Dual-Battery Off-Road Electric Dirt Bike
HKM-8726227 Off-Road Electric Dirt Bike
The HKM-8726227 is built around a 25 in carbon steel frame and a 2000 W variable-speed high-torque motor, and it rides on 70/100-19 knobby tires that measure roughly 25 in across the outside - dirt-bike rubber rather than bicycle rubber. Two quick-release 48 V 18.2 Ah lithium packs give a combined 36.4 Ah and about 1747 Wh, which is what makes a 155 mi (250 km) day on low pedal assist realistic. A hydraulic double-wishbone front end and a rear shock keep both wheels tracking over rutted ground, hydraulic disc brakes handle the descents, and a 5 in LED display puts speed, charge, and assist level directly in front of you.
2000 W High-Torque MotorDual 48 V 18.2 Ah Packs1747 Wh Combined CapacityUp to 155 mi Range70/100-19 Knobby TiresDouble-Wishbone Front EndHydraulic Disc Brakes25 in Carbon Steel Frame
Motor
2000 W
Variable-speed high-torque drive
Battery
48 V 36.4 Ah
1747 Wh across two packs
Top Speed
18.6 mph
30 km/h, governed
Range
Up to 155 mi
250 km on low pedal assist
Tires
70/100-19
Knobby off-road, 25 in outside diameter
Load Capacity
330 lb
150 kg rider plus gear, approximate
Overview
The HKM-8726227 sits at the dirt-bike end of the electric two-wheeler spectrum. The 25 in carbon steel frame is heavier than an aluminum bicycle chassis and deliberately so: steel absorbs vibration, tolerates repeated impact loading, and can be welded and repaired in the field if a hard landing ever calls for it. The geometry is long and low, with a proper motorcycle-style riding triangle rather than a bicycle one.
Drive comes from a 2000 W variable-speed high-torque motor. The governed top speed is a deliberately modest 18.6 mph (30 km/h), which tells you where the gearing has been placed - the whole power band is aimed at torque for climbing and slow-speed control on technical ground rather than at outright pace on tarmac. On a loose fire-road climb that trade is the right way round.
Energy storage is the standout number. Two 48 V 18.2 Ah lithium packs sit in the frame for a combined 36.4 Ah and roughly 1747 Wh, around three times what a conventional commuter e-bike carries. Both packs release quickly for indoor charging, and the bike will run on one pack alone if you want to leave the second on the charger. On low pedal assist the manufacturer figure reaches 155 mi (250 km); throttle-heavy off-road riding is realistically closer to 45-60 mi.
Suspension is where the dirt-bike intent shows most clearly. The front end uses a hydraulic double-wishbone layout rather than a telescopic bicycle fork, which keeps the wheel geometry more consistent through the stroke and resists the fore-aft flex a long single-crown fork suffers under braking. A rear shock completes the pairing, so both wheels stay in contact with the ground over washboard and root sections.
Key Features
2000 W Variable-Speed High-Torque Motor
The motor is geared for pulling rather than for top speed. Peak torque arrives from a standstill, which is exactly what you want when you are restarting on a loose uphill or picking your way through rocks at walking pace. Variable-speed control means power is metered progressively with the throttle instead of arriving all at once.
Dual 48 V 18.2 Ah Lithium Packs (1747 Wh)
Two independent packs give 36.4 Ah combined. Splitting the capacity in two keeps each pack light enough to carry indoors, allows you to charge one while riding on the other, and provides a fallback if a single pack is damaged or depleted. Both use a quick-disassemble mount, so swapping takes seconds rather than tools.
Hydraulic Double-Wishbone Front Suspension
A double-wishbone front end controls wheel movement with two linked arms and a hydraulic damper. Compared with a telescopic fork it holds the wheel geometry more consistently through the stroke and resists the flex a long fork develops under hard braking. The result is a front wheel that tracks predictably on rutted, off-camber ground.
Hydraulic Disc Brakes, Front and Rear
Sealed hydraulic lines actuate discs at both ends. Lever effort stays light and consistent as the rotors heat up on long descents, and there are no exposed cables to pack with mud or corrode. Progressive modulation matters more than outright bite on loose surfaces, and that is what this system delivers.
Five-Level Pedal Assist Plus Throttle
Five assist levels let you set how much the motor contributes, from a light hand for conserving battery on flat trail to full support on a sustained climb. A pure throttle mode bypasses pedal input completely for technical sections where your feet need to be free.
