Electric Fat Tire Bike, 500 W to 1500 W Selectable Output, 7-Speed
HKM-2728147 Electric Fat Tire Bike with Selectable Power Output
The HKM-2728147 lets you choose how much motor you want. Three output maps - 500 W, 1000 W and 1500 W - are selected from the display, so the same bike can be a mild commuter one day and pull hard up a fire road the next. A 720 Wh battery lives inside the down tube, 26 x 4.0 in fat tires handle broken surfaces, and hydraulic discs on 180 mm rotors do the stopping.
Selectable 500 W / 1000 W / 1500 W Output48 V 15 Ah / 720 Wh Integrated Battery28 mph Top Speed26 x 4.0 in Fat TiresAluminum Alloy FrameHydraulic Disc Brakes7-Speed Drivetrain330 lb Load Capacity
Motor
1000 W
1500 W peak, 95 N.m torque
Battery
48 V 15 Ah
720 Wh lithium pack
Top Speed
28 mph
45 km/h, motor assisted
Range
31-50 mi
50-80 km, varies with assist
Tires
26 x 4.0 in
All-terrain fat tread
Load Capacity
330 lb
150 kg rider plus cargo
Overview
It is worth reading the specification of the HKM-2728147 from the chassis outward rather than from the motor in. Underneath is an aluminum alloy frame rated to 330 lb, on 26 in wheels with 26 x 4.0 in tires, stopped by hydraulic disc brakes and suspended by lockable hydraulic fork. Those parts decide how the bike behaves; the 1000 W drive and the 720 Wh pack decide how far and how fast it goes.
Selectable output is more useful than it first sounds. Range on a large motor is dominated by how much power you let it draw, so capping the bike at 500 W for a flat commute turns a 31 mi ride into something closer to 50 mi. Unlock the full 1500 W when the terrain earns it.
The drive system is brushless rear hub motor with selectable 500 W, 1000 W and 1500 W output maps, rated 1000 W continuous with 1500 W available in short bursts and roughly 95 N.m of torque. Energy comes from a 48 V 15 Ah lithium pack holding about 720 Wh, which is what sets the working range rather than the motor rating on its own. Hydraulic suspension fork with lockout and Hydraulic disc brakes, front and rear, 180 mm rotors handle the mechanical side.
Expect 31-50 mi (50-80 km) from a full charge. The lower figure reflects heavy throttle use, a loaded bike, cold weather, or steep terrain; the upper figure comes from moderate assistance on level ground with the tires at their recommended pressure. Temperatures below 40 F (4 C) temporarily reduce available capacity by 10-20 percent, and it returns as the pack warms up. Charging from empty takes 5-6 hours.
Key Features
1000 W Brushless rear Hub Motor
Rated 1000 W continuous with 1500 W available for starts and short climbs, this motor produces about 95 N.m. Sealed bearings and a weather-resistant housing keep grit and spray out of the windings, and the controller limits current to protect the motor when it is working hard at low wheel speed.
48 V 15 Ah Lithium Pack (720 Wh)
The pack is built from matched lithium cells behind a battery management system that guards against overcharge, deep discharge, short circuit, and excess temperature while balancing cells on every charge. A full charge takes 5-6 hours.
Three Controller Output Maps
Switch between 500 W, 1000 W and 1500 W from the handlebar display. This is a genuine change of current limit, which also lets riders keep the bike inside a lower power bracket where local regulations require it.
Hydraulic Disc Brakes at Both Ends
Hydraulic disc brakes, front and rear, 180 mm rotors. Braking is the system that has to scale with power and weight, and on a 79 lb bike travelling at 28 mph that is not a place to economise. Both levers carry a cut-off switch that removes motor drive the instant either is pulled.
7-Speed Derailleur Drivetrain
The 7-speed drivetrain gives a usable spread of ratios so you can contribute on a climb, hold a comfortable cadence at cruising speed, and ride home under leg power if the pack runs down. Indexed shifting is adjustable at the barrel adjuster without tools.
