Aluminum-Chassis Mid-Drive Electric Dirt Bike
HKM-4007635 Electric Dirt Bike
Power is easy to buy and hard to use. The HKM-4007635 spends its engineering budget on the parts that turn 6,500 W and 233 Nm into something controllable: an aluminum alloy frame built to resist torsional flex, independently damped suspension at both ends, sealed hydraulic brakes that self-adjust as they wear, and a 2,400 Wh pack managed cell by cell. The result is a machine that stays composed on the third hour of a ride, not just the first ten minutes.
6,500 W Peak Mid-DriveAluminum Alloy Chassis233 Nm (171.9 lb-ft)60 V 40 Ah / 2,400 WhUp to 74.6 mi Range31+ mph Top SpeedFull SuspensionHydraulic Disc Brakes
Motor
6,500 W
Peak output, mid-drive
Battery
60 V 40 Ah
2,400 Wh lithium-ion
Top Speed
31+ mph
50+ km/h
Range
74.6 mi
Up to 120 km per charge
Wheels
19 in
Spoked, knobby off-road tires
Torque
233 Nm
171.9 lb-ft maximum
Overview
The frame is where a dirt bike is won or lost, and this one is aluminum alloy chosen for a specific pair of properties: a high strength-to-weight ratio and a natural ability to damp vibration. Lower mass makes the bike easier to place at low speed and lets the suspension respond faster. Resistance to torsional flex is what keeps the front and rear wheels pointing at the same thing when 233 Nm is being fed into the rear tire in a rutted corner.
Geometry follows from that. The chassis is laid out to work in two positions rather than one - seated for covering ground and standing for technical terrain - so the bar height, seat profile, and peg placement have to co-operate rather than favour a single posture. A frame that is comfortable only when seated becomes exhausting the moment the ground gets rough.
The powertrain is mounted into the middle of that structure. A mid-drive motor producing up to 6,500 W peak keeps its mass sprung and central instead of hanging in the rear wheel, which lowers the polar moment of inertia and reduces the unsprung weight the rear shock has to control. A single-speed transmission takes the output straight to the rear wheel, and a freewheel hub lets the wheel overrun the drive when you coast.
Energy comes from a 60 V 40 Ah lithium pack holding 2,400 Wh, good for up to 74.6 mi (120 km) when conditions co-operate. Cell voltage, pack temperature, and cycle count are monitored continuously by the battery management system - not to add a feature to a list, but because pack longevity in a vibrating, temperature-cycled off-road environment depends on it.
Key Features
Mid-Drive Motor, 6,500 W Peak
Centre-mounted rather than wheel-mounted. Two things improve at once: the mass sits low and between the axles so the chassis changes direction more readily, and the rear suspension controls a lighter wheel so it tracks broken ground more accurately. Peak torque of 233 Nm is available from a standing start.
60 V 40 Ah Lithium Pack, 2,400 Wh
A substantial energy reserve supporting up to 74.6 mi (120 km) in favourable conditions. Lithium-ion is used for energy density and cycle life, and the battery management system continuously watches cell voltage, pack temperature, and charge cycles - the three variables that determine how the pack ages.
Full Suspension, Weight-Calibrated
A dedicated front fork and rear shock, damped independently and calibrated for a broad range of rider weights and terrain conditions. Independent damping keeps both tires loaded through rock and washboard, and an isolated chassis measurably reduces rider fatigue on a long off-road day.
Hydraulic Disc Brakes, Front and Rear
Fluid transmits lever force with none of the friction, stretch, or contamination of a cable run. Modulation is finer, lever effort is lower on long descents, and the system compensates automatically as pad material wears away. Sealed lines are indifferent to the mud and water that make cable brakes vague.
Single-Speed Transmission
A fixed ratio between motor and rear wheel with no clutch. Electric motors make peak torque at zero rpm, so there is nothing for a gearbox to correct at low speed and nothing for a clutch to decouple at rest. Fewer components means fewer wear items and no interruption in power delivery.
Knobby 19-Inch Off-Road Tires
70/100-19 at the front and 80/100-19 at the rear on spoked wheels. Tall sidewalls take the edge off impacts the suspension does not catch, and the open tread pattern is designed to eject mud and debris so the knobs keep biting instead of packing solid.
