52 V Fat-Tire Electric Mountain Bike with 2000 W Dual-Drive Hub
HKM-8267475 Electric Mountain Bike
The HKM-8267475 runs on 52 volts rather than the usual 48, and that choice shapes the whole bike. Higher system voltage means the controller pulls less current to make the same power, which reduces heat in the wiring and the motor and keeps voltage sag under control when a 2000 W dual-drive hub is working hard. Behind it sits a 22.4 Ah pack holding roughly 1165 Wh, good for a quoted 60+ km (37+ mi). The chassis is aluminum alloy, the tires are 26 x 4.0 in fat rubber, and a 7-speed drivetrain, hydraulic discs, a suspension fork, and a colour LCD complete the specification.
2000 W Dual-Drive Hub Motor52 V 22.4 Ah / 1165 Wh Pack52 V High-Voltage System37+ mi Range26 x 4.0 in Fat TiresHydraulic Disc Brakes7-Speed DrivetrainColour LCD Display
Motor
2000 W
52 V dual-drive rear hub
Battery
52 V 22.4 Ah
1165 Wh lithium pack
Top Speed
31 mph
Approximately 50 km/h
Range
37+ mi
60+ km per charge
Tires
26 x 4.0 in
Fat tread, all-terrain
Load Capacity
330 lb
150 kg rider plus cargo
Overview
Almost every e-bike in this class runs a 48 V system. The HKM-8267475 runs 52 V, and the reason is straightforward physics: power is voltage multiplied by current, so raising the voltage lets the controller deliver the same 2000 W while drawing roughly eight percent less current. Less current means less resistive heating in the cables, connectors, controller, and motor windings, and it means less voltage sag when the motor is loaded on a climb. The practical result is a drive that holds its performance better as the pack discharges.
The motor is a 2000 W dual-drive brushless unit built into the rear hub. Placing it in the wheel keeps the drive path simple - no secondary chain, no belt, no gearbox - and puts all available torque on tap from a standstill. That is what gives the bike its authority pulling away from a stop or restarting partway up a loose climb, where a lower-powered hub would need a run-up.
Energy comes from a 22.4 Ah pack on the 52 V bus, roughly 1165 Wh. The manufacturer quotes over 60 km (37+ mi) per charge. That figure reflects real riding rather than a laboratory ideal case, and how close you get to it depends mostly on how much of the work you let the motor do. A full charge from empty takes approximately 7-9 hours on the supplied charger.
The rest of the build is oriented toward mixed-surface riding. The aluminum alloy frame keeps weight sensible for a bike carrying a pack this size. 26 x 4.0 in fat tires give a large contact patch for grip on mud, gravel, sand, and snow. A suspension fork handles the front-end impacts, hydraulic disc brakes provide fade-resistant stopping, a 7-speed derailleur covers the cadence range, and a colour LCD keeps the ride data legible in daylight.
Key Features
2000 W Dual-Drive Brushless Rear Hub Motor
The motor is laced directly into the rear wheel and delivers 2000 W through a dual-drive configuration. With no gearbox or secondary chain in the drive path, losses stay low and there is nothing to adjust or replace. Full torque is available from zero rpm, which is what a loaded start or a steep, loose pitch actually requires.
52 V 22.4 Ah Lithium Pack (1165 Wh)
Roughly 1165 Wh supports the quoted 60+ km (37+ mi) and comfortably covers a week of commuting between charges. The 52 V architecture also means the pack sits at a higher voltage through most of its discharge curve, so the bike feels consistent rather than tailing off noticeably in the last quarter of the charge. A full charge takes approximately 7-9 hours.
Front Suspension Fork
A sprung fork absorbs the impacts the tires cannot - kerb transitions, root crossings, and the square edges of broken pavement - keeping the front wheel in contact with the ground where it can steer and brake. Combined with 4 in of tire volume, the front end stays composed on surfaces that would unsettle a rigid commuter bike.
