20 in Folding 6061 Aluminum Fatbike, 624 Wh Pack
HKM-717715 Folding Electric Fat Tire Bike
The HKM-717715 is a folding electric fat tire bike built around a 500 W brushless rear hub drawing on a 48 V 13 Ah pack (624 Wh of 18650 lithium with smart BMS). Folded dimensions are quoted at roughly 35.4 x 20.1 x 28.3 in (90 x 51 x 72 cm), which is the number that decides whether a bike like this actually fits the space you had in mind. Braking is handled by mechanical disc brakes, front and rear from Tektro, the drivetrain is a 7-Speed Shimano unit, and the rolling stock is 20 x 4.0 in Chaoyang rubber on 20 in alloy rims. Suspension is suspension fork with preload adjuster, and the frame is 6061 aluminum alloy, folding rated for 300 lb (136 kg) of rider and cargo.
500 W (750 W Peak)48 V 13 Ah / 624 Wh Pack19-31 mph Top Speed19-37 mi Per Charge20 x 4.0 in Chaoyang TiresDisc Brakes Front and Rear7-Speed Shimano Drivetrain300 lb Load Capacity
Motor
500 W
750 W peak, brushless rear hub
Battery
48 V 13 Ah
624 Wh 18650 lithium with smart BMS
Top Speed
19-31 mph
30-50 km/h, condition dependent
Range
19-37 mi
31-60 km, varies with assist
Tires
20 x 4.0 in
Chaoyang casing
Load Capacity
300 lb
136 kg rider plus cargo
Overview
The HKM-717715 is folding electric fat tire bike. A 3-4 hour charge is quick for a 624 Wh pack and suits riders who top up between two trips in a day. The folding joint is the part that defines this bike. A central hinge with a cam-locked clamp splits the main triangle, the stem folds down, and the pedals fold in, which reduces the parked footprint to something that fits behind a car seat or in a hall cupboard. Check the clamp tension every few weeks, because a hinge that is allowed to work loose is the one failure point a rigid frame does not have.
Power comes from a 500 W brushless rear hub with a 750 W short-duration peak, fed by a 48 V 13 Ah pack holding 624 Wh of 18650 lithium with smart BMS. Peak torque at the wheel is quoted at 55 N.m, and the drive is rated to pull a gradient of roughly 20 degrees with a solo rider aboard. The 7-Speed Shimano drivetrain lets you add your own effort across the whole speed range rather than sitting on the throttle.
Quoted range is 19-37 mi (31-60 km), and the spread is wide because the bike adapts to how it is ridden. Throttle-only riding at the top of the speed range lands near the bottom of that band; moderate pedal assist on rolling terrain lands in the middle; light assist on flat ground with correct tyre pressure reaches the upper figure. Cold below 40 F (4 C), soft tyres, headwinds and a heavy load all pull the number down, and all of it comes back when conditions improve.
Contact with the ground is through 20 x 4.0 in Chaoyang tyres on 20 in alloy rims, and suspension is suspension fork with preload adjuster. Stopping is by mechanical disc brakes, front and rear supplied by Tektro. Kerb weight is about 62 lb (28 kg) with the pack fitted, and the frame carries a combined rider-and-cargo rating of 300 lb (136 kg). It suits flat living, van conversions and shared garages where the bike has to disappear between rides.
Key Features
500 W Brushless Hub Motor
A brushless rear hub delivers a quoted 55 N.m of torque at the wheel, with a 750 W short-duration peak available for standing starts and short ramps. There is no external gearbox in the drive path, so losses stay low and routine maintenance amounts to keeping the axle hardware torqued and the connectors clean. The drive is rated to hold a gradient of about 20 degrees with a solo rider.
48 V 13 Ah Pack, 624 Wh of Storage
The pack uses 18650 lithium with smart BMS and sits in a lockable cradle so it can be lifted out with a key and charged indoors, or charged in place through the frame-side port. A full charge from empty takes about 3-4 hours. A smart battery management system watches cell balance, temperature and current draw, and cuts the pack out before any of the three reaches a damaging level.
Suspension: Suspension fork with preload adjuster
Suspension fork with preload adjuster is fitted. The point of the setup is to keep the tyre loaded and in contact with the ground; a wheel that is skipping is a wheel that is neither driving nor steering. Set the preload for your weight before the first proper ride and re-check it after the first month of use.
Mechanical disc brakes, front and rear
Mechanical disc brakes, front and rear from Tektro are fitted at both ends. Both levers carry motor cut-off switches, so the drive is disabled the instant either one is pulled. Cable-actuated calipers are simple to service at the roadside and the pads can be swapped with basic tools. Bed the pads in during the first few rides with ten to fifteen progressive stops from moderate speed to build an even transfer layer on the rotors.
