Moped-Style Fat Tire Electric Off-Road Bike
HKM-693459 Electric Off-Road Bike
The HKM-693459 puts a brushless rear hub motor rated at 1000 W continuous and 2000 W peak into a moped-style step-through chassis riding on 20 x 4.0 in fat tires. A removable 48 V 20 Ah lithium pack built from 21700 cells carries 960 Wh, enough for roughly 35-50 mi depending on how much you pedal. An 80 mm hydraulic fork with preload adjustment and a lockout lever takes the edge off broken ground, four-piston hydraulic calipers on 180 mm rotors bring the 37 mph top speed back under control, and IP65-rated electrics, full fenders, and a rear cargo rack mean the same bike handles a Saturday trail loop and a Monday grocery run without changing anything.
2000 W Peak Rear Hub Motor48 V 20 Ah / 960 Wh Pack37 mph Top Speed20 x 4.0 in Fat Tires4-Piston Hydraulic Brakes80 mm Suspension ForkIP65 Weather Sealing330 lb Load Capacity
Motor
2000 W Peak
1000 W rated brushless rear hub
Battery
48 V 20 Ah
960 Wh removable 21700 lithium
Top Speed
37 mph
60 km/h, throttle only
Range
35-50 mi
56-80 km, varies with assist
Tires
20 x 4.0 in
Fat knobby, sand snow gravel
Load Capacity
330 lb
150 kg rider plus cargo
Overview
The HKM-693459 borrows its silhouette from a small-displacement moped: a long, low step-through chassis, a bench-style saddle, wide handlebars, and full-length fenders over both wheels. The practical result is that you swing nothing over a high top tube. With a 28.7 in standover height and a 72.8 in overall length, riders between 5 ft 3 in and 6 ft 4 in can flat-foot the ground at a stop while still having room to stretch out on a longer ride.
Power comes from a brushless rear hub motor rated at 1000 W continuously with 2000 W available in short bursts for hills and standing starts. A sine-wave controller manages the current, which keeps the motor quiet under load and reduces the energy wasted as heat. On flat pavement in throttle-only mode the bike reaches a governed 37 mph (60 km/h); that limit can be lowered in the display settings where local rules require it.
Range spans 35-50 mi (56-80 km) from the 48 V 20 Ah pack. Throttle-only riding at higher speeds sits at the 35-40 mi end. Riding on assist levels 1-2 with real pedal input regularly pushes past 50 mi. Because the pack unlocks and lifts out of the frame in seconds, a second battery can be carried in the rear rack bag and swapped mid-ride for genuinely long days.
Suspension duty is split between an 80 mm hydraulic fork and the tires themselves. The fork has preload adjustment so you can set sag for your weight and a lockout lever for smooth tarmac. The rear triangle is rigid, which saves weight and removes a pivot to service; at 5-15 psi the 4 in casings flatten under load and absorb most of the small chatter that a rear shock would otherwise handle.
Key Features
2000 W Peak Brushless Rear Hub Motor
The motor is laced directly into the rear wheel, so there is no chain or belt carrying drive torque and nothing extra to service. Rated output is 1000 W with 2000 W available on demand, which is what pulls the bike up loose climbs and away from a standing start on gravel. A sine-wave controller smooths the current waveform, so the motor stays quiet rather than whining under sustained load.
48 V 20 Ah Removable Lithium Pack (960 Wh)
The pack sits centrally in the frame for balanced weight distribution and locks in place with a key. It is built from automotive-grade 21700 cells and monitored by a BMS covering overcharge, over-discharge, short circuit, and temperature limits. A 3 A smart charger refills it from empty in roughly 6-8 hours, on or off the bike. An LED gauge on the pack itself shows remaining capacity without powering up the display.
80 mm Hydraulic Fork with Preload and Lockout
The front fork offers 80 mm (3.15 in) of travel with a preload collar to match spring rate to rider weight and a lockout lever for efficient pedalling on smooth pavement. Coil and oil-damped internals are sealed against dust and water, so maintenance is limited to wiping the stanchions after dirty rides.
4-Piston Hydraulic Disc Brakes, 180 mm Rotors
Four-piston calipers on 180 mm rotors front and rear are a genuine step above the two-piston hardware usually fitted at this weight. Modulation stays progressive on long descents and lever effort remains low when the rotors heat up. Motor cut-off switches in both levers kill drive the instant either brake is touched.
