Mid-Drive Electric Trekking Bike with Hydraulic Disc Brakes
HKM-488339 Mid-Drive Electric Bike
The HKM-488339 puts its 500 W Bafang motor at the bottom bracket rather than in a wheel hub. A mid-drive turns the crank, so the motor feeds its power through the 7-Speed Shimano drivetrain and can use the same gear range you do - drop a gear on a steep pitch and the motor gains mechanical advantage exactly as your legs do. Weight sits low and central, which is why the bike handles more like an unpowered trekking bike than most hub e-bikes do.
500 W Mid-Drive Motor48 V 13 Ah / 624 Wh Pack25 mph Top Speed27.5 x 2.1 in TiresHydraulic Disc BrakesFront suspension30-50 mi Range300 lb Load Capacity
Motor
500 W
900 W peak mid-drive
Battery
48 V 13 Ah
624 Wh LG lithium cells
Top Speed
25 mph
40 km/h on level ground
Range
30-50 mi
48-80 km, varies with assist
Tires
27.5 x 2.1 in
Mixed-surface tread tread
Load Capacity
300 lb
136 kg rider plus cargo
Overview
The HKM-488339 is a mid-drive electric bike built on a aluminum alloy trekking frame. Motor at the cranks, so it climbs through the gears instead of brute-forcing it. The frame is rated for a combined rider-and-cargo load of 300 lb (136 kg), and the recommended rider height range is 5 ft 3 in to 6 ft 3 in.
The 500 W Bafang motor sits at the bottom bracket and drives the chainring, so its output passes through the 7-Speed Shimano derailleur. Dropping a gear on a climb multiplies motor torque exactly as it multiplies yours, which is why a mid-drive of a given wattage out-climbs a hub motor of the same rating. Energy comes from a 48 V 13 Ah pack of LG cells holding roughly 624 Wh.
Real-world range is a band rather than a number because the bike adapts to how you ride it. Throttle-only riding at or near the 25 mph top speed lands near the bottom of the 30-50 mi window. Moderate assist on mixed surfaces sits in the middle. Light assist with steady pedalling on level ground is what produces the upper figure. Cold below 40 F, soft tires, headwinds, and sustained climbing all pull the number down; warm weather and correct tire pressure push it back up.
Chassis hardware is matched to the output. Front suspension fork with preload adjustment. Hydraulic disc brakes, front and rear. The 27.5 in wheel size sets the balance between rolling over obstacles and keeping the standover height manageable, and the complete bike weighs about 57 lb (26 kg) with the battery fitted.
Key Features
500 W Bafang Mid-Drive Motor
The motor is mounted at the bottom bracket and drives the chainring rather than a wheel. Because its output passes through the 7-Speed Shimano derailleur it can use the full gear range, producing roughly 80 N.m at the crank and climbing gradients that defeat hub motors of the same rating. Weight also sits low and centred, which keeps the handling close to an unpowered bike.
48 V 13 Ah Lithium Pack (624 Wh)
The pack is built from LG cells and lives behind a lockable cover, lifting out with a key so it can be charged indoors while the bike stays where it is. 624 Wh is what makes the 30-50 mi range figure possible. A full charge from empty takes about 5 hours on the supplied charger; partial top-ups take proportionally less and do the cells no harm.
Front suspension: Front suspension fork with preload adjustment
Front suspension fork with preload adjustment. Suspension is not a luxury on a bike this heavy - it is what keeps the tires loaded and steering when the surface stops being smooth, and it is the difference between arriving comfortable and arriving beaten up after an hour in the saddle.
Hydraulic disc brakes, front and rear
Sealed hydraulic lines actuate the calipers, so lever effort stays light and predictable as the rotors heat up on a long descent and there are no cables to stretch or corrode. Power-off levers cut motor drive the instant either lever is pulled, which is a meaningful safety feature on a 25 mph machine weighing 57 lb.
7-Speed Shimano derailleur
A 7-Speed Shimano derailleur gives usable pedalling cadence from walking pace up to the assist ceiling. The wide ratio spread is what lets a heavier rider contribute on a climb instead of leaving the whole job to the motor and the battery, and Shimano index shifting means each click lands in gear rather than needing to be trimmed.
