Mid-Motor 2000 W Compact Fat Tire Electric Bike
HKM-6858451 Electric Mountain Bike
Two numbers define the HKM-6858451: 2000 W and 30 Ah. The motor is mounted centrally in the frame rather than in a wheel hub, which puts its considerable mass between the axles and keeps the bike balanced under hard acceleration. The 48 V 30 Ah lithium pack stores roughly 1440 Wh - enough for up to 75 mi (120 km) on a single charge, and it refills in a little over three hours. Compact 14 in fat tires, a welded steel frame, hydraulic disc brakes, and a 7-speed drivetrain complete a short-wheelbase bike that climbs hard and covers long distances.
2000 W Mid-Mounted Motor48 V 30 Ah / 1440 Wh Pack31 mph Top SpeedUp to 75 mi Range14 in Fat TiresHydraulic Disc Brakes7-Speed DrivetrainJust Over 3-Hour Charge
Motor
2000 W
Centrally mounted drive
Battery
48 V 30 Ah
1440 Wh lithium pack
Top Speed
31 mph
50 km/h, throttle only
Range
Up to 75 mi
120 km per charge
Tires
14 in Fat
Compact, high-grip casing
Charge Time
Just over 3 h
From empty
Overview
The HKM-6858451 puts its motor in the centre of the frame rather than inside a wheel. That single decision changes how the bike behaves: mass sits low and between the axles instead of hanging off the rear axle, so the front wheel stays planted under hard acceleration and the bike changes direction more willingly. On a short-wheelbase machine with 2000 W available, that balance is what keeps the power usable rather than unruly.
Energy comes from a 48 V 30 Ah lithium pack holding roughly 1440 Wh - roughly three times what a typical commuter e-bike carries. That is what supports the claimed range of up to 120 km (75 mi) on a single charge, and it means the bike can be ridden hard without the range anxiety that usually accompanies a high-power motor. Charging takes just over three hours from empty, which is fast for a pack this size.
The 14 in fat tires are a deliberate choice rather than a compromise. A smaller diameter lowers the seat height and the centre of gravity, shortens the wheelbase for quick direction changes in tight terrain, and puts a fat, high-grip casing under a bike that weighs less than a full-size machine would. The trade-off is a firmer ride over big obstacles, which is why the suspension and the wide casing matter.
Braking and gearing are specified to match the power. Hydraulic disc brakes give light, consistent lever effort even when the rotors are hot at the end of a long descent, and there are no cables to stretch. A 7-speed gear system lets you match cadence to the gradient - genuinely useful on a mid-motor bike, where the drive and your legs share the same drivetrain and gear choice affects both.
Key Features
2000 W Centrally Mounted Brushless Motor
Mounting the motor in the middle of the frame keeps its mass low and between the axles, which is why the bike stays balanced when 2000 W arrives all at once. Power is delivered through the drivetrain, so the motor benefits from the gearing you select - a low gear multiplies torque for a steep climb exactly as it does for your own pedalling.
48 V 30 Ah Lithium Pack (1440 Wh), 3-Hour Charge
At roughly 1440 Wh this is a large battery by any e-bike standard, and it supports up to 75 mi (120 km) per charge. Despite the capacity, a full recharge takes just over three hours thanks to a high-current charger. The pack locks to the frame and lifts out with a key for indoor charging.
Suspension Fork with High-Volume Fat Tire Damping
A telescopic front fork handles the sharp impacts, while the wide 14 in casing run at lower pressure provides a second stage of cushioning. On a short-wheelbase bike this combination is what stops small obstacles from unsettling the chassis at speed.
Hydraulic Disc Brakes, Front and Rear
Sealed hydraulic lines actuate both calipers, so lever effort stays light and the bite point stays consistent even when the rotors are hot at the bottom of a long descent. With no cables to stretch or corrode, the system needs far less routine adjustment than a mechanical setup - a meaningful advantage on a 31 mph machine.
7-Speed Gear System
Seven ratios give flexibility and control across changing terrain, and on a mid-motor bike they do double duty: the gear you select multiplies motor torque as well as your own. Drop into a low gear for a steep, loose climb and the drivetrain does the work the motor alone would otherwise have to.