Five Assist Levels, Throttle, and Walk Mode
Five levels of pedal assist run from a gentle level 1 for exercise to level 5 for steep grades. A thumb pad on the left bar changes levels without moving your hands off the grips. A pure throttle mode bypasses pedal input entirely, and walk assist creeps the bike along at 3.7 mph (6 km/h) when you are pushing it up stairs or over a rough section.
20 x 4.0 in Puncture-Resistant Fat Tires
The 4 in casings on 20 in double-wall alloy rims create a contact patch close to double that of a standard mountain bike tire, which is what produces flotation on sand and powder snow. A puncture-resistant layer under the tread reduces flats from thorns and sharp rock. Schrader valves mean you can adjust pressure at any gas station pump across the 5-30 psi working range.
LED Headlight, Brake Light, and Electronic Horn
The headlight and the integrated tail-light both run from the main pack, so there are no separate cells to keep charged. The tail-light brightens whenever either brake lever is pulled. Reflective sidewall stripes on the tires add side-on visibility, and an electronic horn gives you an audible warning for pedestrians and shared-path users.
Rear Cargo Rack and Full-Length Fenders
A bolt-on rear cargo rack is fitted from the factory and takes panniers, a top box, or a strapped-down duffel. Full-length fenders over both wheels keep road spray and trail mud off you and off the drivetrain, which matters on a bike this capable in wet conditions.
Full Specifications
Model
HKM-693459 | Electric Off-Road Bike
Frame
Reinforced moped-style step-through chassis, internal wiring
Motor
1000 W rated brushless rear hub motor, 2000 W peak
System Voltage
48 V DC, sine-wave controller
Battery
48 V 20 Ah lithium-ion (960 Wh), 21700 cells, removable and lockable
Charger
3 A smart charger, 100-240 V input
Charging Time
6-8 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
37 mph (60 km/h), electronically governed and adjustable
Range Per Charge
35-50 mi (56-80 km); 35-40 mi throttle only, over 50 mi on low assist
Climbing Grade
Up to approximately 25 degrees with a solo rider on firm ground
Peak Torque
Approximately 80 N.m
Drivetrain
Chain drive with pedals, 5 assist levels plus walk mode
Brakes
4-piston hydraulic disc, 180 mm rotors front and rear, motor cut-off levers
Suspension
Hydraulic front fork, 80 mm travel, preload adjust and lockout; rigid rear
Tires
20 x 4.0 in puncture-resistant fat tires, 5-30 psi
Wheels
20 in double-wall aluminum alloy rims, Schrader valves
Saddle
Long moped-style bench saddle with padded top
Display
Backlit LCD: speed, battery, odometer, trip, assist level, wattage, USB port
Throttle
Thumb-pad control with 5 pedal-assist levels and pure throttle mode
Lighting
LED headlight, brake-activated tail-light, reflective tire sidewalls, electronic horn
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 79 lb (36 kg) including battery
Dimensions and Fit
72.8 in length, 48.0 in wheelbase, 28.7 in standover; riders 5 ft 3 in to 6 ft 4 in
Certifications
CE, RoHS; IP65 rated electrics; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V 20 Ah pack holds 960 Wh, roughly double the 400-600 Wh that a typical commuter e-bike ships with. It is built from automotive-grade 21700 cells, which carry more energy per cell than the older 18650 format and tolerate the higher discharge current a 2000 W peak motor asks for. The pack mounts centrally and low in the frame, so the added mass helps rather than hurts the handling.
Plan on 35-40 mi (56-64 km) if you ride throttle-only on flat pavement at speed. Dropping to assist level 1 or 2 and contributing real pedal input regularly returns more than 50 mi (80 km). Soft tires, headwinds, sustained climbing, cargo on the rear rack, and temperatures below 40 F (4 C) all reduce those figures; the cold-weather loss is temporary and returns once the pack warms.
Tip: Charging from empty takes about 6-8 hours with the supplied 3 A charger. If the bike will sit for more than a month, store the pack near 50 percent charge and top it up every 4-6 weeks rather than leaving it full or flat.
The pack unlocks with the supplied key and lifts out of the frame in a few seconds, so you can carry it inside to charge while the bike stays locked up outside. It can also be charged in place through the frame-side port. The battery weighs about 11 lb (5 kg) on its own, which makes carrying a spare in a rack bag realistic for long days.
Daily Use & Care
- Set tire pressure for the surface: 20-30 psi for pavement and hardpack, 8-12 psi for sand, snow, and loose gravel where you want the casing to spread.
