72V Dual-Battery Mid-Drive Electric Dirt Bike
HKM-3581651 Electric Dirt Bike
The HKM-3581651 sits at the top of the mid-drive off-road range: a 20000 W peak motor producing 500 N.m (369 lb-ft) of torque, fed by a dual-pack 72 V 45 Ah lithium system holding 3240 Wh. That combination returns up to 93 mi (150 km) of trail riding and a top speed of 62 mph (100 km/h). Five selectable gear ratios keep the motor in its efficient band from slow rock crawling to open desert, while full suspension, hydraulic disc brakes and a lightweight aluminum alloy frame keep the chassis composed under that much torque.
20000 W Peak Mid-Drive500 N.m (369 lb-ft) Torque72 V 45 Ah / 3240 Wh Dual Pack62 mph Top Speed93 mi Maximum Range5-Speed GearingFull SuspensionHydraulic Disc Brakes
Motor
20000 W
Peak mid-drive output, 500 N.m torque
Battery
72 V 45 Ah
3240 Wh across dual lithium packs
Top Speed
62 mph
100 km/h, off-road use
Range
Up to 93 mi
150 km on a full dual-pack charge
Suspension
Full
Long-travel fork and rear shock
Gearing
5-Speed
Selectable ratios, chain final drive
Overview
The HKM-3581651 is built for riders who have outgrown entry-level electric off-road machines. The headline figure is a 20000 W peak motor, but the number that changes how the bike rides is 500 N.m (369 lb-ft) of torque available from zero rpm. There is no clutch, no powerband and no lag: throttle input becomes wheel torque immediately, which is why the bike climbs steep, loose ground at walking pace as easily as it accelerates on a fire road.
Power is delivered through a mid-mounted drive unit and a chain, not a wheel hub. Keeping the motor in the chassis puts its mass low and central, leaves the rear wheel light enough for the suspension to track the ground properly, and lets the drive ratio multiply torque where it is needed. Five selectable gears extend that further, so the same machine works in tight woods and at 62 mph on open ground.
Energy comes from a dual-pack 72 V 45 Ah lithium system storing 3240 Wh. Splitting capacity across two packs keeps individual pack weight manageable for removal and indoor charging, and distributes mass in the frame rather than concentrating it in one large block. Maximum range is 150 km (93 mi) under favourable conditions, with a full charge taking roughly 5-8 hours.
The chassis is aluminum alloy, chosen to keep weight down without giving up the torsional stiffness a 500 N.m drivetrain demands. Long-travel suspension at both ends and hydraulic disc brakes complete a package that is intended for serious off-road terrain rather than gravel paths - rock, ruts, sand, jumps and sustained climbs.
Key Features
20000 W Peak Mid-Drive Motor, 500 N.m of Torque
A centrally mounted brushless motor delivers up to 20000 W peak and 500 N.m (369 lb-ft) of torque, with maximum torque available from a standstill. Mounting the drive unit in the chassis rather than the wheel keeps unsprung weight low so the suspension can do its job, and routes all output through gearing that multiplies wheel torque on climbs. Throttle response is measured in milliseconds.
Dual 72 V Lithium Packs, 45 Ah Combined (3240 Wh)
Two lithium packs give a combined 45 Ah at 72 V, or 3240 Wh of usable energy. Splitting the capacity keeps each pack light enough to carry indoors for charging and spreads mass through the frame instead of concentrating it. A battery management system monitors cell voltage, temperature and current across both packs. A full recharge takes approximately 5-8 hours.
Long-Travel Full Suspension
A long-travel front fork and a rear shock keep both tires loaded on surfaces that would deflect a rigid chassis - stutter bumps at speed, rock steps at walking pace, and landings off natural terrain features. Damping is tuned for the weight and power of the machine rather than borrowed from a bicycle, so the chassis stays settled when 500 N.m is applied on a loose climb.
Hydraulic Disc Brakes, Front and Rear
Sealed hydraulic lines and large rotors give the heat capacity and lever feel a 62 mph machine needs on a sustained descent. Effort stays light and predictable as the rotors heat, and there are no cables to stretch, corrode or pack with grit. Perforated rotor faces clear water and mud within the first rotation.
5-Speed Selectable Gearing with Chain Final Drive
Five ratios let you match the drivetrain to the terrain instead of compromising with a single fixed gear. Low ratios turn 500 N.m into slow-speed climbing torque and fine throttle control on technical ground; high ratios open the bike out to 62 mph on flat, fast terrain. The chain and sprocket set is heavy-duty and can be re-geared for a specific riding area.