Hydraulic Disc Brakes with Hydraulic Pad Actuation
Sealed hydraulic lines actuate both calipers, so lever effort stays light and the bite point stays consistent as the rotors heat up on a long descent. There are no cables to stretch, contaminate, or corrode. Discs also keep full power when the rims are wet or caked in mud, which matters on a fat-tire bike ridden off pavement.
7-Speed Derailleur Drivetrain
A 7-speed rear derailleur with an index shifter gives usable pedalling cadence from a slow climb to a cruising pace. Pedalling in the right gear alongside the motor lowers the current the controller has to supply, which both extends range and keeps the pack and motor cooler on sustained climbs.
26 x 4.0 in Fat All-Terrain Tires
Twenty-six inch rims with 4 in casings combine the rolling ability of a full-size wheel with the flotation of a fat tire. Run 15-20 psi on pavement for efficiency, or drop to 10-12 psi for mud, sand, gravel, or snow so the casing can spread and find grip where a narrow tire would cut through and slide.
LED Headlight Powered by the Main Pack
Lighting runs from the 1165 Wh main battery, so there is nothing separate to charge before an early start or a ride home after dark, and the beam stays at full brightness for the whole ride rather than fading as a small set of cells drains.
Colour Options and a 330 lb Load Rating
The chassis carries a combined rider-and-cargo rating of 150 kg (330 lb), enough for a larger rider with a loaded pack. Frame colour options are available, so the bike can be specified to taste rather than accepted in whatever finish is in stock.
Full Specifications
Model
HKM-8267475 | Electric Mountain Bike
Frame Material
Aluminum alloy, mountain geometry
Motor
2000 W dual-drive brushless rear hub motor
System Voltage
52 V DC
Battery
52 V 22.4 Ah lithium-ion (1165 Wh)
Charger
Smart charger, 100-240 V input
Charging Time
Approximately 7-9 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
Approximately 31 mph (50 km/h)
Range Per Charge
Over 37 mi (60+ km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 30 degrees with a solo rider
Drive Layout
Direct rear hub drive, no secondary chain or belt
Drivetrain
7-speed derailleur with index shifter
Brakes
Hydraulic disc brakes, front and rear
Suspension
Front suspension fork
Tires
26 x 4.0 in fat tires, all-terrain tread
Wheels
26 in alloy rims, stainless spokes
Saddle
Padded saddle on adjustable seatpost
Display
Colour LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with multi-level pedal-assist and zero assist
Lighting
LED headlight powered by the main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 73 lb (33 kg) including battery
Frame Finish
Multiple colour options available
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 52 V 22.4 Ah pack stores roughly 1165 Wh. The unusual part is not the capacity but the voltage. A 52 V system delivers the same power at lower current than a 48 V system, and current is what generates heat in cables, connectors, and motor windings. Lower current also means less voltage sag under load, so the bike holds its performance on a long climb and through the lower part of the discharge curve rather than feeling progressively weaker.
The manufacturer quotes over 60 km (37+ mi) per charge. Riding with moderate pedal-assist on mixed surfaces at correct tire pressure will reach or exceed that; throttle-only riding at higher speeds on soft ground will fall short of it. Fat tires make pressure a significant variable - running 10 psi on pavement instead of 18 psi can cost several miles. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent, which returns as the pack warms.
Tip: Charge only with the supplied 52 V charger. A 48 V charger will not bring a 52 V pack to full charge, and using a mismatched supply is the fastest way to damage a battery management system.
A full charge from empty takes approximately 7-9 hours. If the bike will sit unused for more than a month, store the pack at 30-70 percent charge and top it up every 4-6 weeks - lithium cells age fastest when held at either extreme of their charge window.
Daily Use & Care
- Set tire pressure for the surface: 15-20 psi on pavement for lower rolling resistance, 10-12 psi on mud, sand, gravel, or snow for grip.
- Rinse the frame, rims, and drivetrain after muddy or salted rides, but never aim a pressure washer at the hub motor, the controller, or the battery connectors.
- Check axle nuts and stem bolts weekly. Hub-motor torque works fasteners loose faster than pedalling alone does.
- Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or heavy dust.
- Inspect brake pad thickness monthly. Hydraulic pads wear silently until they are gone; replace when the friction material is under 1 mm.
