfortable without any suspension having to move.
Power comes from a 1500 W brushless rear hub with a 2000 W short-duration peak, fed by a 48 V 20 Ah pack holding 960 Wh of 21700 lithium, removable. Peak torque at the wheel is quoted at 95 N.m, and the drive is rated to pull a gradient of roughly 33 degrees with a solo rider aboard. The 7-Speed Shimano drivetrain lets you add your own effort across the whole speed range rather than sitting on the throttle.
Quoted range is 31-50 mi (50-80 km), and the spread is wide because the bike adapts to how it is ridden. Throttle-only riding at the top of the speed range lands near the bottom of that band; moderate pedal assist on rolling terrain lands in the middle; light assist on flat ground with correct tyre pressure reaches the upper figure. Cold below 40 F (4 C), soft tyres, headwinds and a heavy load all pull the number down, and all of it comes back when conditions improve.
Contact with the ground is through 20 x 4.0 in Chaoyang tyres on 20 in reinforced alloy rims, and suspension is full suspension: hydraulic fork plus rear coil shock. Stopping is by hydraulic disc brakes, front and rear supplied by Zoom. Kerb weight is about 84 lb (38 kg) with the pack fitted, and the frame carries a combined rider-and-cargo rating of 400 lb (181 kg). It suits rough tracks, kerb-heavy urban riding and jump lines where the rear wheel needs somewhere to go.
Key Features
1500 W Brushless Hub Motor
A brushless rear hub delivers a quoted 95 N.m of torque at the wheel, with a 2000 W short-duration peak available for standing starts and short ramps. There is no external gearbox in the drive path, so losses stay low and routine maintenance amounts to keeping the axle hardware torqued and the connectors clean. The drive is rated to hold a gradient of about 33 degrees with a solo rider.
48 V 20 Ah Pack, 960 Wh of Storage
The pack uses 21700 lithium, removable and sits in a lockable cradle so it can be lifted out with a key and charged indoors, or charged in place through the frame-side port. A full charge from empty takes about 6-7 hours. A smart battery management system watches cell balance, temperature and current draw, and cuts the pack out before any of the three reaches a damaging level.
Suspension: Full suspension: hydraulic fork plus rear coil shock
Full suspension: hydraulic fork plus rear coil shock is fitted. The point of the setup is to keep the tyre loaded and in contact with the ground; a wheel that is skipping is a wheel that is neither driving nor steering. Set the preload for your weight before the first proper ride and re-check it after the first month of use.
Hydraulic disc brakes, front and rear
Hydraulic disc brakes, front and rear from Zoom are fitted at both ends. Both levers carry motor cut-off switches, so the drive is disabled the instant either one is pulled. Sealed hydraulic lines keep lever effort light and consistent as the rotors heat up on a long descent, and there is no cable to stretch or corrode. Bed the pads in during the first few rides with ten to fifteen progressive stops from moderate speed to build an even transfer layer on the rotors.
7-Speed Shimano Drivetrain
The 7-Speed Shimano drivetrain gives a usable pedalling cadence from walking pace up to the top of the bike speed range. Indexed shifting means each click lands on a defined cog rather than being trimmed by feel, and the wide ratio spread is what allows a rider to contribute meaningfully on a climb instead of leaving the whole job to the motor.
20 x 4.0 in Chaoyang Tires
Chaoyang 20 x 4.0 in casings on 20 in reinforced alloy rims spread the load across a large contact patch. Pressure is the main tuning control you have: firmer for tarmac and lower rolling resistance, softer for gravel, sand, wet grass and packed snow where the casing needs to deform and key into the surface.
LED Lighting and Backlit Display
An LED headlight and a brake-activated tail-light both run from the main pack, so there are no coin cells or separate USB lights to keep charged. The backlit display shows road speed, remaining charge, assist level, trip distance and total odometer, and switches between mph and km/h in the settings menu.
Rated for 400 lb (181 kg)
The frame, wheels and brakes are specified together for a combined rider-and-cargo figure of 400 lb (181 kg). That rating covers the rider, clothing, any luggage and anything strapped to a rack. Staying inside it is what keeps spoke tension, rim trueness and braking distance where the design intended them to be.
