Compact Dual-Suspension Electric Mountain Fat Tire Bike
HKM-7808723 Electric Mountain Fat Tire Bike
The HKM-7808723 puts a 3000 W brushless direct-drive hub motor into a short-wheelbase carbon steel chassis riding on 14 x 3 in fat tires. The small wheel diameter spins up quickly and keeps the centre of gravity low, while the wide casings float over sand, mud, and loose gravel that would trap a narrow tyre. A telescopic front fork and a rear shock damp both axles independently, hydraulic disc brakes handle the descents, and a single-speed drivetrain removes derailleurs, shift cables, and chain drops from the maintenance list. At 61.8 in long it fits in a pickup bed or a garage corner without a rack.
3000 W Brushless Hub MotorDual Front and Rear Suspension14 x 3 in Fat TiresHydraulic Disc BrakesCarbon Steel FrameSingle-Speed Drivetrain265 lb Load Capacity125.7 lb Bike Weight
Motor
3000 W
Brushless direct-drive rear hub
Battery
Lithium-Ion
Amp-hour rating marked on the pack
Drivetrain
Single Speed
No derailleur, no shift points
Range
Terrain-Dependent
Varies with load, gradient, and throttle use
Tires
14 x 3 in
Fat tread on 14 in alloy rims
Load Capacity
265 lb
120 kg rider plus gear
Overview
The HKM-7808723 is a compact trail machine rather than a scaled-down bicycle. The frame is welded from carbon steel at the head tube junction, the bottom bracket shell, and the dropouts, which are the three areas that take the highest loads when a small-wheeled bike lands off a kerb or a rock ledge. Steel also damps high-frequency vibration better than aluminium, so washboard fire roads feel planted instead of buzzy. The finished frame is powder coated for corrosion resistance in wet and salted conditions.
Drive comes from a 3000 W brushless DC motor built directly into the rear wheel. There is no chain tension to set between the motor and the ground, no belt to replace, and no gearbox to service, so the drive path stays quiet and largely maintenance free. Electric motors make their peak twisting force from zero rpm, which is why the bike pulls away from a standstill on a loose incline without the clutch feathering a combustion machine would need.
Both axles are sprung. The telescopic front fork and the rear shock offer roughly 80 to 120 mm of travel each, tuned to resist bottoming out on drop-offs while staying supple enough to track small bumps. The 3 in wide tyres act as a third spring: run them soft and the casing deforms around roots and stones before the suspension is asked to do anything. On pavement the same tyres soak up expansion joints and pothole edges that jar a conventional commuter.
Practical numbers frame the rest of the package. Load capacity is 265 lb (120 kg), enough for a geared adult rider plus a packed frame bag for an overnight trip. The bike itself weighs 125.7 lb (57 kg) and measures 61.8 x 30.7 x 40.6 in (157 x 78 x 103 cm), so two people can lift it into a truck bed and it stands in a garage without a dedicated rack. Unisex geometry and an upright riding position suit a wide spread of rider heights.
Key Features
3000 W Brushless Direct-Drive Hub Motor
The 3000 W motor is laced into the rear wheel, so electromagnetic torque reaches the ground without passing through a gearbox or a secondary chain. Drive losses stay low, the powerband is continuous from a standstill to cruising speed, and there is nothing in the drive path to adjust. Sealed housings keep dust, mud, and splash water out of the stator.
Removable Lithium-Ion Pack and Charging Practice
The bike runs on a lithium-ion pack with a battery management circuit that watches cell voltage and temperature during both charge and discharge. The amp-hour rating is printed on the pack label; multiply it by pack voltage to get watt-hours, then budget roughly 20 to 30 Wh per mile at trail speeds to estimate the distance you can plan for. Charge indoors at room temperature with the supplied charger.
Dual Suspension: Telescopic Fork Plus Rear Shock
Front and rear units are damped independently, so one wheel can absorb an impact without unsettling the other. Travel of roughly 80 to 120 mm per axle keeps the tyres in contact with rutted ground, which is what actually produces grip on a descent. Spring rate and damping are set for mixed trail use rather than for a single discipline.
Hydraulic Disc Brakes with Ventilated Rotors
Lever pressure travels through sealed fluid lines to caliper pistons that clamp the rotors, so the system self-adjusts as pads wear and lever feel stays consistent as the rotors heat up. Ventilated rotors shed heat on long descents. Because the lines are sealed, road film and trail grime cannot corrode a cable the way they do on mechanical brakes.
Single-Speed Drivetrain, Deliberately Simple
The wide, flat torque curve of the hub motor makes a multi-speed cassette unnecessary for most riding. Removing it also removes derailleur adjustment, shift cable stretch, and the chain drops that plague geared bikes on rough ground. The controller modulates output smoothly from walking pace upward, working much like a continuously variable drive.