7-Speed Shimano Drivetrain
The 7-Speed Shimano drivetrain gives a usable pedalling cadence from walking pace up to the top of the bike speed range. Indexed shifting means each click lands on a defined cog rather than being trimmed by feel, and the wide ratio spread is what allows a rider to contribute meaningfully on a climb instead of leaving the whole job to the motor.
20 x 4.0 in Chaoyang Tires
Chaoyang 20 x 4.0 in casings on 20 in alloy rims spread the load across a large contact patch. Pressure is the main tuning control you have: firmer for tarmac and lower rolling resistance, softer for gravel, sand, wet grass and packed snow where the casing needs to deform and key into the surface.
LED Lighting and Backlit Display
An LED headlight and a brake-activated tail-light both run from the main pack, so there are no coin cells or separate USB lights to keep charged. The backlit display shows road speed, remaining charge, assist level, trip distance and total odometer, and switches between mph and km/h in the settings menu.
Rated for 300 lb (136 kg)
The frame, wheels and brakes are specified together for a combined rider-and-cargo figure of 300 lb (136 kg). That rating covers the rider, clothing, any luggage and anything strapped to a rack. Staying inside it is what keeps spoke tension, rim trueness and braking distance where the design intended them to be.
Full Specifications
Model
HKM-717715 | Folding Electric Fat Tire Bike
Frame Material
6061 aluminum alloy, folding
Motor
500 W brushless rear hub, 750 W peak
System Voltage
48 V DC
Battery
48 V 13 Ah lithium-ion (624 Wh), 18650 lithium with smart BMS
Charger
Smart charger with 100-240 V input and an auto-cutoff indicator
Charging Time
3-4 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent of rated capacity
Top Speed
19-31 mph (30-50 km/h)
Range Per Charge
19-37 mi (31-60 km), varies with terrain, rider weight, tyre pressure and assist level
Climbing Grade
Up to approximately 20 degrees with a solo rider
Peak Torque
55 N.m
Drivetrain
7-Speed Shimano derailleur with indexed shifter
Brakes
Mechanical disc brakes, front and rear from Tektro, with motor cut-off levers
Suspension
Suspension fork with preload adjuster
Tires
20 x 4.0 in Chaoyang all-terrain casings
Wheels
20 in alloy rims on stainless spokes
Saddle
Padded saddle with a quick-release seat clamp for tool-free height adjustment
Display
Backlit LCD: speed, charge level, assist mode, trip distance and odometer, switchable mph or km/h
Throttle and Assist
Twist throttle plus five levels of pedal assist and a zero-assist setting
Lighting
LED headlight and brake-activated tail-light, both powered from the main pack
Load Capacity
300 lb (136 kg) rider plus cargo
Vehicle Weight
Approximately 62 lb (28 kg) including the battery
Recommended Rider Height
5 ft 2 in to 6 ft 3 in (157-190 cm)
Certifications
CE and RoHS; battery cells UN38.3 tested
Battery, Range and Charging
The 48 V 13 Ah pack stores 624 Wh. For reference, a typical commuter e-bike ships with 400 to 600 Wh, so this pack sits well outside the usual energy budget. Cells are 18650 lithium with smart BMS and the assembly is managed by a battery management system that balances the cells on every charge and isolates the pack on over-current, over-temperature or under-voltage.
Real-world range of 19-37 mi (31-60 km) depends on four variables far more than any others: how much you pedal, total loaded weight, tyre pressure and gradient. Throttle-only riding near 19-31 mph sits at the bottom of the band. Moderate assist on rolling ground sits in the middle. Light assist on flat ground with tyres at the upper end of their pressure range reaches the top figure. Ambient temperature below 40 F (4 C) temporarily costs 10 to 20 percent of usable capacity, and it returns as the pack warms.
Tip: Store the pack between 30 and 70 percent charge if the bike will stand unused for more than a month, and top it up every four to six weeks. Charging indoors at room temperature rather than in an unheated garage measurably extends usable pack life.
A full charge from empty takes 3-4 hours. Partial top-ups take proportionally less and there is no benefit in running the pack flat first. The pack unlocks with the supplied key and lifts out for indoor charging, or it can be charged in place through the frame-side port without removing anything.
Daily Use & Care
- Set tyre pressure for the surface you plan to ride. Firmer on tarmac for lower rolling resistance, softer on gravel and snow so the 20 x 4.0 in casing can deform and grip.
- Rinse the frame, rims and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks fasteners and finishes if it is left in place.
- Check axle hardware and stem bolts before the first ride of each week. Motor torque works fasteners loose faster than it does on a conventional bicycle.
- Wipe and re-lubricate the chain every 100 to 150 mi, or after any ride through standing water or heavy dust.