Full Specifications
Model
HKM-0794835 | Full-Suspension Electric Mountain Bike
Frame Material
Aluminum alloy dual-suspension frame
Motor
1500 W brushless rear hub, 2000 W peak
System Voltage
48 V DC
Battery
48 V 20 Ah lithium-ion (960 Wh), 21700 lithium, removable
Charger
Smart charger with 100-240 V input and an auto-cutoff indicator
Charging Time
6-7 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent of rated capacity
Top Speed
34 mph (55 km/h)
Range Per Charge
31-50 mi (50-80 km), varies with terrain, rider weight, tyre pressure and assist level
Climbing Grade
Up to approximately 33 degrees with a solo rider
Peak Torque
95 N.m
Drivetrain
7-Speed Shimano derailleur with indexed shifter
Brakes
Hydraulic disc brakes, front and rear from Zoom, with motor cut-off levers
Suspension
Full suspension: hydraulic fork plus rear coil shock
Tires
20 x 4.0 in Chaoyang all-terrain casings
Wheels
20 in reinforced alloy rims on stainless spokes
Saddle
Padded saddle with a quick-release seat clamp for tool-free height adjustment
Display
Backlit LCD: speed, charge level, assist mode, trip distance and odometer, switchable mph or km/h
Throttle and Assist
Twist throttle plus five levels of pedal assist and a zero-assist setting
Lighting
LED headlight and brake-activated tail-light, both powered from the main pack
Load Capacity
400 lb (181 kg) rider plus cargo
Vehicle Weight
Approximately 84 lb (38 kg) including the battery
Recommended Rider Height
5 ft 2 in to 6 ft 3 in (157-190 cm)
Certifications
CE and RoHS; battery cells UN38.3 tested, hydraulic system pressure tested
Battery, Range and Charging
The 48 V 20 Ah pack stores 960 Wh. For reference, a typical commuter e-bike ships with 400 to 600 Wh, so this pack sits well outside the usual energy budget. Cells are 21700 lithium, removable and the assembly is managed by a battery management system that balances the cells on every charge and isolates the pack on over-current, over-temperature or under-voltage.
Real-world range of 31-50 mi (50-80 km) depends on four variables far more than any others: how much you pedal, total loaded weight, tyre pressure and gradient. Throttle-only riding near 34 mph sits at the bottom of the band. Moderate assist on rolling ground sits in the middle. Light assist on flat ground with tyres at the upper end of their pressure range reaches the top figure. Ambient temperature below 40 F (4 C) temporarily costs 10 to 20 percent of usable capacity, and it returns as the pack warms.
Tip: Store the pack between 30 and 70 percent charge if the bike will stand unused for more than a month, and top it up every four to six weeks. Charging indoors at room temperature rather than in an unheated garage measurably extends usable pack life.
A full charge from empty takes 6-7 hours. Partial top-ups take proportionally less and there is no benefit in running the pack flat first. The pack unlocks with the supplied key and lifts out for indoor charging, or it can be charged in place through the frame-side port without removing anything.
Daily Use & Care
- Set tyre pressure for the surface you plan to ride. Firmer on tarmac for lower rolling resistance, softer on gravel and snow so the 20 x 4.0 in casing can deform and grip.
- Rinse the frame, rims and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks fasteners and finishes if it is left in place.
- Check axle hardware and stem bolts before the first ride of each week. Motor torque works fasteners loose faster than it does on a conventional bicycle.
- Wipe and re-lubricate the chain every 100 to 150 mi, or after any ride through standing water or heavy dust.
- Inspect pad thickness monthly and replace when the friction material is under 1 mm. Pads wear quietly right up to the point where they stop working.
- Charge the 960 Wh pack indoors at room temperature and unplug once the indicator turns green rather than leaving it connected for days.
- Keep the display cover and the charge-port cap closed whenever the machine is parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-0794835 full-suspension electric mountain bike, approximately 85 percent pre-assembled
- 1 x 48 V 20 Ah removable lithium pack (960 Wh)
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and a pedal spanner
- 1 x Pair of pedals
- 1 x LED headlight (pre-installed)
- 1 x User manual, assembly guide and warranty card
Frequently Asked Questions
How much assembly is needed out of the box?+
The HKM-0794835 ships roughly 85 percent assembled. What is left is fitting the front wheel, squaring and bolting the handlebar, installing the pedals and saddle, and checking brake alignment and axle torque. Budget 30 to 45 minutes with the supplied tools. If you are not comfortable setting brake and axle torque, have a bike shop do the final check.
