Vintage-Styled Fat-Tire Electric Mountain Bike
HKM-7087827 Electric Mountain Bike
The HKM-7087827 wraps a genuinely capable drivetrain in classic lines. A 1000 W rear hub motor and a 48 V 16 Ah pack (768 Wh) hidden inside the down tube give 19-37 mi of range and a top speed of 31 mph (50 km/h) where local law permits, with a 15.5 mph (25 km/h) configuration for regions that require it. The aluminum alloy frame rides on 20 in fat tires with a suspension fork up front, stops on hydraulic discs at both ends, and shifts through 7 gears. Frame colours can be specified, so the retro look is yours to set.
1000 W Rear Hub Motor48 V 16 Ah / 768 Wh Pack31 mph Top Speed19-37 mi Range20 in Fat Tires7-Speed DrivetrainHydraulic Disc BrakesAluminum Alloy Frame
Motor
1000 W
Brushless rear hub drive
Battery
48 V 16 Ah
768 Wh in the down tube
Top Speed
31 mph
50 km/h, 25 km/h EU configuration
Range
19-37 mi
31-60 km per charge
Tires
20 in Fat
On-road and off-road tread
Payload
265 lb
120 kg rider plus cargo
Overview
Most fat-tire e-bikes look like what they are: engineering exercises with a battery bolted somewhere convenient. The HKM-7087827 takes a different route. The 768 Wh pack lives inside the down tube, the cabling is tidied away, and the silhouette borrows from a much older generation of motorcycle-influenced bicycles. Frame colours can be specified rather than picked from a list of two, which is the point of a bike sold on how it looks as much as what it does.
Underneath the styling the specification is current. A 1000 W brushless rear hub motor drives the back wheel directly, with no secondary chain or gearbox in the drive path. Where local rules allow it the bike will run to 31 mph (50 km/h); in regions that cap pedal-assist bicycles the controller can be configured to 15.5 mph (25 km/h). That single setting is the difference between a legal pedal-assist bicycle and a machine that needs registration in many places, so it is worth understanding before you order.
The 48 V 16 Ah pack stores 768 Wh and returns 19-37 mi (31-60 km) depending on how you ride. Down-tube placement is not just cosmetic: it puts the heaviest single component low and between the wheels, which measurably improves how the bike behaves in corners and on loose surfaces compared with a rack-mounted pack sitting high at the back. The pack is removable and lockable for indoor charging.
The chassis is aluminum alloy with a suspension fork at the front and a rigid rear triangle. On 20 in fat tires that combination works well: the fork handles the sharp hits that would otherwise reach your wrists, and the large-volume tires soak up everything smaller. Hydraulic disc brakes front and rear give the stopping power a 31 mph bike needs, and a 7-speed derailleur keeps pedalling worthwhile rather than symbolic.
Key Features
1000 W Brushless Rear Hub Motor
The motor is built into the rear wheel, so power reaches the ground without a secondary chain, belt, or gearbox to service. A 1000 W rating gives strong acceleration away from a standstill and enough reserve to hold speed on a moderate climb with a rider aboard. Direct hub drive is also quiet - at cruising speed tire noise is louder than the motor.
48 V 16 Ah Down-Tube Battery (768 Wh)
The pack is integrated into the down tube rather than clamped on top of it, which keeps the mass low and central and leaves the frame lines uninterrupted. 768 Wh supports 19-37 mi (31-60 km) per charge. It unlocks with a key and lifts out for indoor charging, and a full charge from empty takes roughly 6-8 hours on the supplied charger.
Front Suspension Fork with Fat-Tire Rear Compliance
A suspension fork takes the sting out of potholes, kerbs, roots, and washboard gravel before it reaches the bars. The rear stays rigid, which keeps pedalling efficient and removes a service item, and the 20 in fat tires provide the rear compliance - drop pressure a few psi and the difference over broken ground is immediate.
Hydraulic Disc Brakes, Front and Rear
Sealed hydraulic lines actuate both calipers, so lever effort is light, modulation is fine, and performance holds up in rain and mud where cable systems lose feel. There are no cables to stretch or corrode, and the system self-compensates as the pads wear. Levers cut motor power the instant either is pulled.