- Use only the supplied 52 V charger, indoors at room temperature, and unplug once the indicator turns green.
- Wipe the fork stanchions clean after dusty or wet rides so grit is not dragged past the seals on the next compression.
What's in the Box
- 1 x HKM-8267475 electric mountain bike, approximately 85 percent pre-assembled
- 1 x 52 V 22.4 Ah lithium battery pack
- 1 x 52 V 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 Portable tire pump
- 1 x User manual and assembly guide
Frequently Asked Questions
How much assembly is required out of the box?+
The bike ships approximately 85 percent assembled. You fit the front wheel, align and bolt the handlebar, install the pedals and saddle, and check brake alignment and rotor clearance. Budget 30-45 minutes with the supplied tools, and have a bike shop verify torque and derailleur indexing if you are not comfortable doing it yourself.
What is the advantage of a 52 V system over 48 V?+
For the same power output, a higher voltage system draws less current. Less current means less heat generated in the cables, connectors, and motor windings, and less voltage sag when the motor is loaded. In practice the bike holds its performance better on long climbs and feels more consistent as the pack discharges.
Can I charge it with a standard 48 V charger?+
No. A 52 V pack requires a 52 V charger; a 48 V unit will not bring it to full charge and mismatching chargers risks damaging the battery management system. Use only the charger supplied with the bike or a correctly specified 52 V replacement.
What range should I plan for?+
The quoted figure is over 60 km (37+ mi). Moderate pedal-assist on mixed surfaces at correct tire pressure reaches or exceeds it; throttle-only riding at higher speed on soft ground falls short. Rider weight, headwinds, hills, and cold weather all reduce range.
Are 26 x 4.0 in fat tires slower on pavement?+
Slightly. A wide casing has more rolling resistance than a narrow one, and running it soft makes the difference larger. Inflate to 18-20 psi for road riding and most of the penalty disappears; drop the pressure again when you leave the tarmac and you get the grip back.
Can I pedal it if the battery runs out?+
Yes. The 7-speed derailleur drivetrain works independently of the motor. At approximately 73 lb the bike is heavy for unassisted pedalling, so it is slow going, but it is entirely rideable on level ground.
Is a license or registration required?+
Rules vary by state and locality. A 2000 W motor exceeds the limits of the common three-class e-bike framework in most US jurisdictions, which may place this vehicle in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or bike paths.
Is the colour LCD readable in sunlight?+
Yes - the display is backlit and sized so that speed and charge remain legible in direct daylight. It shows speed, battery level, assist mode, trip distance, and odometer, and the backlight can be adjusted for night riding.
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CERoHSUN38.3 Battery1165 Wh PackHydraulic Brakes52 V SystemColour LCD
Why Choose the HKM-8267475
52 Volts Is a Real Engineering Choice
Running 52 V instead of 48 V is not a marketing number. Lower current for the same power means cooler cables, cooler windings, and less voltage sag under load. It is the kind of specification that shows up as consistency on a long climb rather than as a bigger figure on the spec sheet.
Full-Size Wheels with Fat-Tire Flotation
26 x 4.0 in is a combination that works on both sides of the kerb: the 26 in rim rolls over obstacles a smaller wheel would stop on, while the 4 in casing floats over mud, sand, and snow. One bike covers the commute and the weekend trail without changing anything but tire pressure.
Torque from Zero, No Downshift Required
A hub motor applies its full torque the instant you open the throttle, with no gear selection and no clutch. Restarting on a loose climb, pulling away from a junction with a loaded pack - these are the moments where an electric drive is simply better than a mechanical one.
Simple Drive Path, Little to Maintain
No mid-drive gearbox, no secondary chain, no belt. The motor is part of the wheel, which means fewer wear items, less to adjust, and a ride quiet enough that you can hear traffic around you.
Aluminum Alloy Keeps the Weight Honest
Carrying a 1165 Wh pack and a 2000 W hub motor adds up quickly. An aluminum alloy frame keeps the total at approximately 73 lb, which is the difference between a bike you can lift onto a rack and one you have to wheel everywhere.