70/100-19 Knobby Off-Road Tires
These are motorcycle-sized tires, not bicycle tires: a 70 mm section width, a 100 percent aspect ratio, and a 19 in rim giving roughly a 25 in outside diameter. The tall sidewall provides its own cushioning over square-edged hits, and the deep, widely spaced knobs clear mud instead of packing with it.
LED Headlight with Wing-Shaped Ambient Lighting
A forward LED unit lights the trail, and a wing-shaped ambient light strip across the bodywork adds a distinctive lit signature that makes the bike far easier for other trail users and traffic to pick out at dawn and dusk. Both run from the main packs.
Quick-Disassemble Battery Mounting
Both packs drop out of the frame without tools. That turns charging into an indoor job, makes it easy to reduce the weight of the bike before lifting it into a truck bed, and means a spare pack can be stored charged and fitted in seconds at a trailhead.
Full Specifications
Model
HKM-8726227 | Off-Road Electric Dirt Bike
Frame Material
25 in high-carbon steel, off-road dirt-bike geometry
Motor
2000 W variable-speed high-torque motor
System Voltage
48 V DC
Battery
Dual 48 V 18.2 Ah lithium-ion, 36.4 Ah combined (approximately 1747 Wh)
Charger
Smart charger, 100-240 V input, charges either pack
Charging Time
Approximately 6-7 hours per pack from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
18.6 mph (30 km/h), governed
Range Per Charge
Up to 155 mi (250 km) on low pedal assist; approximately 45-60 mi throttle-heavy off-road
Climbing Grade
Up to approximately 30 degrees with a solo rider on firm ground
Torque Character
High-torque gearing, peak output available from standstill
Drivetrain
Chain drive with pedals, 5 pedal-assist levels plus throttle mode
Brakes
Hydraulic disc brakes front and rear with motor cut-off levers
Suspension
Hydraulic double-wishbone front suspension plus rear shock
Tires
70/100-19 knobby off-road tires, approximately 25 in outside diameter
Wheels
19 in off-road rims with spoked construction
Saddle
Long flat dirt-bike saddle allowing fore-aft weight shift
Display
5 in LED display: speed, battery level, assist level, trip distance, odometer
Throttle
Twist throttle with 5 pedal-assist levels and zero assist
Lighting
LED headlight, tail-light, and wing-shaped ambient light strip
Load Capacity
Approximately 330 lb (150 kg) rider plus gear
Bike Weight
Approximately 130 lb (59 kg) with both packs fitted
Recommended Rider Height
5 ft 4 in to 6 ft 4 in (163-193 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
Two 48 V 18.2 Ah packs give a combined 36.4 Ah, or roughly 1747 Wh. To put that in context, a typical commuter e-bike carries 400-600 Wh, so this bike stores around three times the energy. That capacity is what makes an all-day trail ride possible without planning the route around a charging stop, and it is also why the manufacturer range figure of 155 mi (250 km) on low pedal assist is achievable at the governed 18.6 mph.
Real-world range depends heavily on how you ride. Throttle-heavy off-road use with frequent climbs and restarts is realistically in the 45-60 mi band. Low assist on hardpack and fire road stretches well past 100 mi. Because the packs are independent, you can also treat the second one as a reserve: run pack one until it is empty, swap, and know exactly how much range you have left.
Tip: Both packs use a quick-disassemble mount and come out without tools. Charge them indoors at room temperature, and if the bike will be stored for more than a month, leave each pack near 50 percent charge and top up every 4-6 weeks.
The bike will run on a single pack, which is useful if you want to reduce weight for a short ride or if one pack is on charge. Charging both at once requires a second charger; with the single supplied unit, plan roughly 6-7 hours per pack from empty and charge them sequentially overnight.
Daily Use & Care
- Check tire pressure before every off-road ride. Tall-sidewall knobby tires lose pressure faster than bicycle tires and run correctly within the range printed on the sidewall.
- Wash mud out of the knobs and off the rotors after wet rides, then dry the bike; packed mud holds moisture against steel and accelerates corrosion.
- Inspect the frame welds and the wishbone pivot points after any hard landing or heavy impact, and re-torque the pivot bolts monthly.
- Clean and re-lubricate the chain every 100-150 mi, or immediately after riding through water, sand, or deep dust.
- Check hydraulic brake pad thickness monthly. Off-road grit wears pads considerably faster than road use does.