26 x 4.0 in Tires
All-terrain fat tread on sealed-bearing hubs. Pressure changes the character of the bike more than any other adjustment: lower for grip and float on loose ground, higher for lower rolling resistance on pavement. The recommended range is printed on the sidewall.
Aluminum Alloy Frame
Welds are dressed and the frame is rated for a combined rider and cargo load of 330 lb (150 kg). Cable routing is tidied along the tubes so nothing snags, and the mounting points for the battery, controller, and accessories are integrated rather than clamped on.
Motor Cut-Off Brake Levers
Both levers carry a cut-off switch that drops motor drive the instant either is pulled. On a 1500 W bike that is not a convenience feature - it is what stops the motor fighting the brakes if a throttle ever sticks.
Full Specifications
Model
HKM-2728147 | Electric Fat Tire Bike with Selectable Power Output
Frame Material
Aluminum alloy frame with integrated down-tube battery
Motor
1000 W (1500 W peak) brushless rear hub motor with selectable 500 W, 1000 W and 1500 W output maps
System Voltage
48 V
Battery
48 V 15 Ah lithium-ion (720 Wh)
Charger
Smart charger with automatic cut-off, 100-240 V input
Charging Time
5-6 hours
Battery Cycle Life
Approximately 800-1000 charge cycles to 80 percent capacity
Top Speed
28 mph (45 km/h)
Range Per Charge
31-50 mi (50-80 km), depending on assist level and terrain
Climbing Grade
Up to 30 percent on firm ground with rider input
Peak Torque
95 N.m
Drivetrain
7-Speed derailleur drivetrain
Brakes
Hydraulic disc brakes, front and rear, 180 mm rotors
Suspension
Hydraulic suspension fork with lockout
Tires
26 x 4.0 in, all-terrain fat tread
Wheels
26 in alloy rims with stainless spokes
Saddle
Padded saddle with quick-release height adjustment
Display
Backlit LCD with speed, battery gauge, odometer, trip and assist level
Throttle
Twist throttle with motor cut-off brake levers
Lighting
LED headlight and brake-activated tail light
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
79 lb (36 kg) including battery
Recommended Rider Height
5 ft 3 in to 6 ft 3 in (160-190 cm)
Certifications
CE, RoHS, UN38.3 Battery
Battery, Range, and Charging
The 48 V 15 Ah pack stores about 720 Wh. Range is set by that figure divided by how much energy the bike uses per mile, and consumption swings widely with assist level, rider weight, tire pressure, and gradient. That is why the quoted band is 31-50 mi (50-80 km) rather than a single number.
A full charge takes 5-6 hours from empty on the supplied smart charger, which tapers current as the pack fills and cuts off automatically. Partial charges do no harm to lithium cells - in fact, keeping the pack between roughly 20 and 90 percent for daily use extends its service life compared with routinely running it flat and filling it to 100 percent.
Tip: Store the pack between 30 and 70 percent charge if the bike will sit unused for more than a month, and top it up every 4-6 weeks. Charging indoors at room temperature gives noticeably better pack life than charging in an unheated garage in winter.
The pack releases with the supplied key so it can be carried indoors and charged at a desk while the bike stays locked outside. Two keys are included. Charging in place works equally well - the port is reachable without removing anything.
Daily Use & Care
- Tire pressure sets the character of the bike more than any other adjustment. Check it before every few rides; 26 x 4.0 in tires lose pressure faster than they look like they should, and a soft tire costs range as well as handling.
- Keep the chain clean and lightly lubricated. Wipe the outside of the links with a rag, apply a drop of lubricant to each roller, then wipe the excess off - lubricant left on the outside of the chain simply collects grit.
- Check brake pad thickness every month or so. Hydraulic Disc Brakes should be replaced well before the friction material reaches the backing plate, and squealing under light braking usually means contamination rather than wear.
- Retorque the axle nuts, stem bolts, and handlebar clamp after the first 30 mi and then every couple of months. Electric bikes transmit more load into fasteners than an unpowered bicycle does.
- Rinse mud off with a low-pressure hose or a bucket and sponge. Never point a pressure washer at hub bearings, the motor, the display, or the battery connector; forcing water past a seal is how electrical faults start.