Knobby Off-Road Tires on Spoked Wheels
Aggressive knobby tires on spoked rims deliver bite in loose soil, sand and mud, and the spoked construction absorbs impact energy that would crack a cast wheel. Spokes can be re-tensioned and a rim re-trued after a hard landing, which keeps a bike rideable on a multi-day trip far from a workshop.
LED Lighting and Waterproof Instrument Display
A sealed display reports speed, combined state of charge, selected gear and trip distance, and remains legible in direct sun. LED headlight and tail light draw from the main system, so a ride that runs past sunset does not depend on a separate torch or an add-on battery.
Aluminum Alloy Frame and Reinforced Swingarm
The aluminum alloy frame keeps overall weight down while resisting flex under acceleration and cornering loads that a 500 N.m drivetrain generates. The swingarm is reinforced with sealed pivot bearings so the rear wheel tracks true through rough terrain, and motor and battery mass sit low and central for predictable handling.
Full Specifications
Model
HKM-3581651 | Electric Dirt Bike
Frame Material
Lightweight aluminum alloy with reinforced swingarm
Motor
20000 W peak mid-drive brushless motor
System Voltage
72 V DC
Battery
Dual lithium packs, 72 V 45 Ah combined (3240 Wh)
Charger
Smart charger with LED status, 110-240 V input
Charging Time
Approximately 5-8 hours from empty
Battery Cycle Life
Approximately 800-1000 full cycles to 80 percent capacity
Top Speed
62 mph (100 km/h)
Range Per Charge
Up to 93 mi (150 km), varies with terrain, rider weight, and gear selection
Gradeability
Steep grades in the lower gear ratios; limited by traction rather than power
Peak Torque
500 N.m (369 lb-ft)
Final Drive
Heavy-duty chain and sprocket
Brakes
Hydraulic disc brakes, front and rear
Suspension
Full suspension: long-travel front fork and rear shock
Tires
Knobby off-road tread, front and rear
Wheels
Spoked rims with re-tensionable stainless spokes
Riding Position
Flat off-road seat and wide handlebar for seated or standing riding
Display
Waterproof display: speed, combined state of charge, gear, trip distance
Throttle
Ride-by-wire twist throttle with progressive mapping
Lighting
LED headlight and tail light powered by the main system
Intended Rider
Adult riders with off-road experience
Transmission
5-speed selectable gearing
Intended Use
Off-road recreational use on private land and designated riding areas
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The dual-pack system holds 72 V 45 Ah, or 3240 Wh of energy. Two packs rather than one keeps each unit light enough to lift out and carry indoors, and spreads the mass through the frame instead of hanging one large block in a single location. That capacity is what supports a 150 km (93 mi) maximum range on a machine capable of drawing 20000 W at peak.
Real-world range moves with gear selection, terrain and throttle habit. Steady cruising in a high ratio on flat, firm ground approaches the stated maximum; sustained low-gear climbing, deep sand and heavy throttle use will reduce it substantially. Cold weather temporarily trims available capacity and it returns once the packs warm. A full charge from empty takes approximately 5-8 hours.
Tip: Charge both packs together and keep them at similar states of charge. Long-term storage between 30 and 80 percent, away from temperature extremes, is the single largest factor in reaching the rated 800-1000 cycle service life.
Because capacity is split across two packs, a rider who mostly does shorter loops can charge and cycle both packs evenly rather than deep-discharging one large pack every ride - shallow cycles are measurably easier on lithium cells than deep ones.
Daily Use & Care
- Check chain tension and lubrication before every ride day. With 500 N.m passing through it, a slack chain on a mid-drive is the fastest way to end a ride early.
- Clean and lubricate the chain every 200-300 mi, and more frequently after sand or mud where grit gets packed into the rollers.
- Inspect spoke tension after hard landings and rocky rides. A single loose spoke untrues a wheel progressively and the rate accelerates.
- Wipe suspension stanchions and wiper seals after dusty rides so grit is not dragged past the seals on the next compression.
- Check brake pad thickness regularly. Pads on a 62 mph machine wear quietly on long descents and give little warning.
- Rinse mud off with a hose rather than a pressure lance; direct high-pressure water forces grit past bearing seals and connector gaskets.