7-Speed Derailleur Drivetrain
Seven gears cover the useful cadence range from a standing start to the top of the bike speed range. This matters more on a fast e-bike than on a slow one: without enough top gear you simply spin out and stop contributing, and with enough of it you can still add power at 25 mph and extend the range meaningfully.
20 in Fat Tires for Road and Trail
The wide casings put a large contact patch on the ground, which means grip on gravel, forest track, wet tarmac, and packed snow. The 20 in diameter keeps standover height low and the centre of mass down, so the bike feels planted at speed and easy to handle at walking pace.
LCD Display and Integrated Lighting
A backlit LCD shows speed, battery state, assist level, trip distance, and odometer, so the information you actually use while riding is a glance away. Lighting runs off the main pack, meaning no accessory batteries to remember and no fading beam at the end of a long evening ride.
Vintage Styling with Specified Colours
Swept lines, a classic saddle profile, and the concealed battery give the bike a period look that most fat-tire e-bikes do not attempt. Frame colour can be specified rather than chosen from a default palette, which makes it a viable option for hotel and resort fleets as well as owners who care what the bike looks like parked.
Full Specifications
Model
HKM-7087827 | Electric Mountain Bike
Frame Material
Aluminum alloy, vintage-profile geometry
Motor
1000 W brushless rear hub motor
System Voltage
48 V DC
Battery
48 V 16 Ah lithium-ion (768 Wh), down-tube integrated, removable and lockable
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
31 mph (50 km/h); 15.5 mph (25 km/h) configuration available
Range Per Charge
19-37 mi (31-60 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 20 percent incline
Assist Levels
5 levels of pedal assist plus zero assist
Drivetrain
7-speed rear derailleur with index shifter
Brakes
Hydraulic disc, front and rear, with motor cut-off levers
Suspension
Front suspension fork; rigid rear triangle
Tires
20 in fat tires, mixed on-road and off-road tread
Wheels
20 in alloy rims, stainless spokes
Saddle
Padded vintage-profile saddle, upright riding position
Display
Backlit LCD: speed, battery level, assist level, trip distance, odometer
Throttle
Twist throttle, works independently of the pedal-assist level
Lighting
LED headlight and tail-light powered by the main battery
Payload Capacity
Approximately 265 lb (120 kg) rider plus cargo
Battery Placement
Integrated in the down tube, key-locked, lifts out for indoor charging
Recommended Rider Height
5 ft 3 in to 6 ft 4 in (160-193 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V 16 Ah pack stores 768 Wh inside the down tube. Integration costs a little in serviceability and buys two things back: the bike looks like a bicycle rather than a science project, and the heaviest component sits low between the wheels where it improves handling. On loose surfaces and in corners the difference between a low pack and a rack-mounted one is easy to feel.
Range spans 19-37 mi (31-60 km). The upper figure assumes level ground, moderate assist, and a rider contributing real pedal effort; the lower assumes throttle-heavy riding, hills, or a headwind. If the bike is configured to the 15.5 mph (25 km/h) limit, range moves toward the top of that band simply because aerodynamic drag rises with the square of speed. Cold below 40 F (4 C) temporarily costs 10-20 percent of usable capacity and returns as the pack warms.
Tip: Store the pack at 30-70 percent charge if the bike will sit 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 slides out of the down tube, so it can be charged at a desk while the bike stays locked outside. Charging in place also works - the port is accessible behind a sealed cover without removing anything.
Daily Use & Care
- Set tire pressure for the surface: higher for efficient tarmac riding, lower for gravel, forest track, or snow where a larger contact patch buys grip.
- Rinse the frame, rims, and drivetrain with fresh water after riding salted or muddy roads, and dry the bike before storing it.
- Re-torque the axle nuts and stem bolts weekly. Hub-motor torque loosens fasteners faster than a conventional bicycle drivetrain does.
- Clean and re-lubricate the chain every 100-150 mi or after any wet or dusty ride, and check derailleur indexing at the same time.
- Inspect brake pad thickness monthly. Hydraulic pads wear quietly until they are gone; replace before the friction material drops below 1 mm.
- Keep the fork stanchions clean and wipe them down after dusty rides so grit is not dragged past the seals.