What range should I actually plan for?+
Plan on 31-50 mi (50-80 km). Throttle-only riding near 34 mph lands at the low end. Moderate pedal assist on rolling ground lands in the middle. Light assist on flat ground with correctly inflated tyres reaches the top figure. A heavy rider, a headwind, cold weather or soft tyres will each take a visible bite out of the number.
How long does a full charge take?+
About 6-7 hours from empty with the supplied charger. Partial top-ups take proportionally less time, and there is no need to run the 960 Wh pack down before recharging. Charge indoors at room temperature on a non-flammable surface.
Is a licence or registration required?+
A machine of this output and speed sits outside the three-class e-bike framework used in most United States jurisdictions and is likely to be treated as a motor-driven cycle or as off-road equipment. Check your state vehicle code and any local ordinance before riding anywhere other than private land.
Can I ride it with the battery flat?+
Yes. The 7-Speed Shimano drivetrain works independently of the motor. At about 84 lb (38 kg) the bike is heavy to pedal unassisted, so treat it as a way to get home rather than a normal riding mode.
Is the battery removable for indoor charging?+
Yes. The 960 Wh pack unlocks with the supplied key and lifts out of its cradle, so it can be carried inside while the frame stays locked outdoors. It can also be charged in place through the frame-side port.
Will the brakes cope with the speed and the weight?+
Hydraulic disc brakes, front and rear are the appropriate specification for a 34 mph machine at 84 lb (38 kg). Bed the pads in over the first few rides with ten to fifteen progressive stops from moderate speed. Braking distance grows with load, so brake earlier when the bike is carrying cargo.
What tyre pressure should I run?+
For 20 x 4.0 in casings, run the upper part of the sidewall range on tarmac to cut rolling resistance, and drop toward the lower end for gravel, sand or packed snow so the casing can flatten and grip. Check pressure weekly; a soft tyre is the most common cause of a sudden drop in range.
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CERoHSUN38.3 Battery960 Wh PackHydraulic Brakes7-Speed Shimano400 lb Rated
Why Choose the HKM-0794835
Fat-Tyre Grip Without a Trail-Bike Riding Position
1500 W with genuine dual suspension on a compact 20 in wheelbase. The HKM-0794835 is specified as a whole rather than as a list of parts: the 960 Wh pack, the 1500 W motor and the aluminum alloy dual-suspension frame frame were chosen to work together for rough tracks, kerb-heavy urban riding and jump lines where the rear wheel needs somewhere to go.
Suspension That Earns Its Weight
Full suspension: hydraulic fork plus rear coil shock. Travel is not free; it adds weight, cost and one more thing to service. It is worth having here because small 20 in wheels react quickly and hit hard, which is exactly why this build puts travel at both ends rather than relying on tyre volume alone to smooth the ride.
Two Ways to Make It Move
Twist the throttle for immediate drive from a standstill, or use the 7-Speed Shimano and pedal. Most owners end up mixing the two: throttle to clear a junction, gears and legs to hold a cruising speed, and full assist reserved for gradients and headwinds. Mixing the two is also what produces the range figures at the upper end of the quoted band.
Braking Specified for the Speed
Sealed hydraulic disc brakes from Zoom are fitted at both ends. A 34 mph machine needs braking hardware chosen for that speed rather than carried over from a slower bike, and the motor cut-off switches in both levers mean the drive can never fight the brakes.
Running Costs Are the Quiet Advantage
A full charge of the 960 Wh pack costs a few cents of mains electricity and covers 31-50 mi. There is no fuel, no oil change and no emissions test, and the brushless drive produces no exhaust and very little noise, which matters on shared paths and in residential streets early in the morning.
Built to Be Left Outside and Used Again Tomorrow
Sealed connectors, a lockable battery cradle, an aluminum frame and disc braking that is unaffected by a wet rim are all choices that make sense for a machine that gets parked outdoors and ridden in whatever the weather is doing. Rinse road salt off after winter rides and the hardware will outlast the battery.