- Inspect pad thickness monthly and replace when the friction material is under 1 mm. Pads wear quietly right up to the point where they stop working.
- Charge the 624 Wh pack indoors at room temperature and unplug once the indicator turns green rather than leaving it connected for days.
- Keep the display cover and the charge-port cap closed whenever the machine is parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-717715 folding electric fat tire bike, approximately 85 percent pre-assembled
- 1 x 48 V 13 Ah removable lithium pack (624 Wh)
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and a pedal spanner
- 1 x Pair of pedals
- 1 x LED headlight (pre-installed)
- 1 x User manual, assembly guide and warranty card
Frequently Asked Questions
How much assembly is needed out of the box?+
The HKM-717715 ships roughly 85 percent assembled. What is left is fitting the front wheel, squaring and bolting the handlebar, installing the pedals and saddle, and checking brake alignment and axle torque. Budget 30 to 45 minutes with the supplied tools. If you are not comfortable setting brake and axle torque, have a bike shop do the final check.
What range should I actually plan for?+
Plan on 19-37 mi (31-60 km). Throttle-only riding near 19-31 mph lands at the low end. Moderate pedal assist on rolling ground lands in the middle. Light assist on flat ground with correctly inflated tyres reaches the top figure. A heavy rider, a headwind, cold weather or soft tyres will each take a visible bite out of the number.
How long does a full charge take?+
About 3-4 hours from empty with the supplied charger. Partial top-ups take proportionally less time, and there is no need to run the 624 Wh pack down before recharging. Charge indoors at room temperature on a non-flammable surface.
Is a licence or registration required?+
Rules vary by state and by city. A 500 W nominal motor with a 19-31 mph ceiling generally falls inside the common three-class framework, but path access, helmet rules and minimum age are set locally. Confirm the rules where you ride before the first trip.
Can I ride it with the battery flat?+
Yes. The 7-Speed Shimano drivetrain works independently of the motor. At about 62 lb (28 kg) the bike is heavy to pedal unassisted, so treat it as a way to get home rather than a normal riding mode.
Is the battery removable for indoor charging?+
Yes. The 624 Wh pack unlocks with the supplied key and lifts out of its cradle, so it can be carried inside while the frame stays locked outdoors. It can also be charged in place through the frame-side port.
How small does it fold, and how long does it take?+
The main hinge and the stem both release with cam-locked clamps, so a fold or an unfold takes well under a minute once you have done it a few times. Always check that both clamps are fully closed and that the safety catch has engaged before riding away.
What tyre pressure should I run?+
For 20 x 4.0 in casings, run the upper part of the sidewall range on tarmac to cut rolling resistance, and drop toward the lower end for gravel, sand or packed snow so the casing can flatten and grip. Check pressure weekly; a soft tyre is the most common cause of a sudden drop in range.
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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 Battery624 Wh PackDisc Brakes7-Speed Shimano300 lb Rated
Why Choose the HKM-717715
It Folds, Which Changes Where It Can Live
A 3-4 hour charge is quick for a 624 Wh pack and suits riders who top up between two trips in a day. The HKM-717715 is specified as a whole rather than as a list of parts: the 624 Wh pack, the 500 W motor and the 6061 aluminum alloy, folding frame were chosen to work together for flat living, van conversions and shared garages where the bike has to disappear between rides.
Suspension That Earns Its Weight
Suspension fork with preload adjuster. Travel is not free; it adds weight, cost and one more thing to service. It is worth having here because folded dimensions are quoted at roughly 35.4 x 20.1 x 28.3 in (90 x 51 x 72 cm), which is the number that decides whether a bike like this actually fits the space you had in mind.
Two Ways to Make It Move
Twist the throttle for immediate drive from a standstill, or use the 7-Speed Shimano and pedal. Most owners end up mixing the two: throttle to clear a junction, gears and legs to hold a cruising speed, and full assist reserved for gradients and headwinds. Mixing the two is also what produces the range figures at the upper end of the quoted band.
Braking Specified for the Speed
Cable-actuated disc brakes from Tektro are fitted at both ends, with pads that can be replaced with basic tools. A 19-31 mph machine needs braking hardware chosen for that speed rather than carried over from a slower bike, and the motor cut-off switches in both levers mean the drive can never fight the brakes.
Running Costs Are the Quiet Advantage
A full charge of the 624 Wh pack costs a few cents of mains electricity and covers 19-37 mi. There is no fuel, no oil change and no emissions test, and the brushless drive produces no exhaust and very little noise, which matters on shared paths and in residential streets early in the morning.