- Touch up paint chips on the steel frame promptly. Unlike aluminum, exposed steel will rust once the coating is broken.
- Charge both packs indoors at room temperature and unplug the charger once the indicator turns green.
What's in the Box
- 1 x HKM-8726227 off-road electric dirt bike, partially pre-assembled
- 2 x 48 V 18.2 Ah quick-release lithium battery packs
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Assembly toolkit with hex wrenches and spanners
- 1 x Pair of platform pedals
- 1 x Spare fuse and connector set
- 1 x User manual and assembly guide
Frequently Asked Questions
Why is the top speed only 18.6 mph when the motor is 2000 W?+
Because the gearing is chosen for torque, not for pace. A 2000 W motor can be geared for a high top speed or for pulling power at low speed, and this bike is set up for the latter. On loose climbs, technical trail, and slow-speed manoeuvring that is the more useful of the two trades. The governed limit also keeps the bike within the speed thresholds used by some jurisdictions.
Is 155 mi of range realistic?+
That figure is measured on low pedal assist at moderate speed on reasonable surfaces, and with 1747 Wh on board it is achievable under those conditions. Off-road riding with frequent climbs and heavy throttle use is realistically 45-60 mi. Treat 155 mi as the upper bound rather than the everyday number.
Can I ride it with only one battery fitted?+
Yes. The bike operates normally on a single pack with roughly half the range. Many owners ride on one pack for short local rides to keep the weight down and fit both for longer days.
What is a double-wishbone front end and why does it matter?+
Instead of a telescopic fork that slides within itself, the wheel is located by two arms working against a hydraulic damper. The geometry stays more consistent as the suspension moves and the assembly resists the fore-aft flex a long fork develops under braking, so the front wheel tracks more predictably on rough, off-camber ground.
What tire size is 70/100-19 in plain terms?+
A 70 mm section width, a sidewall height equal to 100 percent of that width, mounted on a 19 in rim - giving roughly 25 in outside diameter. This is a small dirt-bike tire size rather than a bicycle size, so replacements come from motorcycle suppliers, not bike shops.
How long does charging take?+
Approximately 6-7 hours per pack from empty with the supplied charger. With one charger you charge the packs one after the other; adding a second charger lets you do both overnight in the same window.
Does it need a license or registration?+
That depends on your jurisdiction. The 18.6 mph governed speed keeps it below some thresholds, but a 2000 W motor exceeds the wattage limits used in many three-class e-bike frameworks, and dirt-bike tires may restrict where you can legally ride. Check state and local rules, and confirm trail access before riding on public land.
How much assembly is needed?+
The bike arrives partially assembled. Expect to fit the handlebars, front wheel, and pedals, then check brake function, chain tension, and suspension pivot torque. Given the weight and the suspension design, having a shop confirm the final setup before the first hard ride is sensible.
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CERoHSUN38.3 Battery1747 Wh Dual PackDouble-Wishbone FrontHydraulic Disc BrakesSteel Frame
Why Choose the HKM-8726227
Capacity That Changes How You Plan
At roughly 1747 Wh across two packs, this bike carries about three times the energy of a standard commuter e-bike. That removes the planning overhead from long rides: you stop thinking about where to charge and start thinking about where to go.
Genuine Dirt-Bike Hardware
Motorcycle-sized 70/100-19 knobby tires, a double-wishbone front end, a rear shock, and a steel frame are the components you would specify for off-road use if you were building the bike yourself. Nothing here is a bicycle part asked to do a dirt-bike job.
Torque Where It Is Useful
Gearing the 2000 W motor for pulling rather than for top speed means full output is available from a standstill. Restarting on a loose uphill, easing over a ledge, or holding a steady pace through deep sand all get easier when peak torque is available at walking speed.
Steel Frame, Damped Ride
Carbon steel absorbs high-frequency vibration that an aluminum frame transmits straight to the rider. Over a long day on washboard and gravel the difference in fatigue is noticeable, and steel tolerates repeated impact loading well.
Swap Packs, Not Plans
Both packs release without tools. Carry a charged spare, swap it at the trailhead in under a minute, and keep riding. Modular capacity is more flexible in practice than a single large fixed pack of the same total size.
Built for Mud and Weather
Sealed hydraulic brake lines cannot corrode the way exposed cables do, widely spaced tire knobs shed mud rather than packing with it, and the electrical connectors are sealed. Wet and muddy conditions are normal operating territory rather than an exception.
