Dual-Shock Electric Mountain Bike with 3000 W Hub Motor
HKM-9090899 Electric Mountain Bike
The HKM-9090899 puts a 3000 W peak brushless rear hub motor to work through a 60 V 20 Ah (1200 Wh) lithium pack, reaching up to 45 mph (72 km/h) with an assisted range of 22-30 mi. A 7-Speed drivetrain, dual hydraulic disc brakes, and a dual shock suspension - front fork plus rear shock - make it equally at home on city streets and light trails, while the aluminum frame keeps the ready-to-ride weight manageable.
3000 W Peak Rear Hub Motor60 V 20 Ah / 1200 Wh PackUp to 45 mph Top Speed22-30 mi RangeDual Hydraulic Disc Brakes7-SpeedDual Shock SuspensionAluminum Frame
Motor
3000 W
Brushless DC rear hub, peak output
Battery
60 V 20 Ah
1200 Wh lithium-ion, removable
Top Speed
Up to 45 mph
72 km/h by mode and load
Range
22-30 mi
36-48 km assisted, varies with terrain
Tires
20 in wheels
Aluminum rims, mixed-surface
Load Capacity
265 lb
120 kg rider plus cargo
Overview
The HKM-9090899 is built around a lightweight aluminum alloy frame sized for 20 in wheels. Aluminum keeps the chassis rigid where it needs to be and light where it helps handling, so the bike stays nimble through tight city streets and stable when the surface turns to gravel. The 20 in wheel size lowers the center of gravity and shortens the reach to the ground, which helps quicker acceleration and confident low-speed control.
Drive comes from a 3000 W peak brushless rear hub motor fed by a 60 V 20 Ah lithium pack that stores 1200 Wh. The 60 V architecture carries lower current than a 48 V system at the same power, which reduces resistive losses and keeps the cells cooler under hard acceleration. A twist throttle gives immediate, clutch-free drive, while the 7-Speed Shimano drivetrain and pedal assist let you add human power to extend the range.
Real-world range lands in the 22-30 mi band. Throttle-only riding at higher speed sits toward the lower end; moderate pedal-assist on mixed terrain returns more. Rider weight, sustained climbs, headwinds, and soft tire pressure all pull the figure down, so plan a little extra margin for a loaded or hilly commute. A full charge takes roughly 6-8 hours on the supplied charger.
Comfort and control hardware match the drivetrain. A front suspension fork and a rear shock absorber work together to absorb surface irregularity, with progressive spring rates and hydraulic damping that soften small bumps while resisting bottom-out on larger hits. Dual hydraulic disc brakes with large-diameter rotors provide consistent, fade-resistant stopping from 45 mph, and a color LCD plus a high-resolution PAS sensor keep the rider informed and the motor response smooth.
Key Features
3000 W Brushless Rear Hub Motor
A 3000 W peak brushless motor is laced into the rear hub. Direct drive removes the gearbox, so there is one less system to maintain and a notably quiet ride. High torque density gives strong acceleration from a standstill, and the sealed construction resists dust, debris, and light moisture ingress.
60 V 20 Ah Lithium Pack (1200 Wh)
High-energy-density 21700 cells sit in a reinforced housing and lift out with a key for indoor charging. An integrated BMS guards against over-charge, over-discharge, and thermal stress across hundreds of cycles. The 60 V design reduces current draw at high power, lowering heat and extending cell life.
Dual Shock Suspension: Fork Plus Rear Shock
A front suspension fork and a rear shock absorber act in tandem to keep the tires on the ground over broken pavement, roots, and potholes. Progressive spring rates and hydraulic damping mean small bumps are absorbed softly while larger impacts are met with rising resistance, which improves grip and rider control.
Dual Hydraulic Disc Brakes
Sealed hydraulic lines actuate both calipers, so lever effort stays light and predictable even after a long descent where heat builds. Large-diameter stainless rotors and sintered pads bite consistently in wet and dry conditions, and power-off levers cut motor drive the instant either is pulled.
7-Speed Drivetrain
A 7-Speed Shimano derailleur with indexed shifting gives a usable cadence from a walking pace up to cruising speed. The cassette range lets heavier riders climb moderate grades without overheating the pack, and the robust chain and sprockets resist wear under electric torque.
20 in Mixed-Surface Wheels
Aluminum rims with stainless spokes carry tires suited to pavement, gravel, and hardpack. The smaller diameter aids quick acceleration and a low center of gravity, while enough sidewall compliance remains to take the edge off rough sections without feeling vague on smooth roads.
LED Lighting and Sealed Electronics
An LED headlight and tail-light draw from the main pack, so there are no separate batteries to maintain. Sealed connectors, gasketed enclosures, and conformal coating on the circuit boards let the bike cope with rain and damp conditions rather than hiding from them.
Color LCD and High-Resolution PAS Sensor
A sunlight-readable color LCD shows speed, state of charge, assist level, trip distance, and odometer. The pedal-assist sensor uses a 12-piece magnetic disc and dual Hall sensors to detect both speed and direction of pedaling, giving near-instant, natural motor engagement and cut-off.