14 x 3 in Fat Tires on Alloy Rims
A 3 in casing on a 14 in aluminium rim produces a broad contact patch for the wheel size, which is what gives the bike traction on sand, snow, mud, and hardpack. The small diameter has low rotational inertia, so the bike accelerates briskly and changes direction quickly in tight singletrack. Lower inflation pressure increases both flotation and comfort.
Upright Riding Position and Sightlines
The frame geometry places the rider upright rather than stretched over the bar. On a trail that means a clear view of the line ahead and easy weight shifts behind the saddle; in traffic it means you sit high enough to see over parked cars and to be seen by drivers. It also reduces wrist and lower-back fatigue on rides that run over an hour.
265 lb Payload for Rider and Gear
The 265 lb (120 kg) rating covers the rider, clothing, and anything strapped to the bike. That headroom is what makes overnight trips realistic: a fully geared adult can still add a frame bag, water, tools, and a compact shelter without exceeding the structural limit the frame and suspension were tested to.
Full Specifications
Model
HKM-7808723 | Electric Mountain Fat Tire Bike
Frame Material
Carbon steel, jig-welded and powder coated, unisex geometry
Motor
3000 W brushless DC rear hub motor
Drive Layout
Direct drive: no chain, belt, or gearbox between motor and wheel
Battery
Lithium-ion pack with battery management; amp-hour rating marked on the pack label
Charger
Smart charger supplied with the bike, 100-240 V input
Charging Time
Scales with pack capacity; an overnight charge covers a fully depleted pack
Battery Management
Monitors cell voltage, temperature, and charge balance on every cycle
Speed Control
Twist throttle metered by the electronic controller, progressive delivery
Range Per Charge
Varies with pack capacity, rider weight, gradient, tyre pressure, and throttle use
Climbing
Direct-drive torque suited to steep gradients and loose surfaces
Torque Delivery
Peak torque available from zero rpm, no rev build-up required
Drivetrain
Single speed; no derailleur, shift cables, or chain drops
Brakes
Hydraulic disc, front and rear, ventilated rotors
Suspension
Dual: telescopic front fork plus rear shock, approximately 80-120 mm travel per axle
Tires
14 x 3 in fat tires, knobby all-terrain tread
Wheels
14 in aluminium alloy rims
Riding Position
Upright unisex geometry with a wide riser handlebar
Cockpit
Twist throttle on the right grip, hydraulic brake levers on both sides
Throttle
Twist-grip throttle with progressive, lag-free response
Weather Capability
Sealed motor unit and hydraulic brakes for rain, mud, and light snow
Load Capacity
265 lb (120 kg) rider plus gear
Bike Weight
125.7 lb (57 kg)
Dimensions (L x W x H)
61.8 x 30.7 x 40.6 in (157 x 78 x 103 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The HKM-7808723 runs a lithium-ion pack governed by a battery management circuit. Rather than quote a single range figure that would only apply to one rider on one surface, it is more useful to work from energy: read the amp-hour rating printed on your pack, multiply by pack voltage to get watt-hours, and divide by an energy-use figure of roughly 20 to 30 Wh per mile for mixed trail riding. Steady cruising on hardpack sits at the low end of that band; deep sand, mud, and repeated climbs sit at the high end.
Four variables move real-world range more than anything else: rider and gear weight, gradient, tyre pressure, and how much time you spend at wide-open throttle. Soft tyres cost energy on pavement and gain it back in grip off road, so set pressure for the surface you will actually ride. Ambient temperature matters too: below about 40 F (4 C) a lithium pack temporarily gives up 10 to 20 percent of its usable capacity and recovers it once warm.
Tip: If the bike will sit unused for more than a month, store the pack around half charge, indoors, and top it up every four to six weeks. Charging at room temperature rather than in an unheated garage measurably extends the service life of lithium cells.
Charge with the supplied unit on a hard, non-flammable surface and unplug once charging completes rather than leaving the pack connected for days at a time. Keep the charge port cover closed while riding so trail dust and splash water stay out of the contacts.
Daily Use & Care
- Set tyre pressure for the surface: firmer for pavement and hardpack to lower rolling resistance, softer for sand, mud, and snow so the casing can spread and grip.
- Rinse the frame, rims, and rotors with fresh water after riding in mud or on salted winter roads, then dry the rotors with a few gentle stops.
- Check the axle nuts and the stem and bar bolts before the first ride of each week. Hub-motor torque loosens fasteners faster than pedalling alone ever does.
- Inspect the chain for tension and lubricate it after wet or dusty rides; a single-speed chain still stretches and still needs oil.
- Measure brake pad thickness monthly and replace pads once the friction material is under about 1 mm (0.04 in).
- Have the hydraulic brake system bled every 12 to 18 months, or sooner if the lever feel turns soft, using the fluid type specified for the calipers.
