High-Capacity Fat Tire E-Bike for City and Mountain
HKM-9348819 Fat Tire Electric Bike
The HKM-9348819 pairs a 2000 W rear hub motor with a 48 V 23 Ah lithium pack - 1104 Wh, one of the larger batteries fitted to a 20 in wheel bike - and rates the combination at up to 80 km (50 mi) per charge. Torque of 60-70 N.m and a top speed above 50 km/h (31 mph) cover both the city leisure riding and the hill trails the bike is aimed at. A high-carbon steel frame carries the load, 20 x 4.0 in tires supply the grip, a 7-speed gear set fills in around the motor, and disc brakes handle a machine that weighs 84 lb ready to ride.
2000 W Rear Hub Motor48 V 23 Ah / 1104 Wh Pack31 mph Top SpeedUp to 50 mi Range60-70 N.m Torque20 x 4.0 in Tires7-Speed Gears3-4 Hour Recharge
Motor
2000 W
Rear hub, 60-70 N.m torque
Battery
48 V 23 Ah
1104 Wh lithium-ion
Top Speed
31 mph
Over 50 km/h on level ground
Range
Up to 50 mi
Up to 80 km on a single charge
Tires
20 x 4.0 in
20 in wheels, 4 in wide casings
Bike Weight
84 lb
38 kg including battery
Overview
Two numbers define the HKM-9348819: 2000 W and 23 Ah. The first is what makes hill trails feel like flat ground; the second is what stops that power from emptying the battery inside an hour. At 48 V, 23 Ah works out to 1104 Wh - roughly double the energy budget of a mainstream commuter e-bike, and a genuinely large pack for a 20 in wheel platform. Rated range is up to 80 km (50 mi).
The motor is a rear hub unit producing 60-70 N.m of torque. Torque is the figure that matters on a climb, because it determines whether the bike pulls away cleanly from a hill start with a rider aboard or bogs while wheel speed builds. Top speed exceeds 50 km/h (31 mph) on level ground, although most owners settle into a 30-40 km/h (19-25 mph) cruise where the pack lasts considerably longer.
The frame is high-carbon steel, which is a sensible match for a bike weighing 38 kg (84 lb) and putting 2000 W through the rear dropouts. Steel handles those concentrated loads without fatiguing and takes the dents and scrapes that come with using a bike rather than displaying it. It also damps vibration, which takes some of the harshness out of long gravel sections and poorly surfaced streets.
The 20 x 4.0 in tires on 20 in rims give the bike its dual character. The small wheel diameter keeps standover height low and the handling quick, while the 4 in casings provide the flotation and grip that let the same bike work on hill trails, gravel, and packed snow. A 7-speed gear set covers the pedalling range, disc brakes handle the stopping, and an LCD display keeps the numbers in front of you.
Key Features
2000 W Rear Hub Motor, 60-70 N.m
The motor is laced into the rear wheel with no secondary chain or gearbox in the drive path, so there is very little to service and drive losses stay low. 60-70 N.m of torque is what determines behaviour on a hill start - the bike pulls away cleanly rather than waiting for wheel speed to build - and 2000 W is what lets it hold that pace all the way up.
48 V 23 Ah Lithium Pack (1104 Wh)
A 1104 Wh pack is at the top end of what 20 in wheel e-bikes carry, and it is the specification that makes a 2000 W motor practical rather than merely impressive. Rated range is up to 80 km (50 mi). The pack is key-locked to the frame and removable, and a full recharge takes just over three hours.
Suspension Fork with Fat Tire Cushioning
A telescopic suspension fork takes the edge off potholes, kerb drops, and root strikes at the front wheel. Behind it, the 4 in tire casings work as large-volume air springs that absorb the high-frequency chatter a fork reacts too slowly to catch. On an 84 lb bike that combination matters more than it would on a light machine.
Disc Brakes, Front and Rear
Disc brakes on both wheels hold their bite in the wet, where rim brakes lose effectiveness until the rim clears. They also work properly around a 4 in casing, which a rim brake struggles to reach. Power-off levers cut motor drive the moment either lever is pulled - important on a bike with this much available torque.
7-Speed Gear System
Seven ratios cover the cadence range from a slow trail climb to a road cruise. On a bike this heavy the low gears become genuinely important if the pack runs down further from home than planned, while the high gears let you keep contributing power instead of spinning out at 25 mph.
20 x 4.0 in Fat Tires on 20 in Wheels
Wide casings run soft float over packed snow, sand, and loose gravel instead of cutting in; run firm at 18-20 psi they roll efficiently on pavement. The 20 in wheel diameter keeps standover height low, sharpens steering response, and makes an 84 lb bike manageable at walking pace.
LED Headlight and Brake-Activated Tail Light
The headlight runs from the main pack, so there are no separate cells to remember before a dark ride home. The tail light illuminates whenever a brake lever is pulled, giving following traffic a clear signal at the moment it matters.
LCD Display and Steel Frame Construction
The handlebar LCD reports speed, battery level, assist mode, and trip distance so a 1104 Wh pack can be managed rather than guessed at. The high-carbon steel frame beneath it carries the motor and battery loads without flexing and accepts rack and fender mounting for commuting duty.