Controls & Indicators
Power Button
On the battery cradle; hold to switch the system on and off
Assist Buttons
Up and down keys on the display step through five assist levels plus zero
Twist Throttle
Right-hand grip, proportional response, independent of the assist level
Speedometer
Live road speed in mph, switchable to km/h in the settings menu
Charge Gauge
Segmented state-of-charge bar with a percentage readout on the display
Light Switch
Long-press the up key to toggle the headlight and tail-light
Shifter
Right-hand indexed shifter for the 7-Speed Shimano drivetrain
Pre-Ride Safety Checklist
- Check tyre pressure and set it for the surface you are about to ride.
- Squeeze both brake levers. They should firm up well before touching the grip, with no sponginess and no lever travel that keeps growing.
- Confirm the pack is seated and locked and that the display shows the charge you expect.
- Spin both wheels and check the rims run true with nothing rubbing a pad or the frame.
- Check axle hardware and any quick-release levers, and rock the machine with the front brake applied to confirm the headset has no play.
- Test the throttle at walking pace in a clear area before entering traffic or committing to a trail.
- Switch on the headlight and tail-light if you will be riding near dusk, and wear a helmet rated for 34 mph.
- Confirm nothing carried on a rack or in a bag can foul the wheels, the chain or the brake lines.
Quick Troubleshooting
The motor does nothing when I twist the throttle.+
Check that the display is on and showing charge, that the pack is locked into its cradle, and that both brake levers are fully released, because the cut-off switches disable the drive whenever 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 tyre pressure first; a soft tyre on tarmac is by far the most common cause. Then consider temperature, since cold reduces available capacity temporarily. If range is down more than 30 percent year-round after many charge cycles, the pack is approaching the end of its service life.
The brakes feel spongy or the lever pulls to the grip.+
Sponginess in a hydraulic system means air in the line or a fluid leak. Stop riding and have the system bled and inspected. Do not continue riding a 34 mph machine on compromised brakes.
The chain skips under load.+
Indexing is out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time until each click lands cleanly. If the skip only happens in the smallest cogs, the cassette is worn and should be replaced together with the chain.
The front end rattles or clunks over bumps.+
Confirm the axle is fully seated in the dropouts and that any quick-release lever is properly closed. If the noise persists, inspect the fork stanchions for scoring and check headset preload; a loose headset makes exactly this noise and will damage the bearings if it is left alone.
The display shows an error code and the machine will not move.+
Switch 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. Error codes map to specific faults in the controller, motor, throttle or battery circuits.
Certifications & Standards
The HKM-0794835 is produced in a facility operating an ISO 9001 quality management system. The 960 Wh 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 - Lithium battery transport safety testing, required for 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 1500 W machine capable of 34 mph. Read the manual in full before the first ride and practise throttle control in an open, traffic-free area until the response is predictable. Treat it as off-road equipment: it is not intended for public roads or shared-use paths.
- Wear a helmet on every ride. At 34 mph a standard bicycle helmet is the minimum; many riders choose a certified downhill or motorcycle helmet at these speeds.
- Do not exceed the 400 lb (181 kg) load rating, which includes the rider, clothing and everything carried.
- Check local law before riding on public roads or shared paths. A 1500 W motor with a 34 mph ceiling may place this machine outside standard e-bike classifications where you live.
- Bed the brake pads in with ten to fifteen 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 hub motor or the battery cradle.
- Charge only with the supplied charger, indoors, at room temperature and on a non-flammable surface. Do not leave a pack charging 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 descents. Wide tyres add grip but they do not remove the limit on available traction.
HKM-0794835 · 1500 W brushless rear hub · 48 V 20 Ah lithium (960 Wh) · 34 mph top speed · 31-50 mi range · 20 x 4.0 in Chaoyang tires · hydraulic disc brakes brakes · full suspension: hydraulic fork plus rear coil shock · 400 lb (181 kg) load capacity. Specifications are provided for reference; actual performance varies with rider weight, terrain, tyre pressure, temperature and riding style. Range figures are measured under moderate pedal assist on level ground. This page describes the product only and is not legal advice on vehicle classification - confirm local regulations before riding on public roads.
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