Dual-Battery Fat Tire Electric Bike
HKM-218899 Electric Fat Tire Bike
The HKM-218899 wraps a 2000 W brushless rear hub motor and a 48 V dual-battery system around a rigid steel moped-style frame. The 20 x 4.0 in fat tires, hydraulic disc brakes, and 7-speed Shimano derailleur let it climb steep streets and loose paths, while the long bench saddle and round LED headlight give it a clean, city-ready silhouette.
2000 W Rear Hub Motor48 V Dual-Battery System34 mph Top Speed20 x 4.0 in Fat TiresHydraulic Disc Brakes7-Speed Shimano Drivetrain120 mi Max Range330 lb Load Capacity
Motor
2000 W
Rear hub, brushless
Battery
48 V 30 Ah
Dual removable lithium
Top Speed
34 mph
55 km/h, throttle only
Range
60-120 mi
96-193 km, varies with assist
Tires
20 x 4.0 in
Fat tread, all-terrain
Load Capacity
330 lb
150 kg rider plus cargo
Overview
The HKM-218899 is built around a reinforced steel frame with a long, flat bench saddle and a low standover height. The 20 in wheels and 4.0 in-wide tires keep the center of gravity low and the contact patch large, which helps on gravel, wet pavement, and hard-packed dirt.
Power comes from a 2000 W brushless rear hub motor paired with a 48 V dual-battery system. Riders can draw from one pack for daily trips or run both for extended range. A twist throttle delivers immediate acceleration; the 7-speed Shimano derailleur adds human power when you want to stretch range or climb.
Range varies widely with riding style. Throttle-only cruising on flat pavement returns roughly 35-50 mi. Moderate pedal-assist on the same terrain stretches that to 70-90 mi. Light assist and slow speeds can reach the 120 mi mark from a full charge. Cold weather, soft tires, hills, and heavy loads all reduce those numbers.
Stopping power comes from hydraulic disc brakes front and rear. The system is matched to the bike's 34 mph top speed and 330 lb load capacity. A round LED headlight and an integrated tail-light run off the main pack for dusk and night riding.
Key Features
2000 W Brushless Rear Hub Motor
The 2000 W rear hub motor drives the bike directly with no chain or belt losses. Peak torque pulls away confidently from stops and maintains speed on moderate hills. The sealed motor is protected from road spray and dust.
48 V Dual-Battery System
Two removable 48 V lithium packs combine for approximately 30 Ah of capacity. Run one pack for shorter trips or install both for maximum range. Each pack locks into the frame and lifts out for indoor charging.
7-Speed Shimano Derailleur Drivetrain
A Shimano 7-speed rear derailleur with indexed shifter gives a usable pedaling range from walking pace up to cruising speed. The drivetrain works independently of the motor, so you can pedal home if the battery is depleted.
20 x 4.0 in All-Terrain Fat Tires
The 20 x 4.0 in tires spread rider weight over a large contact patch. Run them at low pressure for sand and gravel, or higher pressure for pavement. The knobby tread adds grip on loose surfaces without feeling sluggish on hard ground.
Moped-Style Bench Saddle
A long, padded bench saddle accommodates a range of seating positions and leaves room for a small parcel behind the rider. The low seat height makes flat-footing at stops easy.
Round LED Headlight and Tail-Light
A round LED headlight sits low on the fork crown and throws a wide beam for city streets and paths. A brake-activated tail-light adds visibility from behind.
Front Fork and Rear Shock Absorption
A telescoping front fork soaks up potholes and curb drops, while a rear coil shock cushions larger hits. The combination keeps the ride controlled on mixed surfaces.
Hydraulic Disc Brakes, Front and Rear
Sealed hydraulic calipers deliver consistent lever feel in wet conditions. Power-off brake levers cut motor power the instant either lever is pulled.