Built to Be Left Outside and Used Again Tomorrow
Sealed connectors, a lockable battery cradle, an aluminum frame and disc braking that is unaffected by a wet rim are all choices that make sense for a machine that gets parked outdoors and ridden in whatever the weather is doing. Rinse road salt off after winter rides and the hardware will outlast the battery.
Controls & Indicators
Power Button
On the battery cradle; hold to switch the system on and off
Assist Buttons
Up and down keys on the display step through five assist levels plus zero
Twist Throttle
Right-hand grip, proportional response, independent of the assist level
Speedometer
Live road speed in mph, switchable to km/h in the settings menu
Charge Gauge
Segmented state-of-charge bar with a percentage readout on the display
Light Switch
Long-press the up key to toggle the headlight and tail-light
Shifter
Right-hand indexed shifter for the 7-Speed Shimano drivetrain
Pre-Ride Safety Checklist
- Check tyre pressure and set it for the surface you are about to ride.
- Squeeze both brake levers. They should firm up well before touching the grip, with no sponginess and no lever travel that keeps growing.
- Confirm the pack is seated and locked and that the display shows the charge you expect.
- Spin both wheels and check the rims run true with nothing rubbing a pad or the frame.
- Check axle hardware and any quick-release levers, and rock the machine with the front brake applied to confirm the headset has no play.
- Test the throttle at walking pace in a clear area before entering traffic or committing to a trail.
- Switch on the headlight and tail-light if you will be riding near dusk, and wear a helmet rated for 19-31 mph.
- Confirm nothing carried on a rack or in a bag can foul the wheels, the chain or the brake lines.
Quick Troubleshooting
The motor does nothing when I twist the throttle.+
Check that the display is on and showing charge, that the pack is locked into its cradle, and that both brake levers are fully released, because the cut-off switches disable the drive whenever a lever is pulled. If the display shows an error code, note it before contacting support.
Range has dropped noticeably compared with when it was new.+
Check tyre pressure first; a soft tyre on tarmac is by far the most common cause. Then consider temperature, since cold reduces available capacity temporarily. If range is down more than 30 percent year-round after many charge cycles, the pack is approaching the end of its service life.
The brakes feel spongy or the lever pulls to the grip.+
On a cable system this is usually pad wear or a stretched inner cable. Wind the barrel adjuster out to take up the slack, and if that runs out of adjustment, fit new pads and re-tension the cable. Do not continue riding a 19-31 mph machine on compromised brakes.
The chain skips under load.+
Indexing is out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time until each click lands cleanly. If the skip only happens in the smallest cogs, the cassette is worn and should be replaced together with the chain.
The front end rattles or clunks over bumps.+
Confirm the axle is fully seated in the dropouts and that any quick-release lever is properly closed. If the noise persists, inspect the fork stanchions for scoring and check headset preload; a loose headset makes exactly this noise and will damage the bearings if it is left alone.
The display shows an error code and the machine will not move.+
Switch the system off, wait 30 seconds and switch it back on. If the code returns, note the exact code and what you were doing when it appeared, then contact support. Error codes map to specific faults in the controller, motor, throttle or battery circuits.
Certifications & Standards
The HKM-717715 is produced in a facility operating an ISO 9001 quality management system. The 624 Wh 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 - Lithium battery transport safety testing, required for 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 500 W machine capable of 19-31 mph. Read the manual in full before the first ride and practise throttle control in an open, traffic-free area until the response is predictable. Loaded braking distances are noticeably longer than unloaded, so practise solo before carrying cargo.
- Wear a helmet on every ride. At 19-31 mph a standard bicycle helmet is the minimum; many riders choose a certified downhill or motorcycle helmet at these speeds.
- Do not exceed the 300 lb (136 kg) load rating, which includes the rider, clothing and everything carried.
- Check local law before riding on public roads or shared paths. A 500 W motor with a 19-31 mph ceiling may place this machine outside standard e-bike classifications where you live.
- Bed the brake pads in with ten to fifteen progressive stops during the first few rides before riding at full speed or with a load.
- Do not ride through water deep enough to reach the hub motor or the battery cradle.
- Charge only with the supplied charger, indoors, at room temperature and on a non-flammable surface. Do not leave a pack charging unattended overnight.
- Do not open, puncture or modify the battery pack. A damaged lithium pack can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces and descents. Wide tyres add grip but they do not remove the limit on available traction.
HKM-717715 · 500 W brushless rear hub · 48 V 13 Ah lithium (624 Wh) · 19-31 mph top speed · 19-37 mi range · 20 x 4.0 in Chaoyang tires · mechanical disc brakes brakes · suspension fork with preload adjuster · 300 lb (136 kg) load capacity. Specifications are provided for reference; actual performance varies with rider weight, terrain, tyre 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 on vehicle classification - confirm local regulations before riding on public roads.
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