27.5 x 2.1 in All-Terrain Tires by CST
The 27.5 x 2.1 in casing spreads the weight of bike and rider over a large contact patch, so the tire floats over loose gravel and packed sand instead of digging in. The mixed-surface tread tread pattern adds grip on wet pavement and light snow where a narrower road tire would skate. Pressure sets the character: firmer for pavement efficiency, softer for grip off road.
Center-mounted LCD with Full LED Lighting
A center-mounted lcd reports speed, battery state, assist level, trip distance, and odometer, and switches between mph and km/h in the settings menu. LED headlight and brake-activated tail-light both run off the main pack, so there are no separate batteries to keep charged and nothing to forget before a ride home in the dark.
Rack, Fenders, and Carrying Capacity
A rear carrier and full-length fenders are fitted from the factory rather than sold as extras, which is what turns the bike into transport instead of a toy. Total rated load is 300 lb (136 kg) including the rider, so there is genuine headroom for panniers, a week of groceries, or a loaded backpack on the way home.
Full Specifications
Model
HKM-488339 | Mid-Drive Electric Bike
Frame Material
Aluminum alloy trekking frame
Motor
500 W mid-drive motor (900 W peak), Bafang
System Voltage
48 V DC
Battery
48 V 13 Ah lithium-ion (624 Wh), LG cells, removable and lockable
Charger
Smart charger, 100-240 V input, auto cut-off
Charging Time
Approximately 5 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
25 mph (40 km/h)
Range Per Charge
30-50 mi (48-80 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 25 degrees with a solo rider
Peak Torque
80 N.m
Drivetrain
7-Speed Shimano derailleur
Brakes
Hydraulic disc brakes, front and rear by Tektro, power cut-off levers
Suspension
Front suspension fork with preload adjustment
Tires
27.5 x 2.1 in CST tires, mixed-surface tread tread
Wheels
27.5 in alloy rims, stainless steel spokes
Saddle
Padded saddle with quick-release height adjustment
Display
Center-mounted LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with 5 pedal-assist levels and zero assist
Lighting
LED headlight and brake-activated tail-light, powered by the main pack
Load Capacity
300 lb (136 kg) rider plus cargo
Vehicle Weight
Approximately 57 lb (26 kg) including battery
Recommended Rider Height
5 ft 3 in to 6 ft 3 in
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V 13 Ah pack stores about 624 Wh of energy in LG cells. For context, a typical commuter e-bike ships with 400-600 Wh, so this pack runs in the upper half of that band. That headroom is what turns the 30-50 mi figure from a laboratory number into something you can plan a day around.
Four variables move real-world range more than anything else: how much you pedal, total rider and cargo weight, tire pressure, and terrain. Throttle-only riding near the 25 mph top speed lands close to 30 mi. Moderate assist on mixed surfaces sits around 40 mi. Light assist with steady pedalling on level ground is what produces the 50 mi upper figure. Cold below 40 F (4 C) temporarily reduces available capacity by 10-20 percent; it returns once the pack warms up.
Tip: Store the pack between 30 and 70 percent charge if the machine will sit unused for more than a month, and top it up every 4-6 weeks. Charging indoors at room temperature rather than in an unheated garage measurably extends usable pack life.
The pack unlocks with the supplied key and lifts out in a few seconds, so it can be carried to a desk or workbench while the machine stays locked outside. Two keys are included. Charging in place works equally well - the charge port is accessible from the frame side without removing anything. A full charge from empty takes about 5 hours.
Daily Use & Care
- Tire pressure sets the character of the machine. Run 30-50 psi on pavement for lower rolling resistance; drop toward the lower end for gravel and dirt so the casing can flatten and grip.
- Rinse the frame, rims, and drivetrain with fresh water after riding on salted roads or wet gravel. Road film attacks fasteners and pivots if it is left in place.
- Check that the axle hardware and the stem bolts are torqued before the first ride of each week. Mid-drive torque passes through the chain, so also check chain tension and wear.
- Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or heavy dust.
- Inspect brake pad thickness monthly. Pads wear silently until they are gone; replace when the friction material is under 1 mm.
- Charge indoors at room temperature and unplug once the indicator turns green rather than leaving the charger connected for days.
- Keep the display and charge-port covers closed when the machine is parked outside so moisture stays out of the connectors.
- Check spoke tension after the first 50 mi and then every few months. A 27.5 in wheel carrying 300 lb of rated load loses tension faster than a light road wheel.
What's in the Box
- 1 x HKM-488339 mid-drive electric bike, approximately 85 percent pre-assembled
- 1 x 48 V 13 Ah removable lithium battery pack (624 Wh)
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Pair of pedals
- 1 x Toolkit with hex wrenches and a pedal spanner
- 1 x User manual and assembly guide
Frequently Asked Questions
How much assembly is required out of the box?+
The machine ships approximately 85 percent assembled. What remains is fitting the front wheel, aligning and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 30-45 minutes with the supplied tools. If you are not comfortable doing it yourself, have a bike shop check torque and bed the brake pads in.
What range should I actually plan for?+
Plan for 30-50 mi depending on how you ride. Throttle-only near the 25 mph top speed lands close to 30 mi. Moderate assist on mixed terrain returns around 40 mi. Heavier riders, headwinds, hills, cold weather, and low tire pressure all reduce the figure.
How long does the battery take to charge?+
About 5 hours from fully empty with the supplied charger. Partial top-ups take proportionally less time, and there is no need to run the pack down before recharging - lithium cells prefer shallow cycles.
Is a license or registration required?+
Rules vary by state and locality. A 500 W nominal motor with a 900 W peak and a 25 mph top speed exceeds the limits of the common three-class e-bike framework in many US jurisdictions, which 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 bike paths.
Can I pedal it if the battery runs out?+
Yes. The 7-Speed Shimano derailleur works independently of the motor. At approximately 57 lb the machine is heavy, so unassisted pedalling is slow going, but it is entirely possible on flat ground.
Is the battery removable for indoor charging?+
Yes. It unlocks with the supplied key and lifts out of its mount in a few seconds. You can also charge it in place through the frame-side charge port. Two keys are supplied.
Will the brakes cope with the speed and the weight?+
Hydraulic disc brakes, front and rear are the appropriate specification for a 25 mph machine weighing about 57 lb. Bed the pads in during the first few rides with 10-15 progressive stops from moderate speed to build the friction layer on the rotors, and brake earlier than you would on an unloaded bicycle.
How much can it carry?+
The rated load is 300 lb (136 kg) in total, which includes the rider, any passenger, and cargo. Staying inside that figure matters for the wheels and the frame, and it also matters for braking distance - a fully loaded machine needs noticeably more room to stop.
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CERoHSUN38.3 Battery624 Wh PackHydraulic BrakesFront suspensionLG Cells
Why Choose the HKM-488339
Specified Around One Job
Motor at the cranks, so it climbs through the gears instead of brute-forcing it. Every major component - motor rating, pack size, tire width, brake type - was chosen to serve that use rather than to fill a spec sheet.
Chassis Matched to the Power
A 500 W drivetrain on a bicycle chassis is a mismatch. Front suspension fork with preload adjustment and hydraulic disc brakes, front and rear are what let the 25 mph top speed be used rather than merely quoted, and they are the parts owners notice on every ride rather than only on the test ride.
Two Ways to Ride
Twist the throttle for immediate acceleration, or shift through the 7-Speed Shimano derailleur and pedal. Most owners mix the two - throttle to get moving from a stop, gears and legs to stretch the 30-50 mi range on the flat, and motor again for the hills.
Low-Maintenance Drive Path
A mid-drive drive keeps the number of wearing parts low. There is no complicated drive path to service, and the motor runs quietly enough that you hear the tires on the road before you hear the drivetrain.