Full Specifications
Model
HKM-9090899 | Electric Mountain Bike
Frame Material
Aluminum alloy frame, geometry for 20 in wheels
Motor
Brushless DC rear hub motor, 3000 W peak output
System Voltage
60 V DC
Battery
60 V 20 Ah lithium-ion (1200 Wh), removable with BMS
Charger
Smart charger, 100-240 V input
Charging Time
Approximately 6-8 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
Up to 45 mph (72 km/h)
Range Per Charge
22-30 mi (36-48 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 15 percent grade with a solo rider
Peak Torque
High torque density for rapid acceleration from a standstill
Drivetrain
7-Speed Shimano rear derailleur with index shifter
Brakes
Dual hydraulic disc brakes, front and rear, large-diameter rotors
Suspension
Dual shock: front suspension fork plus rear shock absorber
Tires
20 in wheels with mixed-surface tires
Wheels
20 in aluminum alloy rims, stainless spokes
Saddle
Mountain-bike saddle with ergonomic rider triangle
Display
Color LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with pedal-assist levels
Lighting
LED headlight and tail-light, powered by main battery
Load Capacity
265 lb (120 kg) rider plus cargo
Bike Weight
Approximately 80 lb (36 kg) including battery
Recommended Rider Height
5 ft 3 in to 6 ft 3 in (160-190 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 60 V 20 Ah pack holds 1200 Wh. Running at 60 V keeps the current - and therefore the resistive losses - lower than a 48 V system would need at the same power, which helps the cells stay cooler under the 3000 W peak draw. High-energy-density 21700 cells and an integrated BMS that watches over voltage, temperature, and current keep performance consistent across hundreds of cycles.
Real-world range lands in the 22-30 mi band. Throttle-only riding at higher speed sits toward the lower end; moderate pedal-assist on mixed terrain returns more. Rider weight, hills, headwinds, and low tire pressure all pull the figure down, so plan a little extra margin for a loaded or hilly ride.
Tip: Charge in a cool, dry place and unplug once the indicator turns green rather than leaving it connected for days. The BMS balances the cells automatically on every charge, so there is no manual procedure to follow.
The pack locks into the frame with a key and lifts out for indoor charging; two keys are supplied. Charging in place through the frame-side port works just as well if you prefer to leave it mounted.
Daily Use & Care
- Set tire pressure for the surface: higher for pavement to lower rolling resistance, lower for dirt and gravel for grip.
- Keep the chain clean and lubricated every 100-150 mi or after wet rides; the motor adds load to the drivetrain.
- Check brake pad thickness monthly - hydraulic pads wear silently until they are gone.
- Verify axle nuts and stem bolts are torqued before the first ride of each week; hub-motor torque works fasteners loose faster than on a conventional bike.
- Charge indoors at room temperature and avoid fully depleting the pack before recharging.
- Wash the frame and drivetrain after salted or muddy rides to protect the aluminum fasteners and spokes.
- Keep the display and charge-port covers closed when parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-9090899 electric mountain bike, approximately 85 percent pre-assembled
- 1 x 60 V 20 Ah removable lithium battery pack
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of folding pedals
- 1 x Color LCD display and PAS sensor (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
How much assembly is required out of the box?+
The bike ships approximately 85 percent assembled. Remaining steps are fitting the front wheel, straightening and bolting the handlebar, installing the pedals and saddle, and checking brake alignment. Budget 30-45 minutes with the supplied tools. Have a bike shop check torque and brake bedding if you are not comfortable doing it yourself.
What is the real-world range I should plan for?+
Plan for 22-30 mi depending on how you ride. Throttle-only riding at higher speed lands toward the lower end; moderate pedal-assist on mixed terrain regularly returns more. Heavier riders, headwinds, hills, and low tire pressure all reduce range.
How fast will it go?+
Up to 45 mph (72 km/h) under favorable conditions with the 3000 W peak motor. Actual top speed varies with rider weight, terrain, and charge level. Check your local regulations before riding on public roads or paths, as this output and speed may place the bike outside standard e-bike classifications.
Is the battery removable for charging?+
Yes. It locks into the frame and lifts out with the supplied key for indoor charging, or charges in place through the frame-side port. A full charge from empty takes approximately 6-8 hours.
What kind of terrain is it suited to?+
With 20 in mixed-surface wheels, dual shock suspension, and a 7-speed drivetrain it handles paved roads, gravel paths, hardpack trails, and moderate off-road terrain. For extreme downhill or highly technical singletrack, assess the trail against your skill level.
How do the dual hydraulic disc brakes compare to mechanical ones?+
Sealed hydraulic fluid removes cable stretch and friction, giving more consistent lever feel and self-adjusting for pad wear. Modulation - the ability to control braking force precisely - is meaningfully better, which matters at 45 mph.