Full Specifications
Model
HKM-218899 | Electric Fat Tire Bike
Frame Material
High-tensile steel, moped-style geometry
Motor
2000 W brushless rear hub motor
System Voltage
48 V DC
Battery
48 V 30 Ah dual lithium-ion, removable and lockable
Charger
2 A smart charger, 100-240 V input
Charging Time
8-10 hours from empty with both packs
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
34 mph (55 km/h)
Range Per Charge
60-120 mi (96-193 km), varies with terrain, rider weight, and assist level
Climbing Grade
Up to approximately 25 degrees with a solo rider
Peak Torque
95 N.m
Drivetrain
7-Speed Shimano rear derailleur with index shifter
Brakes
Hydraulic disc brakes, front and rear, with power-off levers
Suspension
Telescoping front fork plus rear coil shock
Tires
20 x 4.0 in fat tires, knobby all-terrain tread
Wheels
20 in alloy rims, stainless spokes
Saddle
Long padded bench saddle
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with 5 pedal-assist levels and zero assist
Lighting
LED headlight, brake-activated tail-light, powered by main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
Approximately 77 lb (35 kg) including batteries
Recommended Rider Height
5 ft 4 in to 6 ft 2 in (162-188 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The HKM-218899 carries two removable 48 V lithium packs with a combined capacity of approximately 30 Ah. That gives roughly 1440 Wh of energy, which is enough for long day trips and multi-stop commutes without hunting for an outlet.
Real-world range depends on how much you pedal, total rider and cargo weight, tire pressure, and terrain. Throttle-only riding on flat pavement lands in the 35-50 mi band. Moderate pedal-assist on mixed terrain regularly returns 70-90 mi. Light assist and conservative speeds can reach 120 mi from a full charge. Cold weather below 40 F (4 C) temporarily reduces available capacity by 10-20 percent.
Tip: Store the packs between 30 and 70 percent charge if the bike will sit unused for more than a month, and top them up every 4-6 weeks. Charging indoors at room temperature extends usable pack life.
Each pack unlocks with the supplied key and lifts out of the frame in a few seconds. You can charge one pack at your desk while the bike stays locked outside, or charge both packs in place through the frame-side charge port. Two keys are included.
Daily Use & Care
- Tire pressure sets the character of the ride. Run 15-20 psi on pavement for lower rolling resistance; drop to 10-12 psi for gravel and dirt so the tire 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 over time if left in place.
- Check that both axle nuts and the stem bolts are torqued before the first ride of each week. Hub-motor torque works fasteners loose faster than on a conventional bicycle.
- Wipe and re-lubricate the chain every 100-150 mi, or after any ride through standing water or dusty conditions.
- Inspect brake pad thickness monthly. Hydraulic pads wear silently until they are gone; replace when the friction material is under 1 mm.
- Charge indoors at room temperature. Unplug the charger once the indicator turns green rather than leaving it connected for days.
- Keep the display and charge port covers closed when the bike is parked outside so moisture stays out of the connectors.
What's in the Box
- 1 x HKM-218899 electric fat tire bike, approximately 85 percent pre-assembled
- 2 x 48 V 15 Ah removable lithium battery packs
- 1 x 2 A 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 User manual and assembly guide
- 1 x Front and rear reflector set
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.
Can I run the bike with only one battery installed?+
Yes. The controller draws from whichever pack is installed and switches cleanly when both are present. Running one pack reduces weight and range; running both gives the full 60-120 mi potential.
What is the actual range I should plan for?+
Plan for 60-120 mi depending on how much you pedal. Throttle-only riding at higher speeds lands closer to 35-50 mi. Moderate pedal-assist on mixed terrain regularly returns 70-90 mi. Heavier riders, headwinds, hills, and low tire pressure all reduce range.
Is a license or registration required?+
Rules vary by state and locality. A 2000 W motor and 34 mph top speed exceed the limits of the common three-class e-bike framework in many US jurisdictions, which may place this bike in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or bike paths.
How long does the battery take to charge?+
About 8-10 hours from fully empty with both packs installed and the supplied 2 A charger. Charging one pack alone takes roughly 4-5 hours. Partial top-ups take proportionally less time.
Can I pedal it if the battery runs out?+
Yes. The 7-Speed Shimano drivetrain works independently of the motor. The bike is heavy at approximately 77 lb, so pedaling home unassisted is slow going, but it is entirely possible on flat ground.
Will the brakes handle the speed and weight?+
Hydraulic disc brakes front and rear are the appropriate specification for a 34 mph bike of this weight. 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.
Is the battery removable for indoor charging?+
Yes. Both packs unlock with the supplied keys and lift out of the frame. You can also charge them in place through the frame-side charge port.
Service & Policies
Free Shipping on All Orders
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.