- Keep both battery interfaces clean and dry, and charge indoors at room temperature on a non-flammable surface.
What's in the Box
- 1 x HKM-3581651 electric dirt bike, largely pre-assembled
- 2 x 72 V lithium battery packs, 45 Ah combined
- 1 x Smart charger with LED status indication, 110-240 V input
- 2 x Battery keys
- 1 x Toolkit for chain, spoke and fastener adjustment
- 1 x Front wheel spindle and axle hardware
- 1 x Handlebar and control assembly hardware
- 1 x User manual and pre-ride inspection guide
Frequently Asked Questions
What does 20000 W actually mean in practice?+
It is the peak output the drive system can produce for short bursts - hard acceleration, a steep climb, pulling out of a rut. Continuous output during normal trail riding is far lower. The figure that changes how the bike feels day to day is the 500 N.m (369 lb-ft) of torque available from zero rpm.
Why five gears on an electric bike?+
Electric motors have a wide usable range but they are still most efficient inside a band. Five ratios let you keep the motor in that band whether you are crawling over rock at walking pace or holding 62 mph across open ground, which improves both control and range compared with a single fixed ratio.
How far will it really go on a charge?+
Up to 93 mi (150 km) under favourable conditions - steady speed, firm ground, moderate throttle. Aggressive riding, deep sand, sustained climbing and low temperatures will reduce that significantly. Treat the figure as a ceiling and plan a loop with margin the first few times you ride it.
Can I remove the batteries to charge them indoors?+
Yes. Both packs release on keyed mounts and lift out, which is the practical option when the bike lives in an unpowered garage or on a trailer. Charging in place also works. Keep the two packs at similar states of charge.
Is it road legal?+
No. The HKM-3581651 is not homologated for public road use. It is built for private land and designated off-road riding areas. Rules vary by state and locality, so confirm local regulations before transporting or riding it anywhere other than private property.
What maintenance does it need compared with a combustion dirt bike?+
Considerably less. Lubricate and tension the chain, inspect brake pads, check spoke tension and keep the suspension clean. There is no engine oil, air filter, spark plug, carburetor or fuel system to service.
Is this suitable for a first electric off-road machine?+
It is a high-output machine and rewards experience. A rider new to off-road should start in a low gear ratio with a light throttle hand on open, flat ground and build up. Riders coming from combustion dirt bikes usually adapt quickly, since the chassis and ergonomics are familiar.
Can it be ridden in wet conditions?+
Rain, puddles and shallow crossings are within the design envelope, and the display and connectors are sealed against splash. Do not submerge the packs or the motor. Rinse and dry the bike after riding in mud so grit is not left sitting against seals.
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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 Battery3240 Wh Dual Pack5-SpeedFull SuspensionHydraulic Discs
Why Choose the HKM-3581651
Torque That Removes the Technique Barrier
500 N.m from zero rpm means you do not need clutch control or engine revs to get out of a rut or over a rock step. Traction management becomes purely a matter of throttle finesse, which is a far shorter learning curve than gearbox and clutch timing on a combustion machine.
Mid-Drive Geometry, Not a Heavy Hub
Putting the motor in the chassis keeps unsprung mass off the rear wheel, so the suspension follows the ground rather than fighting a heavy hub. It also makes rear wheel removal a trailside job and lets the drive ratio multiply torque where you actually need it.
Two Packs, One System
Splitting 3240 Wh across two packs distributes mass in the frame and keeps each unit light enough to carry indoors. It also means shallower cycles per pack over the life of the bike, which lithium cells tolerate considerably better than repeated deep discharges.
Quiet Enough to Keep Trails Open
No exhaust and no fumes means riding areas that restrict combustion machines frequently remain open to electric ones. Riding without noise also means not disturbing wildlife, livestock or other trail users, which is often what keeps access available.
Running Costs Drop to Consumables
No fuel, no oil, no filters, no plugs and no carburetor. Charge, check chain tension, ride. What remains is tires, brake pads, the chain and periodic suspension service - the same items you would replace on any off-road machine.
Sealed for Real Conditions
Sealed connectors, gasketed battery interfaces, a waterproof display and shielded swingarm pivot bearings mean rain, mud and shallow water are conditions the bike is designed around rather than exceptions to be avoided.