14 in Fat Tires for Stability and Traction
The wide casing puts a large contact patch on the ground for traction on gravel, dirt, and wet tarmac, while the compact diameter keeps the seat height, centre of gravity, and wheelbase short. The result is a bike that feels planted at speed and turns quickly in tight terrain.
LED Headlight and Brake-Activated Tail-Light
Both lamps run from the main pack, so there is nothing separate to charge before a dusk ride. The tail-light brightens whenever either brake lever is squeezed, which is worth having on a bike whose closing speed on traffic is higher than drivers expect from a bicycle.
Rack Mounts and Long-Distance Carrying
Threaded mounting points accept a rear rack, panniers, or a frame bag for tools, spares, and water. With up to 75 mi of range on tap, the ability to carry a days kit is not an afterthought - it is what makes that range useful.
Full Specifications
Model
HKM-6858451 | Electric Mountain Bike
Frame Material
Welded steel, compact 14 in fat-tire geometry
Motor
2000 W centrally mounted brushless motor
System Voltage
48 V DC
Battery
48 V 30 Ah lithium-ion (1440 Wh), removable and lockable
Charger
10 A fast charger, 100-240 V input
Charging Time
Just over 3 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
31 mph (50 km/h)
Range Per Charge
Up to 75 mi (120 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 35 degrees with a solo rider
Peak Torque
110 N.m
Drivetrain
7-speed derailleur with index shifter, motor drive through the chain
Brakes
Hydraulic disc brakes, front and rear, with motor cut-off levers
Suspension
Telescopic front suspension fork; high-volume tires add compliance
Tires
14 in fat tires, high-grip all-terrain casing
Wheels
14 in rims with reinforced spoke pattern
Saddle
Padded sport saddle with quick-release seatpost clamp
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle plus multi-level pedal assist
Lighting
LED headlight and brake-activated tail-light powered by the main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 88 lb (40 kg) including battery
Recommended Rider Height
5 ft 0 in to 6 ft 2 in (152-188 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
A 48 V 30 Ah pack stores roughly 1440 Wh - around three times the energy of a typical commuter e-bike battery. That capacity is what makes a 2000 W motor practical rather than a novelty: a high-power drive empties a small pack quickly, and only a large battery turns that power into a full day of riding rather than a short blast.
Up to 75 mi (120 km) is achievable with moderate assist on level ground. Sustained full-throttle riding at 31 mph will cut that substantially - a 2000 W motor working hard can draw several times the current of a cruising 250 W bike. Terrain, rider weight, tire pressure, and temperature all move the figure; cold below 40 F (4 C) temporarily trims 10-20 percent, which returns as the pack warms up.
Tip: Charging a 1440 Wh pack in just over three hours requires a high-current charger, which produces noticeable heat. Charge on a hard, non-flammable surface with clear space around the charger, and never cover it while it works.
The pack unlocks with the supplied key and lifts out of the frame for indoor charging, or plugs in where it sits. If the bike will be unused for more than a month, store the pack at roughly 30-70 percent charge and top it up every 4-6 weeks rather than leaving it full or flat.
Daily Use & Care
- Set tire pressure for the surface. A 14 in fat tire responds strongly to pressure changes - a few psi noticeably alters both grip and ride comfort.
- Check the motor mounting hardware and chain tension monthly. A mid-mounted motor puts far more load through the chain and chainring than a hub drive does.
- Check hydraulic lever feel before every ride. The bite point should be firm and repeatable; sponginess means air in the line and needs attention before riding.
- Rinse the frame, rims, and drivetrain after muddy or salted rides, then dry the steel frame and touch up any paint chips to keep rust from starting.
- Wipe and re-lubricate the chain every 100-150 mi. Mid-motor torque wears chains faster, so inspect for stretch more often than on a hub-drive bike.
- Inspect disc pad thickness monthly and replace when the friction material is under 1 mm.
- Charge indoors at room temperature on a clear, non-flammable surface, and unplug once the indicator turns green.