180 Days Purchase Protection
Your purchase is protected for 180 days from the delivery date against manufacturing defects and damage in transit. If something arrives wrong, we make it right.
30 Days Money-Back Guarantee
Not completely satisfied? Request a return within 30 days of delivery for a full refund. We keep the process simple and hassle-free.
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 Battery48 V 30 Ah PackHydraulic BrakesFat Tires7-Speed Shimano
Why Choose the HKM-218899
Dual-Battery Range Without Range Anxiety
Two removable packs give the HKM-218899 a larger energy budget than most single-battery e-bikes. Carry one pack for short trips or install both for all-day rides.
Fat Tires for Mixed Surfaces
The 20 x 4.0 in tires roll over potholes, gravel, hard-packed dirt, and wet pavement that would stop narrower tires. Lower pressure increases grip; higher pressure reduces rolling resistance.
Throttle Plus Pedal Assist
Twist the throttle for immediate acceleration, or dial in one of five pedal-assist levels and let the motor multiply your effort. Most riders use a mix of both throughout a ride.
Direct-Drive Simplicity
The motor lives in the rear hub with no mid-drive gearbox or extra chain to service. Fewer moving parts in the drive path means less maintenance and a quiet ride.
Steel Frame Built for Daily Use
The high-tensile steel frame handles the torque of a 2000 W motor and the load of a 330 lb rider plus cargo. Steel also absorbs small road buzz better than ultra-rigid aluminum.
Sealed Electrical Components
Sealed connectors, a lockable battery compartment, and hydraulic brake lines all make sense for a bike that is parked outside and ridden in varied weather.
Controls & Indicators
Power Button
Located on the battery pack; hold to switch the system on and off
Mode Buttons
Up and down buttons on the display cycle through 5 pedal-assist levels plus zero assist
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
5-segment charge indicator plus percentage readout on the LCD
Light Switch
Long-press the up button to toggle the LED headlight and integrated tail-light
Shifter
Right-hand index shifter for the 7-Speed Shimano rear derailleur
Pre-Ride Safety Checklist
- Check tire pressure and set it for the terrain you plan to ride: 15-20 psi for pavement, 10-12 psi for gravel or dirt.
- Squeeze both brake levers. They should firm up well before reaching the grip, with no sponginess that would indicate air in the hydraulic line.
- Confirm both batteries are 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 the frame.
- Verify the quick-release levers and axle nuts are tight, and that the headset has no play when you rock the bike 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.
- Check that the saddle is tight and that the pedals thread in securely before the first ride.
Quick Troubleshooting
The motor does not engage when I twist the throttle.+
Confirm the display is on and shows charge, both batteries are 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 packs may be approaching the end of their 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 34 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 rattles over bumps.+
Check that the quick-release lever on the fork is fully closed and that the wheel is seated in the dropouts. If the rattle persists, the fork may need service - inspect the stanchions for scoring.
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-218899 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and the assembled packs 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 packs 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 34 mph. Read the manual fully before the first ride and practice throttle control in an open, traffic-free area until the response feels predictable. Braking distances are longer than on a conventional bicycle.
- Wear a helmet on every ride. At 34 mph a bicycle helmet is the minimum; many riders choose a certified motorcycle or downhill helmet at these speeds.
- Do not exceed the 330 lb (150 kg) load capacity, which includes the rider and cargo.
- Check local law before riding on public roads or paths. A 2000 W motor and 34 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 during the first few rides before riding at full speed.
- Do not ride through water deep enough to reach the hub motor or the battery compartments.
- 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 packs. Damaged lithium packs can vent and ignite.
- Reduce speed substantially on gravel, wet surfaces, and downhill grades; fat tires add grip but do not eliminate the risk of losing traction.
HKM-218899 · 2000 W brushless rear hub motor · 48 V dual lithium battery system (30 Ah) · 34 mph top speed · 60-120 mi range · 20 x 4.0 in fat tires · 330 lb (150 kg) load capacity · steel moped-style frame · hydraulic disc brakes · 7-Speed Shimano derailleur. 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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For minor repairs or part replacements that can be handled personally, we provide cost-price genuine parts during the warranty period. Each order is accompanied by clear, step-by-step video tutorials to guide you through the self-repair process seamlessly.
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