Controls & Indicators
Ignition
Keyed power switch arms the controller and wakes the display
Gear Selector
Handlebar-mounted selector moves between the five gear ratios
Throttle
Ride-by-wire twist throttle with progressive mapping
Speedometer
Live speed readout in mph, switchable to km/h
Battery Readout
Combined state of charge and live system voltage on the display
Kill Switch
Handlebar cut-off isolates motor drive immediately
Diagnostics
On-screen error codes report motor, battery, controller and sensor faults
Pre-Ride Safety Checklist
- Check tire pressure and set it for the surface: firmer for hardpack and fire road, softer for sand and loose rock.
- Check chain tension and lubrication before every ride day; a high-torque mid-drive is unforgiving of a slack chain.
- Squeeze both brake levers. They should firm up well before the grip, with no sponginess that would indicate air in the line.
- Confirm both battery packs are locked in place and the display shows the expected combined state of charge.
- Spin both wheels and check spoke tension, rim trueness and that nothing rubs the rotors.
- Verify axle nuts, triple clamp bolts and swingarm pivot fasteners are torqued to specification.
- Select a low gear ratio and test the throttle at walking pace in a clear area before moving into the higher ratios.
- Wear a certified off-road helmet, goggles, gloves, boots and body armour appropriate to a 62 mph machine.
Quick Troubleshooting
The motor does not respond to the throttle.+
Confirm the ignition is on, the display is powered and showing charge, both packs are locked in, the kill switch is in the run position and both brake levers are released. If the display reports an error code, note it before contacting support.
Power fades on long climbs.+
Thermal roll-back is normal protective behaviour when sustained high output is demanded in hot conditions. Allow the motor to cool and check that cooling surfaces are not packed with mud. Persistent fade at moderate temperature warrants a controller and temperature-sensor check.
One battery pack drains faster than the other.+
Small differences are normal, but a large imbalance usually means one pack was charged to a different level or a connector is not fully seated. Charge both to full, reseat the connectors and monitor. If the imbalance persists, have the pack tested.
The chain jumps or derails under hard acceleration.+
Tension is almost always the cause. Re-tension to specification and confirm the rear wheel is square in the swingarm. Inspect the sprocket teeth for hooking and the chain for elongation, and replace chain and sprockets as a set once either is worn.
The rear suspension bottoms out on landings.+
Increase preload and add damping in small increments, testing between each change. If the shock still bottoms at maximum preload for your weight, the spring rate is too soft for how you ride and should be changed.
The display shows an error code and the bike will not move.+
Switch the ignition off, wait 30 seconds and restart. If the code returns, record the exact code and the conditions that produced it, then contact support - codes map to specific faults in the motor, battery, controller or sensor circuits.
Certifications & Standards
The HKM-3581651 is produced in a facility operating under an ISO 9001 quality management system. The lithium cells and both assembled packs 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 packs on request.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is a high-output off-road electric motorcycle capable of 62 mph (100 km/h) with 500 N.m of torque available from zero rpm. It is intended for adult riders with off-road experience, on private land or in designated riding areas. Read the manual fully and build up through the gear ratios rather than starting in a high one.
- Wear a certified off-road motorcycle helmet, goggles, gloves, boots and body armour on every ride.
- The HKM-3581651 is not homologated for public road use. Ride on private land or in designated off-road riding areas only.
- Peak torque is available from a standstill. Practise throttle control in a low gear ratio on open ground before riding technical terrain.
- Bed in the brake pads with 10-15 progressive stops during the first ride before riding at speed or on long descents.
- Do not submerge the battery packs or the motor. Rain, splashes and shallow crossings are acceptable; deep water is not.
- Charge only with the supplied charger, indoors, at room temperature, and on a non-flammable surface. Do not leave charging packs unattended overnight.
- Do not open, puncture or modify either battery pack. Damaged lithium packs can vent and ignite.
- Reduce speed substantially on wet rock, loose sand and steep descents; knobby tires and long-travel suspension improve control but do not eliminate the risk of losing traction.
HKM-3581651 · 20000 W peak mid-drive motor · 500 N.m (369 lb-ft) torque · 72 V 45 Ah dual lithium packs (3240 Wh) · 62 mph (100 km/h) top speed · up to 93 mi (150 km) range · 5-8 h charge · 5-speed selectable gearing · full suspension · hydraulic disc brakes · knobby off-road tires · aluminum alloy frame. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, gear selection, and riding style. Range figures represent favourable conditions. This machine is intended for off-road recreational use and is not homologated for public roads. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding.
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