Freewheel Rear Hub
A one-way mechanism in the rear hub disconnects the drivetrain from the wheel whenever the motor is not driving. Coasting and descending cost nothing in parasitic drag, which improves both efficiency and the ease of carrying momentum. Opening the throttle re-engages the drive smoothly.
Toolkit Supplied, Weather-Resistant Build
The toolkit covers the field checks that off-road vibration makes necessary - fasteners, chain tension, lever position. Water-resistant construction means rain, spray, and mud sit inside the design envelope rather than outside it, so weather changes the ride rather than ending it.
Full Specifications
Model
HKM-4007635 | Electric Dirt Bike
Frame Material
Aluminum alloy, high strength-to-weight with inherent vibration damping, engineered against torsional flex
Motor
Mid-drive brushless motor, 6,500 W peak output
System Voltage
60 V DC
Battery
60 V 40 Ah lithium-ion, 2,400 Wh total energy
Charger
Supplied charger, 100-240 V mains input
Charging
Charge indoors at room temperature; the BMS terminates the cycle at target cell voltage
Battery Management
Continuous monitoring of cell voltage, pack temperature, and charge cycles
Top Speed
31+ mph (50+ km/h)
Range Per Charge
Up to 74.6 mi (120 km) in favourable conditions; sustained off-road use consumes considerably more energy per mile
Climbing Capability
Steep and loose inclines can be attempted from a standstill on full torque
Maximum Torque
233 Nm (171.9 lb-ft)
Transmission
Single-speed gear system, clutchless, direct rear-wheel drive
Brakes
Hydraulic disc front and rear, sealed lines, self-adjusting for pad wear
Suspension
Full suspension: independent front fork and rear shock, calibrated for a broad range of rider weights
Tires
70/100-19 front, 80/100-19 rear, open knobby tread for mud clearing
Wheels
19 in spoked wheels, front and rear
Seat
Flat dirt-bike saddle allowing fore-and-aft movement under load
Display
Handlebar display for road speed and battery state of charge
Throttle
Twist throttle with immediate response and no rev build-up
Drive Electronics
Brushless controller managing delivery from the 60 V bus to the mid-drive motor
Intended Use
Adult single-rider off-road and mixed-surface riding
Water Resistance
Water-resistant construction protecting the electrical system from rain, spray, and mud
Ergonomics
Bar height, seat profile, and peg placement laid out to work seated and standing
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The pack is a 60 V lithium unit with 40 Ah of capacity - 2,400 Wh in total. Lithium-ion is specified over sealed lead-acid for three reasons that matter on an off-road machine: far more energy per kilogram, a much lower self-discharge rate between rides, and a longer usable cycle life. The weight saved goes back into the chassis as handling.
Up to 74.6 mi (120 km) is the range in favourable conditions. Rider weight, gradient, ambient temperature, tire pressure, and how much of the ride is spent at full throttle all move it, and technical off-road riding moves it most because you accelerate constantly. Cold weather temporarily reduces the capacity the pack can deliver; that capacity returns as the cells warm back up.
Tip: The battery management system balances cells, watches pack temperature, and ends the charge at the correct voltage. It cannot protect a pack from being charged while hot or from crash damage, so let the pack cool before charging and retire any pack that has taken a significant impact.
For winter storage, leave the pack at a partial state of charge in a cool, dry place and top it up periodically rather than storing it flat or fully charged. Those two extremes are what age lithium cells fastest over a long idle period.
Daily Use & Care
- Set tire pressure before every ride to suit the surface. It is the fastest adjustment available and it changes grip, comfort, and range together.
- Wash mud off before it dries, concentrating on fork stanchions, the shock shaft, and both brake rotors where dried grit does structural harm.
- Re-torque axle nuts, clamp bolts, rotor bolts, sprocket bolts, and footpeg mounts on a schedule. Off-road vibration undoes fasteners steadily.
- Keep the chain clean, lubricated, and tensioned to specification. A single fixed ratio carrying 233 Nm punishes neglect quickly.
- Check brake pad thickness monthly and after any ride through deep mud, sand, or standing water.
- Charge indoors at room temperature on a non-flammable surface, and allow a hot pack to cool before connecting the charger.
- Inspect fork seals and the shock body for oil film every wash. A weeping seal caught early is a minor service item.