- Rinse mud and road salt off the frame, rims, and rotors after wet or winter rides, then dry the bike rather than leaving it wet.
- Re-torque the rear axle nuts weekly. Hub-motor torque loosens fasteners faster than a conventional bicycle does.
- Wipe and re-lubricate the chain every 100-150 mi, or immediately after riding through water, sand, or heavy dust.
- Wipe the fork stanchions clean after dirty rides so grit is not dragged past the seals on the next compression.
- Check hydraulic pad thickness monthly and replace the pads before the friction material drops below 1 mm.
- Charge indoors at room temperature on a non-flammable surface, and unplug the charger once the indicator turns green.
What's in the Box
- 1 x HKM-693459 electric off-road bike, approximately 85 percent pre-assembled
- 1 x 48 V 20 Ah removable lithium battery pack
- 1 x 3 A smart charger with 100-240 V input
- 1 x Front and rear fender set
- 1 x Rear cargo rack
- 1 x Assembly toolkit with hex wrenches and pedal spanner
- 2 x Battery keys
- 1 x User manual and quick-start guide
Frequently Asked Questions
How much assembly is required out of the box?+
The bike ships about 85 percent assembled. What remains is fitting the handlebars, the front wheel, the fenders, and the pedals, then checking brake alignment and chain tension. Most owners finish in 30-45 minutes with the supplied tools. If you are not comfortable setting brakes, have a bike shop check torque and pad alignment before the first ride.
How fast will it actually go?+
The controller governs the bike to 37.3 mph (60 km/h) in throttle-only mode on flat ground with a full pack. Rider weight, tire pressure, headwind, and gradient all affect the real figure. The speed limit can be reduced in the display settings if local rules require a lower cap.
What range should I plan for?+
Between 35 and 50 mi (56-80 km). Throttle-only riding at higher speeds lands around 35-40 mi. Assist levels 1-2 with genuine pedalling push past 50 mi. Cold weather, cargo on the rack, and steep terrain all reduce range.
Is the battery removable, and can I carry a spare?+
Yes to both. The 48 V pack unlocks with a key and lifts out of the frame, so you can charge it indoors or swap in a second pack. The battery weighs about 11 lb (5 kg), which makes carrying a spare in a rack bag practical on long rides.
Can it be ridden in rain or through puddles?+
The electrical components carry an IP65 rating for dust and water ingress, so rain and splashes are within normal use. Do not submerge the motor or the battery, avoid high-pressure washing near seals and connectors, and dry the bike after wet rides.
What braking hardware does it use?+
Four-piston hydraulic calipers on 180 mm rotors, front and rear. That is more caliper than most bikes in this class carry, and it keeps lever feel consistent on long descents and in mud or wet weather.
Does the front fork lock out?+
Yes. The 80 mm fork has both a preload collar to set sag for your weight and a lockout lever. Lock it for smooth tarmac where fork movement wastes pedalling effort, and unlock it as soon as the surface turns rough.
Do I need a license or registration?+
That depends on where you live. A 2000 W peak motor and a 37 mph top speed sit outside the common three-class e-bike framework used in many US jurisdictions and 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 shared paths.
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CERoHSUN38.3 BatteryIP65 Rated960 Wh Pack4-Piston Hydraulic Brakes330 lb Load
Why Choose the HKM-693459
Moped Looks, Bicycle Practicality
The step-through chassis, bench saddle, and full fenders give the bike a small-motorcycle presence, but it still has pedals, a bike-legal form factor, and a rear rack that takes standard panniers. You get the stance without giving up the everyday usefulness.
Genuine Off-Road Capability
Four-inch tires at low pressure float on sand and powder snow where a narrow tire digs in and stops. Add 2000 W of peak output for loose climbs and an 80 mm fork for rocks and roots, and the bike goes considerably further off pavement than its commuter kit suggests.
Three Ways to Ride
Twist on pure throttle and treat it like a small moped, dial in one of five assist levels and pedal with help, or switch assist off and ride it as a heavy fat bike. Most owners mix all three across a single ride.
Sine-Wave Control, Low Noise
The controller drives the motor with a smooth sinusoidal waveform rather than a blocky square wave. The audible result is a low hum instead of a whine, and the electrical result is less energy lost as heat under sustained load.
Carry a Spare, Double the Day
Because the pack is removable and weighs about 11 lb, a second battery in a rack bag turns a 50 mi day into a 100 mi one. That modularity is far more useful than a single fixed pack of the same total capacity.