- Wipe the fork stanchions clean after every dusty ride so grit is not dragged past the seals on the next compression stroke.
What's in the Box
- 1 x HKM-7808723 electric mountain fat tire bike, largely pre-assembled
- 1 x Lithium-ion battery pack
- 1 x Smart charger with 100-240 V input
- 2 x Keys
- 1 x Toolkit with hex wrenches and a spanner
- 1 x Pair of pedals
- 1 x User manual and assembly guide
- 1 x Warranty and support card
Frequently Asked Questions
What terrain is the HKM-7808723 designed for?+
It is built for mixed-terrain use: mountain trails, forest paths, gravel roads, and city streets. The fat tyres and dual suspension are particularly effective on loose or uneven ground such as sand, mud, light snow, and rocky singletrack, while the 3000 W motor supplies the torque for steep pitches and the hydraulic discs handle the way back down.
Why a single-speed drivetrain on an electric bike?+
Because the hub motor already delivers broad, consistent torque across its speed range, mechanical gears add little for most riding. Removing them removes derailleur adjustment, shift cable stretch, and chain drops on rough ground. The controller varies power output smoothly from a standstill to cruising speed, which in practice behaves like a continuously variable transmission.
What range should I plan for?+
Range depends on the pack capacity fitted, rider and gear weight, gradient, surface, tyre pressure, ambient temperature, and throttle discipline. Work it out from energy: watt-hours divided by roughly 20 to 30 Wh per mile for mixed trail riding. Steady cruising on flat hardpack returns considerably more distance than sustained throttle-only climbing in sand.
Does a 3000 W motor comply with local e-bike rules?+
Regulations differ by country, state, and municipality. In many places 3000 W exceeds the power ceiling for road-legal Class 1, 2, or 3 e-bikes, which is why this machine is intended primarily for off-road and private-land use. Check local law on power limits, helmet requirements, and trail access before riding on public roads or shared-use paths.
How do I maintain the hydraulic disc brakes?+
They are largely self-adjusting. Inspect the pads periodically and replace them once the friction material is thinner than about 1 mm (0.04 in), check the rotors for warping or scoring, and look for any sign of fluid weeping at the lines or calipers. Bleeding the system every 12 to 18 months keeps lever feel firm.
What is the advantage of 14 in wheels with 3 in tires?+
A small wheel has low rotational inertia, so it accelerates quickly and changes line easily, and it keeps the centre of gravity low for stability. The 3 in casing compensates for the small diameter by enlarging the contact patch, which restores traction and flotation on soft ground. The combination suits technical riding where grip and agility matter more than outright rollover.
How much assembly is needed on arrival?+
The bike arrives largely built. Typical remaining steps are fitting the pedals, aligning and bolting the handlebar, setting saddle height, checking brake alignment and rotor clearance, and inflating the tyres. Budget 30 to 45 minutes with the supplied tools, and have a shop verify fastener torque if you are not confident doing it yourself.
How heavy is it and can one person move it?+
The bike weighs 125.7 lb (57 kg), which is substantial for its compact 61.8 in length. One person can roll and manoeuvre it easily, but use two people or a ramp to lift it into a vehicle. Removing the battery pack first lowers the lifted weight and keeps the pack from taking a knock.
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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 Battery3000 W MotorHydraulic BrakesDual SuspensionCarbon Steel Frame
Why Choose the HKM-7808723
Small Wheels, Serious Capability
A 14 in wheel wrapped in a 3 in tyre is an unusual combination that trades rollover for agility and flotation. On tight trails, in sand, and in a crowded garage that trade works in your favour: quicker direction changes, a lower centre of gravity, and a bike short enough to store where a full-size mountain bike will not fit.
Built Around Off-Road Loads
Steel frame, jig-welded stress nodes, dual suspension, and hydraulic brakes are the specification you would choose if the bike had to survive rocky descents and repeated hard landings rather than a smooth bike path. Every one of those choices costs weight, which is exactly why the bike weighs 125.7 lb.
Nothing to Shift, Nothing to Feather
Twist and go. There is no clutch, no gear selection, and no power band to keep the motor inside. That removes the two skills that most often stall a newer rider on a technical climb and lets you concentrate on line choice and body position instead.
Near-Silent Direct Drive
With one rotating part in the motor and no gearbox, the drivetrain is quiet enough to hear the tyres and the wind. That opens up trails near homes and noise-sensitive land where a combustion machine would be unwelcome, and it makes group riding far more pleasant.
Zero Tailpipe Emissions
No fuel, no oil changes, no spark plugs, no exhaust. Beyond the emission saving, that removes the spill risk that comes with carrying and decanting petrol on public land, and it cuts running costs to electricity, tyres, pads, and chain lube.
Finished for Wet and Salted Conditions
The powder-coated steel frame, sealed motor housing, and closed hydraulic circuit are all chosen with weather in mind. Rain, puddles, and light snow are part of normal use rather than an exception, provided the bike is rinsed and dried afterwards.