What's in the Box
- 1 x HKM-6858451 electric mountain bike, approximately 85 percent pre-assembled
- 1 x 48 V 30 Ah removable lithium battery pack
- 1 x 10 A fast charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and pedal spanner
- 1 x Pair of pedals
- 1 x LCD display (pre-installed)
- 1 x User manual and assembly guide
Frequently Asked Questions
What difference does a centrally mounted motor make?+
It places the heaviest single component low and between the axles rather than at the rear axle. The bike stays balanced under hard acceleration, turns more willingly, and - because the motor drives through the chain - benefits from your gear selection, so a low gear multiplies motor torque on a climb.
Will it really do 75 mi on one charge?+
Up to 120 km (75 mi) is achievable with moderate assist on level ground, which is what the 1440 Wh pack makes possible. Sustained full-throttle riding at 31 mph will reduce that substantially. Treat 75 mi as the ceiling under favourable conditions rather than an everyday figure.
How long does such a large battery take to charge?+
Just over three hours from empty using the supplied high-current charger. That is fast for a 30 Ah pack. The charger runs warm during a full cycle, so give it clear space on a hard, non-flammable surface.
Why 14 in wheels instead of 20 in?+
Smaller wheels lower the seat height and centre of gravity and shorten the wheelbase, which makes the bike quick to change direction in tight terrain and easy to hold upright at a stop. The fat casing restores the grip and cushioning a small wheel would otherwise give up.
Is a license or registration required?+
Almost certainly, in most places. A 2000 W motor with a 31 mph top speed is well beyond the limits of every common three-class e-bike framework and is likely to be treated as a moped or motor-driven cycle. Check your state DMV and local ordinances before riding on public roads, and expect off-road or private-land use to be the default.
How heavy is the bike?+
Around 88 lb (40 kg) including the battery. Most of that is the 30 Ah pack and the mid-mounted motor. Removing the battery before lifting the bike into a vehicle makes a noticeable difference.
Can I pedal it if the battery runs out?+
Yes, but it is hard work. The 7-speed drivetrain functions independently of the motor, though at 88 lb with 14 in wheels this is not a bike designed for extended unassisted riding. Plan your range rather than relying on pedalling home.
How much assembly is required?+
The bike ships approximately 85 percent assembled. Remaining steps are the front wheel, handlebar alignment, pedals, and saddle, plus a brake and gear check. Given the power and weight, have a bike shop verify torque and brake bedding if you are not confident doing it yourself.
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CERoHSUN38.3 Battery1440 Wh PackMid-Mounted MotorHydraulic Brakes3-Hour Charge
Why Choose the HKM-6858451
Mid-Motor Balance, Not Rear-Hub Weight
Putting 2000 W at the rear axle makes a bike nose-light under acceleration. Mounting it centrally keeps the mass between the wheels, which is why this bike stays composed when you open the throttle on a loose climb.
1440 Wh Makes High Power Practical
A 2000 W motor and a small battery is a short ride. A 30 Ah pack is what turns that power into up to 75 mi of usable range, and it is the reason this bike can be ridden hard without constantly watching the charge gauge.
Gears That Multiply Motor Torque
Because the drive goes through the chain, selecting a low gear increases torque at the wheel for the motor as well as for your legs. That is a genuine mechanical advantage a hub-drive bike cannot offer on a steep pitch.
Hydraulic Brakes Sized for the Speed
A heavy, fast bike needs brakes that do not fade or need constant adjustment. Sealed hydraulic lines keep lever effort light through a long descent and remove the cable stretch that plagues mechanical systems on high-power machines.
Compact Wheels, Confident Handling
Fourteen-inch wheels keep the bike low, short, and easy to manoeuvre - you can put a foot down comfortably at a stop and change line quickly in tight terrain. The fat casing gives back the grip and comfort a small wheel would otherwise cost.
Steel Frame Built for the Load
A welded steel chassis absorbs the repeated impacts and the drivetrain loads a 2000 W mid-motor generates. It is heavier than aluminum, and on a bike carrying this much power and battery that trade is the right way round.