- Charge indoors at room temperature and unplug once the charger indicator turns green rather than leaving it connected for days.
What's in the Box
- 1 x HKM-7087827 electric mountain bike, approximately 85 percent pre-assembled
- 1 x 48 V 16 Ah removable down-tube 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 pedals
- 1 x Kickstand (pre-installed)
- 1 x Illustrated user manual and assembly guide
Frequently Asked Questions
What is the difference between the 31 mph and 15.5 mph versions?+
It is a controller configuration, not different hardware. Regions that regulate pedal-assist bicycles commonly cap assist at 15.5 mph (25 km/h); where no such cap applies the bike runs to 31 mph (50 km/h). Confirm which configuration applies where you ride before ordering, because it affects how the vehicle is classified.
How much assembly is required out of the box?+
The bike arrives approximately 85 percent assembled. You fit the front wheel, align and bolt the handlebar, install the pedals and saddle, and check brake and derailleur alignment. Budget 30-45 minutes with the supplied tools, or have a bike shop finish the build and check torque if you would rather not.
What range should I plan for?+
Plan for 19-37 mi (31-60 km). Moderate assist on level ground with real pedal input reaches the top of that band; throttle-heavy riding, hills, headwind, a heavy rider, or soft tires pull it toward the bottom. The display shows live battery state so you can learn your own figures within a few rides.
Is a licence or registration required?+
It depends on the configuration and where you ride. At 15.5 mph (25 km/h) the bike falls within pedal-assist bicycle rules in many jurisdictions. At 31 mph (50 km/h) with a 1000 W motor it exceeds the common three-class US e-bike framework and may be treated as a moped or motor-driven cycle. Check your state DMV and local ordinances before riding on public roads or paths.
Why front suspension only, and not full suspension?+
On 20 in fat tires the rear compliance largely comes from the tire itself, so a rear shock adds weight, cost, and a service interval for a smaller gain than it would on a narrow-tyre bike. A rigid rear triangle also pedals more efficiently. The fork handles the sharp impacts that the tire cannot absorb on its own.
Can the battery be removed and charged indoors?+
Yes. It unlocks with the supplied key and lifts out of the down tube in seconds. You can also charge it in place through the frame-side port, whichever suits where the bike is stored.
Can I choose the frame colour?+
Yes. Colour can be specified rather than picked from a fixed pair of options, which is central to how this model is intended to be sold. Contact us with your preference and quantity before ordering so it can be confirmed against current production.
Can I still pedal it normally if the battery is flat?+
Yes. The 7-speed derailleur drivetrain is independent of the motor, so the bike rides as a bicycle with the system off. It is heavier than an unpowered bike, so treat unassisted pedalling as a way to get home rather than a riding mode.
Service & Policies
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Every order ships free. Handling Time: 0-1 business days (Monday to Friday). Transit Time: 2-5 business days (Monday to Friday). A tracking number is emailed as soon as the parcel leaves our warehouse.
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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 Battery768 Wh PackHydraulic BrakesFront SuspensionCustom Colours
Why Choose the HKM-7087827
A Fat-Tire E-Bike You Want to Look At
Concealed battery, tidy cabling, period-influenced lines, and a colour you choose. Most bikes in this class are specified purely on numbers; this one is specified on numbers and then finished as though someone cared how it would look leaning against a wall.
Genuinely Capable Off Tarmac
20 in fat tires, a suspension fork, hydraulic discs, and 1000 W at the rear wheel add up to a bike that handles forest track, gravel, and rough farm road rather than just claiming to. The tires do the heavy lifting on loose ground; the fork keeps the bars usable.
Throttle or Pedals, Your Choice
A twist throttle gives instant drive with no pedalling at all, and five levels of pedal assist scale the motor to how much you want to contribute. Most owners use both - throttle from a standstill, pedals to stretch the range, motor for the climbs.
Direct Hub Drive, Little to Service
No mid-drive gearbox, no secondary chain, no belt. The motor is part of the rear wheel, which means fewer wear items in the drive path and a ride quiet enough that you hear the surface rather than the machine.