What's in the Box
- 1 x HKM-4007635 electric dirt bike
- 1 x 60 V 40 Ah lithium battery pack (2,400 Wh)
- 1 x Battery charger, 100-240 V input
- 1 x Toolkit for routine maintenance and adjustment
- 1 x Handlebar control assembly, pre-fitted
- 1 x Pair of footpegs, pre-fitted
- 1 x Front wheel and axle hardware for final assembly
- 1 x User manual with maintenance schedule
Frequently Asked Questions
Why aluminum alloy for the frame?+
Two properties. First, a high strength-to-weight ratio - the frame can be stiff without being heavy, which makes the bike easier to place at low speed and lets the suspension react faster. Second, aluminum damps vibration naturally, which matters over hours of rough ground. Both contribute to a chassis that stays predictable under high torque.
What does resisting torsional flex actually change?+
Under hard drive or hard braking, a frame that twists lets the front and rear wheels point in slightly different directions. The rider feels that as vagueness and has to correct constantly. A torsionally rigid frame keeps the geometry stable, so where you point the bike is where it goes.
How much range should I plan for?+
Up to 74.6 mi (120 km) is the maximum under favourable conditions. Real trail riding uses more energy per mile because of constant acceleration, climbing, and soft ground. Ride your usual terrain once while watching the state-of-charge indicator and use that as your planning figure.
Is there anything to learn if I have never ridden a dirt bike?+
Yes, but less than on a combustion machine. There is no clutch, no gearbox, and nothing to stall. That leaves throttle control, braking, and body position - which are the skills worth practising anyway. Start on open, level ground and build up gradually.
What does the freewheel rear hub contribute?+
It disconnects the drivetrain from the rear wheel when you are not on the throttle, removing drag on descents and coasting sections. That improves efficiency and lets the bike carry momentum, and the drive re-engages automatically the moment power is requested.
How is the pack protected?+
A battery management system monitors cell voltage, pack temperature, and cumulative charge cycles continuously, and terminates charging when cells reach target voltage. That protects against overcharge, deep discharge, and thermal problems, and it keeps cells balanced so the pack ages evenly.
Can I use it in wet weather?+
Yes. Construction is water-resistant and the hydraulic brakes are sealed. Rain, spray, and mud are normal operating conditions. Do not ride through deep water and do not pressure-wash electrical enclosures or suspension seals.
Do I need a licence?+
That depends entirely on jurisdiction, and rules generally turn on power and speed thresholds. Ride on private land or in sanctioned off-road areas, and consult your local transport authority before using any public road or trail.
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 BatteryAluminum Chassis2,400 Wh PackFull SuspensionHydraulic Brakes
Why Choose the HKM-4007635
The Chassis Comes First
A powerful motor bolted into a flexible frame is a bike that fights its rider. Starting with a torsionally rigid aluminum structure and hanging the powertrain in the middle of it is the order these decisions have to be made in.
Composure Under Sustained Load
Rock, rut, and washboard test suspension calibration and frame rigidity far more than a short blast on smooth ground does. The specification here - independent damping, weight-calibrated units, sealed brakes - is aimed at the third hour rather than the first.
Simplicity as a Design Choice
No clutch, no gearbox, no shift lever. Removing those is not a cost saving; it is the correct engineering answer for a motor that produces peak torque at zero rpm. Fewer parts means fewer wear items and fewer inputs to manage.
Refined, Not Just Powerful
A brushless drive with no exhaust and no gear whine leaves tire noise and suspension movement as the dominant sounds. That refinement is pleasant, and it is also what keeps riding areas open where noise limits apply.
Nothing to Burn, Nothing to Spill
Zero tailpipe emissions in use, no fuel to store or mix, and no oil to leak in a trailer or garage. The energy cost of a full 2,400 Wh charge is a small fraction of the petrol needed for a comparable distance.
Sealed Against the Environment
Water-resistant electrical construction and sealed hydraulic lines address the same failure mode: contamination reaching components whose performance and life degrade fastest when it does.