Controls & Indicators
Power Button
On the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons on the display cycle through the pedal-assist levels plus zero assist
Twist Throttle
Right-hand grip; proportional response, works independently of the assist level
Speedometer
Live speed readout in mph, switchable to km/h in the settings menu
Battery Gauge
Segmented charge indicator with percentage readout on the LCD
Light Switch
Long-press the up button to toggle the LED headlight and tail-light
Shifter
Right-hand index shifter for the 7-speed rear derailleur
Pre-Ride Safety Checklist
- Check tire pressure. A 14 in fat tire changes character over a few psi, so set it deliberately for the surface you plan to ride.
- Squeeze both hydraulic levers. They should firm up well before reaching the grip, with no sponginess that would indicate air in the line.
- Check chain tension and that the chainring bolts are tight - mid-motor torque loads the drivetrain far harder than a hub drive.
- Confirm the battery is seated and locked and that the display shows the expected state of charge.
- Spin both wheels and check the rims run true and neither rotor rubs its pads.
- Verify axle nuts, motor mounting hardware, and stem bolts are tight before the first ride of each week.
- Test the throttle at walking pace in a clear, open area. 2000 W responds far faster than most riders expect.
- Wear a helmet rated for the speeds this bike reaches, and consider gloves and eye protection for off-road use.
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 - the cut-off sensors disable the motor while either lever is pulled. If the display shows an error code, note it and contact support.
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 2000 W, 31 mph bike on compromised brakes.
The chain is wearing or stretching quickly.+
This is the main maintenance consequence of a mid-mounted motor: motor torque passes through the chain. Check chain stretch with a wear gauge every few hundred miles and replace early - a worn chain destroys the cassette and chainring far faster than it costs to replace itself.
Range is far short of the 75 mi figure.+
Sustained full-throttle riding at 31 mph draws several times the current of moderate assist, and it will cut range dramatically. Check tire pressure, then review how much of the ride was at full power. The 75 mi figure assumes moderate assist on level ground.
The bike feels unstable at high speed.+
A short wheelbase and 14 in wheels give quick handling, which becomes twitchy near the top speed. Check tire pressure and headset tightness first, then ride within the speed at which the bike feels composed - compact geometry is a trade-off for manoeuvrability.
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 - codes map to specific faults in the controller, motor, or throttle circuits.
Certifications & Standards
The HKM-6858451 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 2000 W vehicle capable of 31 mph and weighing roughly 88 lb. It accelerates far harder than a conventional electric bicycle. Read the manual fully before the first ride, and spend real time in an open, traffic-free area learning how the throttle responds before riding anywhere near other people.
- Wear a helmet on every ride. At 31 mph on a 2000 W machine, many riders choose a certified motorcycle or full-face downhill helmet, along with gloves and eye protection.
- Do not exceed the 330 lb (150 kg) load capacity, which includes the rider and all cargo.
- Check local law before riding anywhere public. A 2000 W motor with a 31 mph top speed is beyond every common e-bike classification and is likely to require registration, insurance, or off-road-only use.
- Apply throttle progressively on loose ground. 2000 W through a 14 in wheel will break traction instantly if opened abruptly.
- Bed in the hydraulic brake pads with 10-15 progressive stops during the first few rides before riding at full speed.
- Charge only with the supplied charger, on a hard non-flammable surface with clear space around it. A 10 A charger runs warm - never cover it or leave it unattended overnight.
- Do not attempt to open, puncture, or modify the battery pack. Damaged lithium packs can vent and ignite.
- Do not ride through water deep enough to reach the motor housing or the battery compartment, and never pressure-wash the bike.
HKM-6858451 · 2000 W centrally mounted brushless motor · 48 V 30 Ah lithium (1440 Wh) · 31 mph (50 km/h) top speed · up to 75 mi (120 km) range · 14 in fat tires · welded steel frame · hydraulic disc brakes · 7-speed drivetrain · charge time just over 3 hours · approximately 88 lb (40 kg). 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 and fall substantially under sustained full-throttle use. 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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