Controls & Indicators
Power Button
Switches the system on and off; hold to wake the 5 in LED display
Mode Buttons
Cycle through 5 pedal-assist levels plus zero assist
Twist Throttle
Right-hand grip; proportional response, works independently of assist level
Speedometer
Live speed on the 5 in LED display, switchable between mph and km/h
Battery Gauge
Shows combined charge across both packs, with per-pack state available
Light Switch
Toggles the LED headlight, tail-light, and ambient light strip
Suspension Preload
Adjust front wishbone damper and rear shock preload for rider weight and terrain
Pre-Ride Safety Checklist
- Check tire pressure against the figure printed on the sidewall; tall knobby tires lose pressure faster than bicycle tires.
- Squeeze both brake levers. They should firm up well before the grip with no sponginess that would indicate air in the hydraulic line.
- Confirm both battery packs are seated and latched, and that the display shows the state of charge you expect.
- Check the wishbone pivot bolts and the rear shock mounts for tightness, especially after any hard landing.
- Spin both wheels and check that the rims run true and that nothing rubs the pads or the frame.
- Set suspension preload for your weight and the terrain you plan to ride before you leave, not halfway up the trail.
- Switch on the headlight and ambient lighting for low-light riding, and wear a helmet and off-road protective gear appropriate to the terrain.
- Test the throttle at walking pace in a clear area and confirm that pulling either brake lever cuts motor drive.
Quick Troubleshooting
The motor does not respond to the throttle.+
Confirm the display is on and showing charge, that at least one pack is seated and latched, and that both brake levers are fully released - the cut-off switches disable drive while a lever is pulled. If an error code appears on the display, note it before contacting support.
One battery pack drains much faster than the other.+
Some imbalance between packs is normal as they age at slightly different rates. A large and growing difference suggests one pack has a weak cell group. Charge each pack individually to full, note the range each delivers on its own, and contact support with those figures.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system indicates air in the line or a fluid leak. Stop riding and have the system bled and inspected before the next descent. Do not continue on compromised brakes on off-road terrain.
The front end knocks or feels loose over bumps.+
Check the wishbone pivot bolts and the damper mounting hardware for torque first, since these work loose faster on a steel frame under repeated impact than most riders expect. If everything is tight and the knock persists, the pivot bushings may need replacement.
The chain comes off on rough descents.+
Chain tension is likely too loose, or the rear wheel has shifted in the dropouts. Reset the tension and check that the wheel is square in the frame. On a bike with this much torque, tension should be checked every few rides rather than every few months.
The display shows an error code and the bike will not move.+
Power the system off, wait 30 seconds, and restart. 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, throttle, or battery circuits.
Certifications & Standards
The HKM-8726227 is produced in a facility operating under an ISO 9001 quality management system. Both battery packs carry the test documentation normally required for lithium-ion transport and sale, and the assembled electrical system is certified for the European market.
- 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 an off-road machine with dirt-bike tires and dirt-bike suspension. Read the manual fully before the first ride, and build up to technical terrain gradually - the torque available from a standstill can lift the front wheel more easily than riders expect. Off-road protective gear is appropriate here, not optional extra.
- Wear a helmet on every ride. For off-road use, a full-face helmet with goggles, gloves, knee and elbow protection is the sensible minimum.
- Do not exceed the approximate 330 lb (150 kg) load capacity, which includes the rider and all carried gear.
- Check local law and land access rules before riding. A 2000 W motor and knobby off-road tires may exclude this vehicle from bike paths and from standard e-bike classifications in your area.
- Bed the brake pads in with 10-15 progressive stops during the first few rides before attempting a long or steep descent.
- Inspect the frame, welds, and suspension pivots after any hard landing or crash before riding again.
- Do not ride through water deep enough to reach the motor, the controller, or the battery compartments.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface, and do not leave a charging pack unattended overnight.
- Do not open, puncture, or modify either battery pack. Damaged lithium cells can vent and ignite.
HKM-8726227 · 2000 W variable-speed high-torque motor · dual 48 V 18.2 Ah lithium packs (36.4 Ah, approximately 1747 Wh) · 18.6 mph (30 km/h) governed top speed · up to 155 mi (250 km) on low pedal assist · 70/100-19 knobby off-road tires · hydraulic double-wishbone front suspension with rear shock · hydraulic disc brakes front and rear · 5 in LED display · 25 in carbon steel frame. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under low pedal assist on level ground. Weight and load figures are approximate. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations and land access rules before riding.
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