Cost Per Mile Is Trivial
A full 624 Wh charge costs roughly 15 to 25 cents at typical US residential electricity rates, and it covers 30-50 mi. That is a fraction of what the same distance costs in a car, with no fuel stop, no parking charge, and no tailpipe emissions at the point of use.
Built for Repeat Use, Not a Single Season
Sealed electrical connectors, a lockable battery compartment, LG cells with roughly 800 usable charge cycles, and a aluminum alloy trekking frame frame are the specifications that decide whether a bike is still working in year three. Consumable parts - pads, tires, chain, cables - are standard sizes available from any bike shop.
Controls & Indicators
Power Button
On the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons cycle through 5 pedal-assist levels plus zero assist
Twist Throttle
Right-hand grip, proportional response, independent of assist level
Speedometer
Live speed in mph, switchable to km/h in the settings menu
Battery Gauge
Segment charge indicator plus percentage readout on the display
Light Switch
Long-press the up button to toggle the headlight and tail-light
Shifter
Right-hand index shifter for the 7-Speed Shimano derailleur
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, with no sponginess that would indicate air in the line or a stretched cable.
- Confirm the battery is seated and locked and that the display shows the state of charge you expect.
- Spin both wheels and check that the rims run true and that nothing rubs the pads or the frame.
- Verify that the axle hardware is tight and that the headset has no play when you rock the machine with the front brake applied.
- Test the throttle at walking pace in a clear area before riding in traffic.
- Switch on the headlight and tail-light if you will be riding near dusk, and wear a helmet rated for the speeds this machine reaches.
- Check that both suspension units move freely and return without binding.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the display is on and showing charge, the battery is locked into its mount, and both brake levers are fully released - the cut-off sensors disable motor drive while a lever is pulled. If the display shows an error code, note it and contact support before riding.
Range dropped noticeably compared with when it was new.+
Check tire pressure first; a soft tire on pavement is by far the most common cause. Then consider temperature, since cold temporarily reduces available capacity. 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 weak at the lever.+
Sponginess in a hydraulic system usually means air in the line or a fluid leak; in a cable system it usually means a stretched cable or glazed pads. Either way, stop riding and have the system inspected. Do not continue riding a 25 mph machine on compromised brakes.
The display shows an error code and the machine will not move.+
Power the system off, wait 30 seconds, and switch it back on. 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 sensor circuits.
There is a knocking or rattling noise over bumps.+
Check that the axle hardware is torqued and the wheels are seated in the dropouts, then check the headset for play by holding the front brake and rocking the machine fore and aft. If the noise comes from the suspension, inspect the stanchions for scoring and have the unit serviced.
The chain skips under hard pedalling.+
The derailleur indexing is most likely out of adjustment, or the chain and cassette are worn. Turn the barrel adjuster a quarter turn at a time to bring the indexing back. If it skips only in the smallest cogs, the cassette is worn and should be replaced together with the chain.
Certifications & Standards
The vehicle 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.
- 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 high-output electric vehicle capable of 25 mph. Read the manual fully before the first ride and practise throttle control in an open, traffic-free area until the response feels predictable. Braking distances at 25 mph on a 57 lb machine are much longer than most riders expect.
- Wear a helmet on every ride. At 25 mph a bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the 300 lb (136 kg) load capacity, which includes the rider, any passenger, and cargo.
- Check local law before riding on public roads or paths. A 500 W motor with a 900 W peak and a 25 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 during the first few rides before riding at full speed or with a load.
- Do not ride through water deep enough to reach the motor or the battery compartment.
- Charge only with the supplied charger, indoors, at room temperature, and on a non-flammable surface. Do not leave a charging battery unattended overnight.
- Do not attempt to open, puncture, or modify the battery pack. Damaged lithium cells can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades. Wide tires add grip but do not eliminate the risk of losing traction.
HKM-488339 · 500 W mid-drive motor (900 W peak) · 48 V 13 Ah lithium (624 Wh) · 25 mph top speed · 30-50 mi range · 27.5 x 2.1 in tires · 300 lb (136 kg) load capacity · Aluminum alloy trekking frame · front suspension · hydraulic disc brakes, front and rear. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under moderate 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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