- Charge the pack indoors at room temperature where you can see it, and unplug it once the charger indicates a full charge. Do not leave it connected for days at a time.
- Check spoke tension by squeezing pairs of spokes together every few weeks. A loose spoke on a 26 in wheel carrying 330 lb of load will let the rim go out of true quickly.
What's in the Box
- 1 x HKM-2728147 electric fat tire bike with selectable power output, approximately 85 percent pre-assembled
- 1 x 48 V 15 Ah lithium battery pack with two keys
- 1 x smart charger with regional plug
- 1 x front wheel with axle hardware, pre-trued
- 1 x handlebar and stem assembly with pre-routed cables
- 1 x pedal set, left and right marked
- 1 x tool kit with hex keys, spanner, and pedal wrench
- 1 x illustrated assembly and owner manual with torque figures
Frequently Asked Questions
How much assembly is required out of the box?+
The bike arrives roughly 85 percent assembled. You fit the front wheel, handlebar, pedals, and seatpost, then check brake alignment and torque the fasteners to the figures in the manual. Most people finish in 30-45 minutes with the supplied tools.
What range should I actually expect?+
Between 31-50 mi (50-80 km). Heavy throttle use, a loaded bike, cold weather, and hills push you toward the lower figure; moderate assistance on level ground with correct tire pressure gets you toward the upper one.
How long does a full charge take?+
5-6 hours from empty on the supplied charger. The charger tapers current as the pack fills and cuts off on its own, so it will not overcharge if you leave it connected a little longer than needed.
Is it legal to ride on the road?+
Assistance is available up to 28 mph. Many United States jurisdictions cap Class 3 pedal assistance at 28 mph and restrict throttle use above 20 mph, so the controller can be set to a compliant limit from the display. Confirm your state and local rules before riding on public roads.
What rider height does it suit?+
The frame suits riders from 5 ft 3 in to 6 ft 3 in (160-190 cm). Standover and reach matter more than total height, so if you are near the edge of that band, check standover clearance before ordering.
Can I ride it in the rain?+
Yes, in normal wet weather. The electrical connections, controller, and display are sealed against spray. Avoid riding through standing water deep enough to submerge the hub or the battery connector, and do not use a pressure washer to clean it afterwards.
Does switching to 500 W really extend range?+
Yes, substantially. Consumption scales with the current the controller is allowed to draw. Riders typically see 40-60 percent more distance in the 500 W map on flat ground compared with running at 1500 W.
Will the motor overheat in the 1500 W setting?+
Not in normal use. On a long, steep, low-speed climb any hub motor heats up because there is little airflow and low wheel speed. Pedal along in a low gear to share the load and the temperature stays in range.
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 Battery720 Wh Integrated PackSelectable OutputHydraulic Brakes330 lb Load Capacity
Why Choose the HKM-2728147
Electric Fat Tire Bike
Everything on this bike is chosen around one job. The 1000 W motor, the 720 Wh pack, and the aluminum alloy frame with integrated down-tube battery chassis are matched to each other rather than assembled from whatever was on the shelf, and that is what you feel in the first mile.
One Bike, Three Characters
Cap it low for range and gentle delivery, or run it wide open for climbing. You are not stuck with the compromise the factory chose.
Two Ways to Ride
Use the assistance to flatten a headwind or a hill, or turn it down and ride under your own power with the motor idle. The 7-speed drivetrain means the bike still works as a bicycle when the pack is empty.
Integrated Pack, Clean Lines
The 720 Wh battery inside the down tube keeps mass low and central and protects the cells from spray. It still lifts out with a key for indoor charging.
Cheaper and Quieter Than Driving
A full charge costs a few cents of electricity and covers 31-50 mi. There is no fuel, no oil change, and no exhaust, and the bike is quiet enough to hold a conversation alongside.
Built for Daily Use, Not Just Weekends
Sealed connectors, a weather-resistant display, and shielded cable runs mean the bike copes with being ridden in the wet and left outside a shop. Parts that wear are standard sizes you can source anywhere.