What is the maximum rider and cargo weight?+
The frame and components are rated for a combined 265 lb (120 kg) including the rider and cargo. Adjust tire pressure for your weight to get the right ride and range.
How does the PAS sensor improve the ride?+
A 12-piece magnetic disc with dual Hall sensors detects both the speed and direction of pedaling. The motor engages smoothly as you pedal forward and cuts immediately when you stop or back-pedal, giving a natural, intuitive feel close to a conventional bike with strong electric assistance.
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 Battery1200 Wh PackDual Hydraulic BrakesDual Shock Suspension7-Speed
Why Choose the HKM-9090899
Hub Motor, Zero Clutch
The motor lives in the rear hub with no gearbox or belt between it and the ground. Fewer moving parts in the drive path means less to maintain and a quiet, direct response when you twist the throttle.
Dual-Shock Comfort
A front fork and a rear shock work together to take the edge off broken pavement, roots, and potholes. Progressive spring rates keep small bumps soft and big hits controlled, so the tires track the surface instead of skipping across it.
Two Ways to Ride
Twist the throttle for immediate acceleration, or shift through the 7-speed Shimano rear cassette and pedal. Most riders mix both - throttle to get moving, pedals to extend the range, and motor for hills.
Whisper-Quiet Hub
A sealed brushless hub motor runs with far less noise than a combustion engine and noticeably less whine than many cheaper electric drives, which keeps the ride calm in traffic and on shared paths.
Aluminum, Light on Its Feet
The aluminum frame and 20 in wheels keep the bike nimble and easier to lift onto a rack or maneuver at low speed, while still planted enough for higher-speed straight-line tracking.
Weather-Resistant Build
Sealed connectors, gasketed enclosures, and conformal coating on the electronics let the bike cope with rain and damp conditions rather than hiding from them - useful for a daily rider.
Controls & Indicators
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Buttons
Buttons on the display cycle through the pedal-assist levels
Twist Throttle
Right-hand grip; proportional response, works independently of pedal-assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Charge indicator plus percentage readout on the color LCD
Light Switch
Handlebar switch for the LED headlight and tail-light
Shifter
Right-hand index shifter for the 7-Speed rear derailleur
Pre-Ride Safety Checklist
- Set tire pressure for the terrain: higher for pavement, lower for dirt or gravel.
- Squeeze both brake levers. They should firm up well before reaching the grip, with no sponginess in the hydraulic line.
- Confirm the battery is seated and locked, and that the display shows the expected state of charge.
- Spin both wheels and check that the rims run true and nothing rubs the brake pads or frame.
- Verify the quick-release levers and axle nuts are tight, and that the headset has no play 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 bike reaches.
- Set tire pressure for your weight to get the right ride and range.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the display is on and shows charge, the battery is locked into place, and both brake levers are fully released - brake cut-off sensors disable the motor while a lever is pulled. If the display shows an error code, note it and contact support.
Range dropped noticeably compared with when it was new.+
First check tire pressure; a soft tire on pavement is the most common cause. Then consider temperature - cold reduces available capacity temporarily. If range is down more than 30 percent year-round after many charge cycles, the pack may be approaching the end of its service life.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system usually means air in the line or a fluid leak. Stop riding and have the system bled and inspected. Do not continue riding a 45 mph bike on compromised brakes.
The chain skips under hard pedaling.+
The derailleur indexing is likely out of adjustment, or the chain and cassette are worn. Adjust the barrel adjuster a quarter turn at a time to align the indexing. If the chain skips only in the smallest cogs, the cassette is worn and should be replaced along with the chain.
The front fork or rear shock feels harsh.+
Check that the quick-release levers are fully closed and the wheels are seated in the dropouts. If the ride stays harsh over small bumps, the suspension may need service - inspect the stanchions and seals and have a shop rebuild the lowers if needed.
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, note the exact code and the conditions that produced it, then contact support - error codes map to specific faults in the controller, motor, or throttle circuits.
Certifications & Standards
The HKM-9090899 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 bicycle capable of 45 mph. Read the manual fully before the first ride and practice throttle control in an open, traffic-free area until the response feels predictable.
- Wear a helmet on every ride. At 45 mph a bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the 265 lb (120 kg) load capacity, which includes the rider and cargo.
- Check local law before riding on public roads or paths. A 3000 W motor with 45 mph top speed may place this vehicle outside standard e-bike classifications in your area.
- Bed in the brake pads with progressive stops during the first few rides before riding at full speed.
- Do not ride through water deep enough to reach the hub motor or 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 packs can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades; the tires add grip but do not eliminate the risk of losing traction.
HKM-9090899 · 3000 W brushless rear hub motor · 60 V 20 Ah lithium (1200 Wh) · up to 45 mph (72 km/h) top speed · 22-30 mi (36-48 km) range · dual hydraulic disc brakes · 7-Speed · dual shock suspension · aluminum frame · 20 in mixed-surface wheels · 265 lb (120 kg) load capacity. 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 pavement. 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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