Controls & Indicators
Power Switch
Energises the drive system; the throttle is inactive until the bike is powered up
Handlebar Switchgear
Controls grouped within thumb reach; the left bar carries no clutch lever
Twist Throttle
Right-hand grip with immediate torque delivery; apply it progressively on loose surfaces
Speed Readout
Live road speed shown on the handlebar display
Battery Gauge
State-of-charge indicator for the 2,400 Wh pack
Brake Levers
Independent hydraulic levers operating the front and rear calipers
Suspension Preload
Fork and shock preload set to match rider weight and terrain
Pre-Ride Safety Checklist
- Work around the bike with the supplied toolkit checking axles, clamps, rotor bolts, sprocket bolts, and footpeg mounts.
- Set tire pressures deliberately for the surface you intend to ride rather than leaving them from the last outing.
- Pull both brake levers hard; pressure must build well before the lever approaches the grip, with no soft travel.
- Confirm the pack is secure, the connectors are clean and dry, and the display reports the expected state of charge.
- Compress the fork and rear shock through their travel and check for smooth rebound and dry, unscored seals.
- Spin both wheels to check for buckle, loose spokes, and rotor-to-pad clearance.
- Take a slow lap of open ground on light throttle to confirm drive and brake response before entering terrain.
- Ride in a certified off-road helmet, goggles, gloves, boots, and body protection, and let someone know your route.
Quick Troubleshooting
The display is on but the bike will not drive.+
Confirm the battery connector is fully seated and the pack shows charge, that neither brake lever is being held, and that any kill switch is in the run position. Record any fault code exactly before cycling power, then contact support with it.
Range is well short of the quoted maximum.+
The 74.6 mi figure assumes favourable conditions. Cold cells, low tire pressure, a heavier rider, soft ground, gradient, and sustained full throttle each subtract from it. Check tire pressure and pack temperature before suspecting a fault.
The bike feels vague through fast, rough corners.+
Check suspension preload and tire pressure first, since both change how the chassis loads up. Then verify axle and clamp torque - a loose axle or triple clamp introduces exactly the kind of imprecision that feels like frame flex.
One brake has lost pressure at the lever.+
Air ingress or a fluid leak in a sealed hydraulic system. Inspect lines, fittings, and calipers for wetness, stop riding, and have the system bled and checked before the next outing.
The suspension bottoms out or knocks.+
Set preload for your weight first - a unit that is too soft will use all its travel and knock at the end of the stroke. If preload is correct, inspect stanchions and shock body for scoring and oil film, which indicate a seal in need of service.
The chain is noisy or the drive feels notchy.+
Check tension against the manual specification and inspect the sprocket for hooked teeth. Chain and sprocket wear as a matched pair under this much torque, so replace them together rather than fitting a new chain to a worn sprocket.
Certifications & Standards
The HKM-4007635 is manufactured in a facility operating under an ISO 9001 quality management system. The lithium 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 shipping lithium-ion 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 machine produces up to 6,500 W and 233 Nm of torque, available from a standing start with no clutch to modulate it. Read the manual before the first ride and use open, level ground to calibrate your throttle hand before riding technical terrain. Off-road riding carries inherent risk of injury even with correct equipment and technique.
- Wear a certified off-road helmet, goggles, gloves, boots, and body protection on every ride.
- Ride on private land or in sanctioned off-road areas, and confirm local law before using any public road, path, or trail.
- Full torque is available instantly. Open the throttle progressively, particularly on loose, wet, or steep ground.
- Bed the brake pads in with a series of progressive stops on the first rides before relying on full braking performance.
- Water resistance covers rain, spray, and mud. Do not submerge the bike, cross deep water, or pressure-wash electrical enclosures or suspension seals.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface, and never leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack, and never charge a pack that has sustained crash damage.
- The bike is designed for a single rider. Do not carry a passenger or fit additional seating.
HKM-4007635 · 6,500 W peak mid-drive motor · 233 Nm (171.9 lb-ft) maximum torque · 60 V 40 Ah lithium-ion (2,400 Wh) · 31+ mph (50+ km/h) top speed · up to 74.6 mi (120 km) range · aluminum alloy frame · single-speed clutchless transmission · full suspension · hydraulic disc brakes · 70/100-19 front and 80/100-19 rear knobby tires on 19 in spoked wheels · freewheel rear hub · water-resistant construction. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. The range figure is a maximum measured under favourable conditions and does not represent sustained off-road riding. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding.
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