Controls & Indicators
Power Button
On the battery pack; hold it to switch the system on or off. The display wakes with it and shows the current charge level.
Mode Buttons
Up and down step through the assist levels; holding the down button engages walk assist, which moves the bike at a slow pace while you push it.
Throttle
Twist throttle on the right grip with progressive response.
Speedometer
Live speed on the display in mph or km/h, switchable in the settings menu along with wheel size and units.
Battery Gauge
A five-segment gauge on the display, with a voltage readout available in the settings menu for a more precise figure.
Light Switch
Holding the up button switches the headlight, tail light, and display backlight on and off together.
Shifter
Indexed shifter on the right grip controlling the 7-speed drivetrain. Ease off the pedals as you shift under motor power.
Pre-Ride Safety Checklist
- Check tire pressure and set it for the surface you plan to ride.
- Squeeze both brake levers; they should firm up well before reaching the grip, and the wheels should not turn with the levers held.
- Confirm the battery is locked into its mount and the connector is fully seated.
- Check that the quick-release levers on the seatpost and wheels are closed and tight.
- Spin each wheel and look for rub against the brake pads or a wobble that suggests a loose spoke.
- Switch the system on and confirm the display shows charge level and no fault code.
- Test the lights, and fit a helmet before you set off.
- Test the assistance at walking pace in a clear space before joining traffic, especially if you are new to the bike.
Quick Troubleshooting
The motor does not engage.+
Confirm the display is on and showing an assist level above zero, then check that the battery is locked in and its connector is fully seated. Squeeze and release both brake levers - a sticking cut-off switch keeps the motor disabled.
Range has dropped noticeably.+
Check tire pressure first; a soft tire is the most common cause. Cold weather accounts for 10-20 percent. If range has fallen permanently by more than about a third, the pack is approaching the end of its useful life.
The brakes squeal.+
Usually contamination rather than wear. Clean the rotors with isopropyl alcohol and a clean rag, and sand the pad faces lightly on fine paper. If the noise continues, the pads have absorbed oil and need replacing.
The chain slips or shifts poorly.+
Turn the barrel adjuster at the shifter a quarter-turn at a time until the chain settles in each gear. If it slips under load in every gear, the chain and sprockets are worn and should be replaced together.
The display shows a fault code.+
Switch the system off, wait ten seconds, and switch it back on; transient codes usually clear. Persistent codes are listed in the manual with their meanings - note the code before contacting support.
The bike pulls to one side under braking.+
One caliper is likely dragging or misaligned. Loosen the caliper mounting bolts, squeeze the lever hard to centre the caliper on the rotor, then retighten while holding the lever.
Certifications & Standards
The HKM-2728147 is produced in a facility operating under an ISO 9001 quality management system. The 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
Assistance is available up to 28 mph. Many United States jurisdictions cap Class 3 pedal assistance at 28 mph and restrict throttle use above 20 mph, so the controller can be set to a compliant limit from the display. Confirm your state and local rules before riding on public roads. Wear a helmet on every ride and add gloves and eye protection as speed and terrain increase.
- Wear a correctly fitted helmet on every ride.
- Ride within your sight lines and leave room to stop; a 79 lb bike at 28 mph needs more distance than you expect.
- Use the lights in poor visibility, not only after dark.
- Do not carry a passenger unless the frame and seating are designed for one.
- Keep the battery away from heat sources and do not charge a pack that has been dropped, dented, or soaked.
- Use only the supplied charger; a mismatched charger is the most common cause of lithium pack damage.
- Check brakes and tire pressure before each ride.
- Confirm local regulations before riding on public roads or shared paths - class 3 style operation.
HKM-2728147 · 1000 W (1500 W peak) · 48 V 15 Ah (720 Wh) · 28 mph top speed · 31-50 mi range · 26 x 4.0 in tires · 330 lb (150 kg) load capacity · aluminum alloy frame with integrated down-tube battery · lockable hydraulic fork · hydraulic disc brakes. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under moderate assistance 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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