Specified for Mixed Weather Riding
Sealed connectors, hydraulic brake lines that cannot corrode in road film, and disc brakes that keep working with muddy wheels are the details that decide whether a bike gets ridden all year or only in good weather.
Controls & Indicators
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons on the display cycle through the pedal-assist levels plus zero assist
Twist Throttle
Right-hand grip; proportional response, works independently of pedal-assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Segmented charge indicator plus voltage readout on the colour LCD
Light Switch
Long-press the up button to toggle the LED headlight and display backlight
Shifter
Right-hand index shifter for the 7-speed rear derailleur
Pre-Ride Safety Checklist
- Check tire pressure and set it for the surface: 15-20 psi for pavement, 10-12 psi for mud, sand, gravel, or snow.
- Squeeze both brake levers. They should firm up well before reaching the grip, with no sponginess that would indicate air in the hydraulic line.
- Confirm the battery is seated and locked and that the colour display shows the state of charge you expect.
- Spin both wheels and check that the rims run true and nothing rubs the brake pads or the frame.
- Verify axle nuts and stem bolts are tight, and that the headset has no play when you rock the bike with the front brake applied.
- Shift through all seven gears on the stand to confirm the derailleur indexes cleanly before you need it on a climb.
- Test the throttle at walking pace in a clear area before riding in traffic, especially after transport or maintenance.
- Switch on the headlight if riding near dusk, and wear a helmet rated for the speeds this bike reaches.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the display is on and shows charge, the battery is locked into place, and both brake levers are fully released - the cut-off sensors disable drive while a lever is pulled. If the display shows an error code, note it and contact support.
The pack will not charge to full.+
Check that you are using the 52 V charger supplied with the bike. A 48 V charger cannot bring a 52 V pack to full charge and the display will show a permanently reduced state of charge. If the correct charger is in use and the pack still will not fill, contact support.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system means air in the line or a fluid leak. Stop riding and have the system bled and inspected rather than continuing on compromised brakes.
The chain skips under hard pedalling.+
The derailleur indexing is likely out of adjustment, or the chain and cassette are worn. Turn the barrel adjuster a quarter turn at a time to realign the indexing. If it skips only in the smallest cogs, replace the chain and cassette together.
The bike feels vague or squirms on pavement.+
Fat tires run at low pressure will squirm on tarmac. Raise the pressure to 18-20 psi for road riding. If the vagueness persists, check the headset for play and confirm both axles are properly seated and torqued.
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 the conditions that produced it, then contact support - codes map to specific faults in the controller, motor, or throttle circuits.
Certifications & Standards
The HKM-8267475 is produced in a facility operating under an ISO 9001 quality management system. The 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 - 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 2000 W electric bicycle on a 52 V system, capable of speeds well above normal cycling pace. Read the manual fully before the first ride and practise throttle and brake control in an open, traffic-free area until the response feels predictable - particularly if you are coming from an unpowered bicycle.
- Wear a helmet on every ride. A certified bicycle helmet is the minimum at these speeds; gloves and eye protection are sensible additions.
- 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 paths. A 2000 W motor may place this vehicle outside standard e-bike classifications in your area.
- Charge only with the supplied 52 V charger. A mismatched charger can damage the battery management system and create a fire risk.
- Bed in the brake pads with 10-15 progressive stops during the first few rides before riding at full speed.
- Do not ride through water deep enough to reach the hub motor or the battery mount, and do not pressure-wash the electrical components.
- Do not attempt to open, puncture, or modify the battery pack. Damaged lithium cells can vent and ignite.
- Reduce speed substantially on wet surfaces, loose gravel, and downhill grades. Fat tires add grip but do not eliminate the risk of losing traction.
HKM-8267475 · 2000 W dual-drive brushless rear hub motor · 52 V 22.4 Ah lithium (1165 Wh) · approximately 31 mph top speed · 37+ mi range · 26 x 4.0 in fat tires · 330 lb (150 kg) load capacity · aluminum alloy frame · front suspension fork · hydraulic disc brakes · 7-speed derailleur · colour LCD display. 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 mixed surfaces. 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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