IP65 Electrics for All Seasons
Sealed connectors, an IP65-rated motor and battery, and full fenders mean rain, slush, and trail spray are part of normal operation rather than something to plan around. Rinse the bike afterwards and keep riding.
Controls & Indicators
Power Button
On the battery pack; hold to switch the system on and off
Thumb Pad
Left-hand pad steps through 5 pedal-assist levels plus zero assist
Throttle
Right-hand grip; proportional response, works independently of assist level
Speedometer
Live speed in mph, switchable to km/h in the settings menu
Battery Gauge
Percentage readout on the LCD plus a separate LED gauge on the pack
Light Switch
Long-press the up button to toggle the headlight and tail-light
Walk Assist
Hold the down button to creep the bike forward at 3.7 mph while pushing
Pre-Ride Safety Checklist
- Set tire pressure for the terrain: 20-30 psi for pavement, 8-12 psi for sand, snow, or soft ground.
- Squeeze both brake levers. They should firm up well before the grip with no sponginess indicating air in the hydraulic line.
- Confirm the battery is seated and locked and that the display shows the state of charge you expect.
- Spin both wheels and check that nothing rubs the pads and that the rims run true after any hard off-road ride.
- Check the rear axle nuts and the stem bolts for torque, and rock the bike with the front brake on to feel for headset play.
- Set the fork: preload dialled in for your weight, lockout open if you are heading off pavement.
- Switch on the headlight and tail-light for dawn, dusk, or night riding, and wear a helmet rated for the speed this bike reaches.
- Test the throttle at walking pace in a clear area before entering traffic or committing to a trail.
Quick Troubleshooting
The motor does not engage when I use the throttle.+
Check that the display is on and showing charge, that the battery is locked into the frame, and that both brake levers are fully released - the cut-off switches disable drive while either lever is pulled. If the display shows an error code, note it and contact support.
Range has dropped compared with when the bike was new.+
Check tire pressure first; a soft fat tire on pavement costs a surprising amount of range. Then consider temperature, since cold temporarily reduces available capacity. If range is down more than 30 percent year-round after many cycles, the pack is approaching the end of its service life.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system points to air in the line or a fluid leak. Stop riding and have the system bled and inspected. Do not continue on a 37 mph bike with compromised brakes.
The fork feels harsh, or it bottoms out on every hit.+
Both symptoms are preload settings. Wind preload out if the fork feels harsh and is not using its travel; wind it in if it bottoms out repeatedly. If adjusting preload changes nothing, the fork oil or the seals need service.
The chain slaps or drops on rough ground.+
Check chain tension and the alignment of the rear wheel in the dropouts, since hub-motor torque can pull the wheel slightly out of line. If the chain is stretched past service limits, replace it before it wears the sprockets.
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, write down 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-693459 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, and the electrical assembly is rated IP65 for dust and water ingress.
- 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.
- IP65 - Dust-tight and protected against low-pressure water jets, covering motor, battery, and connectors.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This is a high-output electric bike capable of 37 mph (60 km/h). Read the manual fully before the first ride and practise throttle control in an open, traffic-free area until the response feels predictable. Off-road, walk any unfamiliar section before you ride it at speed - fat tires float over a lot, but they do not reveal what is under the surface.
- Wear a helmet on every ride. At 37 mph a bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the 330 lb (150 kg) load capacity, which includes the rider and everything carried on the rack.
- Check local law before riding on public roads or paths. A 2000 W peak motor and 37 mph top speed may place this vehicle outside standard e-bike classifications in your area.
- Bed the brake pads in with 10-15 progressive stops from moderate speed during the first few rides before riding at full pace.
- The IP65 rating covers rain and splashes, not submersion. Do not ride through water deep enough to reach the hub motor or the battery compartment.
- Charge only with the supplied 3 A 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 wet pavement, loose gravel, and downhill grades; wide tires add grip but do not remove the risk of losing traction.
HKM-693459 · 1000 W rated brushless rear hub (2000 W peak) · 48 V 20 Ah lithium (960 Wh, 21700 cells) · 37 mph (60 km/h) top speed · 35-50 mi range · 20 x 4.0 in fat tires · 80 mm hydraulic fork with lockout · 4-piston hydraulic disc brakes, 180 mm rotors · IP65 electrics · 330 lb (150 kg) load capacity · 79 lb (36 kg) bike weight. 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 level ground. 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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