Low Mass, Low Centre of Gravity
Putting 768 Wh of battery inside the down tube instead of on a rear rack lowers the centre of mass and centres it between the axles. On gravel, in corners, and when manoeuvring at walking pace the bike feels notably more settled for it.
Ready for Weather and Daily Use
Sealed hydraulic brake lines that cannot corrode in road film, a covered charge port, a lockable battery, and lighting powered by the main pack. This is a bike designed to be ridden through a normal week, not stored for good days.
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 the assist level
Speedometer
Live speed readout on the LCD, switchable between mph and km/h
Battery Gauge
Segmented charge indicator with percentage readout
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 and set it for the surface you plan to ride; fat tires lose pressure slowly but noticeably over a week.
- Squeeze both brake levers. They should firm up well before reaching the grip, with no sponginess suggesting air in the hydraulic line.
- Confirm the battery is locked into the down tube and the display shows the state of charge you expect.
- Spin both wheels and check that the rims run true and nothing rubs the pads, the fork lowers, or the frame.
- Verify the axle nuts and stem bolts are tight, and rock the bike with the front brake applied to check for headset play.
- Shift through all 7 gears at low speed and confirm the chain moves cleanly without skipping.
- Test the throttle at walking pace in a clear area before riding in traffic, and wear a helmet rated for the speeds this bike reaches.
- Switch on the headlight and tail-light if you will be riding near dusk.
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 the down tube, and both brake levers are fully released - the cut-off sensors disable drive while a lever is pulled. Check that the assist level is above zero. If the display shows an error code, note it and contact support.
The bike will not exceed 15.5 mph.+
That is the regional pedal-assist speed configuration rather than a fault. Which configuration your bike ships with depends on where it is delivered and the rules that apply there. Contact support before attempting any change, and confirm what is lawful where you ride.
Range dropped noticeably compared with when it was new.+
Check tire pressure first; soft fat tires on tarmac cost a great deal of range. Then consider temperature and how much throttle you have been using. If the drop exceeds 30 percent in warm weather after many charge cycles, the pack is nearing the end of its service life.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system means air in the line, a fluid leak, or badly worn pads. Stop riding and have the system inspected and bled. Do not continue riding a 31 mph bike on compromised brakes.
The chain skips under hard pedalling.+
The derailleur indexing has drifted out of adjustment, or the chain and cassette are worn. Turn the barrel adjuster a quarter turn at a time while pedalling to re-index. If it skips only in the smallest cogs, replace the chain and cassette together.
The display shows an error code and the bike will not move.+
Switch the system off, wait 30 seconds, and switch it back on. If the code returns, record the exact code and the conditions that produced it, then contact support - codes map to specific faults in the controller, motor, throttle, or battery circuits.
Certifications & Standards
The HKM-7087827 is produced in a facility operating under an ISO 9001 quality management system. The lithium cells and the assembled 48 V 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
In its unrestricted configuration this bike reaches 31 mph (50 km/h) on a 1000 W motor, which is well beyond conventional bicycle speeds. Read the manual before the first ride, start at a low assist level, and practise throttle and brake control in an open, traffic-free area until the response feels predictable.
- Wear a helmet on every ride. At 31 mph a standard bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the payload capacity of approximately 265 lb (120 kg), which includes the rider and all cargo.
- Check local law before riding on public roads or paths. A 1000 W motor with a 31 mph top speed may place this vehicle outside standard e-bike classifications in your area.
- Bed in the brake pads with 10-15 progressive stops from moderate speed during the first rides before using the full speed range.
- Do not ride through water deep enough to reach the hub motor or the battery compartment, and do not pressure-wash the bike.
- Charge only with the supplied charger, indoors, at room temperature, on a non-flammable surface, and do not leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack. Damaged lithium cells can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades; fat tires add grip but do not remove the risk of losing traction.
HKM-7087827 · 1000 W brushless rear hub motor · 48 V 16 Ah lithium (768 Wh) integrated in the down tube · 31 mph (50 km/h) top speed, 15.5 mph (25 km/h) configuration available · 19-37 mi (31-60 km) range · 20 in fat tires · aluminum alloy frame · front suspension fork · hydraulic disc brakes front and rear · 7-speed derailleur · backlit LCD display. 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 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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