Controls & Indicators
Power Switch
Switches the controller and drive system on; leave it off while the bike is parked or loaded for transport
Handlebar Layout
Wide riser bar with the throttle on the right grip and both brake levers inside a two-finger reach
Twist Throttle
Progressive twist-grip throttle; power builds from a standstill with no shift points to interrupt it
Front Brake Lever
Left lever drives the front hydraulic caliper; apply it progressively on loose or wet surfaces
Charge Port
Sealed port for the supplied charger; keep the cover closed when riding through water or dust
Rear Brake Lever
Right lever drives the rear caliper and does most of the work on long descents
Rear Shock Preload
Set preload to suit rider weight - firmer for heavier riders or gear-loaded rides, softer for comfort
Pre-Ride Safety Checklist
- Check tyre pressure and set it for the surface you plan to ride; a soft front tyre on pavement makes the steering vague at speed.
- Squeeze both brake levers. They should firm up well before the grip, with no sponginess that would suggest air in the hydraulic line.
- Confirm the battery pack is seated and locked and that the drive system powers up as expected.
- Spin both wheels and check that the rims run true and that neither rotor rubs its pads.
- Verify the axle nuts, stem bolts, and bar clamp are tight, and rock the bike with the front brake applied to check for headset play.
- Cycle the suspension by compressing the fork and shock a few times; both should return smoothly without clunking.
- Test the throttle at walking pace in a clear, traffic-free area before committing to a trail or a road.
- Wear a helmet rated for the speeds you intend to ride, plus gloves and eye protection for off-road use.
Quick Troubleshooting
The motor does not respond when I twist the throttle.+
Confirm the system is switched on, the pack is seated and holding charge, and both brake levers are fully released, since brake cut-off sensors disable drive while a lever is pulled. Check the main connector between pack and controller is fully mated. If a fault indication appears, note it before contacting support.
Range has dropped noticeably compared with when it was new.+
Start with tyre pressure, which is the most common cause and the easiest to fix. Then account for temperature, since cold reduces available capacity temporarily. A pack that is down more than 30 percent year-round after many cycles is approaching the end of its service life.
The brakes feel soft at the lever.+
Sponginess in a hydraulic system normally means air in the line or a fluid leak. Stop riding, inspect the lines and calipers for weeping, and have the system bled with the specified fluid. Do not continue riding a heavy bike on compromised brakes.
The chain jumps or comes off on rough ground.+
Single-speed chains still need correct tension. Check that the rear wheel is square in the dropouts and that the axle nuts are torqued, then set tension so the chain deflects about 10 to 15 mm at the mid-point. Replace a chain that has stretched past its wear limit.
The front fork clunks over bumps.+
Confirm the wheel is fully seated in the dropouts and the axle is tight, then check the stanchions for scoring or oil weeping past the seals. Persistent noise after that usually means the lowers need servicing.
The bike loses power on long climbs.+
Sustained full-throttle climbing heats the motor and the pack, and the controller reduces output to protect them. Stop for a few minutes to let temperatures fall, then climb in shorter efforts. Lower tyre pressure on loose ground also reduces wheelspin, which wastes energy as heat.
Certifications & Standards
The HKM-7808723 is produced in a facility operating under an ISO 9001 quality management system. The cells and the assembled pack carry the 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 3000 W off-road machine, not a pedal-assist bicycle. Read the manual before the first ride and practise throttle control in an open, traffic-free area until the response feels predictable, particularly if you are coming from a conventional bicycle.
- Wear a helmet on every ride, along with gloves and eye protection off road; many riders add knee and elbow protection at trail speeds.
- Do not exceed the 265 lb (120 kg) load capacity, which includes the rider, clothing, and any gear carried on the bike.
- Check local law before riding on public roads or shared-use paths. A 3000 W motor exceeds the power ceiling for standard e-bike classes in many jurisdictions.
- Bed the brake pads in with 10 to 15 progressive stops from moderate speed during the first rides before riding at full pace.
- Do not ride through water deep enough to reach the hub motor or the battery compartment.
- 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 the battery pack; damaged lithium cells can vent and ignite.
- Reduce speed substantially on gravel, wet rock, and steep descents - fat tyres add grip but cannot repeal physics.
HKM-7808723 · 3000 W brushless direct-drive rear hub motor · lithium-ion pack with battery management · dual front and rear suspension, approximately 80-120 mm travel per axle · 14 x 3 in fat tires on 14 in alloy rims · hydraulic disc brakes front and rear · single-speed drivetrain · carbon steel frame · 265 lb (120 kg) load capacity · 125.7 lb (57 kg) bike weight · 61.8 x 30.7 x 40.6 in. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range depends on the battery capacity fitted and on riding conditions. 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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