Full Specifications
Model
HKM-9348819 | Fat Tire Electric Bike
Frame Material
High-carbon steel, city and mountain geometry
Motor
2000 W rear hub motor
System Voltage
48 V DC
Battery
48 V 23 Ah lithium-ion (1104 Wh), removable and lockable
Charger
Smart charger, 100-240 V input
Charging Time
Approximately 3-4 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
31 mph (over 50 km/h) on level ground
Range Per Charge
Up to 50 mi (80 km); 28-37 mi (45-60 km) typical for mixed riding
Climbing Grade
Up to approximately 35 degrees with a solo rider
Peak Torque
60-70 N.m at the rear hub
Drivetrain
7-speed derailleur with index shifter
Brakes
Disc brakes, front and rear, with power-off levers
Suspension
Telescopic front suspension fork with preload adjustment
Tires
20 x 4.0 in fat tires, city and trail tread
Wheels
20 in rims, stainless spokes
Saddle
Padded saddle on a quick-release seatpost
Display
Backlit LCD: speed, battery level, assist mode, trip distance, odometer
Throttle
Twist-grip throttle with multi-level pedal assist and zero assist
Lighting
LED headlight and brake-activated tail light, powered by main battery
Load Capacity
330 lb (150 kg) rider plus cargo
Bike Weight
84 lb (38 kg) including battery
Recommended Rider Height
5 ft 2 in to 6 ft 3 in (157-190 cm)
Certifications
CE, RoHS; battery cells UN38.3 tested
Battery, Range, and Charging
The 48 V 23 Ah pack stores 1104 Wh. On a 20 in wheel bike that is a large battery by any measure - most machines in this format carry 500-700 Wh - and it is what makes a 2000 W motor usable rather than a specification that empties the pack in forty minutes. Rated range is up to 80 km (50 mi), and the pack is key-locked to the frame and removable so it can be charged indoors.
The 80 km figure assumes steady pedal-assist on level ground. Mixed riding with a fair share of climbing and throttle use realistically returns 45-60 km (28-37 mi), and sustained riding at the 50 km/h top speed will bring that down further. Tire pressure, rider weight, headwinds, and assist level are the levers you control; temperature is the one you do not. Below 40 F (4 C), expect a temporary 10-20 percent reduction in available capacity.
Tip: Store the pack between 30 and 70 percent charge if the bike 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.
A full recharge from empty takes just over three hours, which is quick for a pack this size. Two keys are supplied with the battery lock, and charging with the pack installed works equally well through the frame-side charge port.
Daily Use & Care
- Set tire pressure for the surface: 18-20 psi on pavement for lower rolling resistance, 8-12 psi on packed snow, sand, or loose gravel.
- High-carbon steel rusts where paint is chipped. Touch up stone chips promptly and rinse road salt off the frame and drivetrain after winter riding.
- Torque the rear axle nuts before the first ride of each week. A 2000 W hub motor works its own axle fasteners loose faster than any conventional wheel.
- Wipe and re-lubricate the chain every 100-150 mi, and always after riding through standing water or heavy dust.
- Inspect brake pads monthly and adjust for wear so the lever firms up early in its travel. An 84 lb bike works its pads hard.
- Clean grit off the fork stanchions after dusty or muddy rides, and check for oil weeping past the seals.
- Charge indoors at room temperature and unplug once the indicator turns green rather than leaving the charger connected for days.
What's in the Box
- 1 x HKM-9348819 fat tire electric bike, approximately 85 percent pre-assembled
- 1 x 48 V 23 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 pedals
- 1 x Handlebar-mounted LCD display (pre-wired)
- 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. The remaining steps are fitting the front wheel, aligning and bolting the handlebar, installing the pedals and saddle, and checking brake rotor alignment. Budget 30-45 minutes with the supplied tools. At 38 kg the bike is heavy to unpack, so a second pair of hands helps.
Is the 80 km range realistic?+
It is achievable with steady pedal-assist on level ground. Mixed riding with climbing and throttle use returns closer to 45-60 km (28-37 mi), and sustained riding near the 50 km/h top speed will be lower again. Treat 80 km as the upper bound.
What does 2000 W buy over a 1000 W bike?+
Mainly sustained climbing ability and acceleration under load. A 1000 W motor will get up most hills but loses speed on long grades with a heavier rider; 2000 W holds pace. The trade-off is energy consumption, which is why this model carries a 23 Ah pack rather than a smaller one.
Why a steel frame instead of aluminum?+
High-carbon steel takes the concentrated loads a 2000 W hub motor puts into the rear dropouts without fatiguing, tolerates dents and rack scuffs, and damps vibration on rough surfaces. The trade-off is the 84 lb (38 kg) total weight and the need to touch up paint chips so they do not rust.
How long does the battery take to charge?+
Just over three hours from fully empty with the supplied charger, which is fast for a 1104 Wh pack. Partial top-ups take proportionally less time, and there is no benefit to running the pack down before recharging.
Can I pedal it if the battery runs out?+
Yes. The 7-speed drivetrain is fully independent of the motor. At 84 lb the bike is heavy for unassisted pedalling, so use the low gears and expect slow progress on anything other than flat ground.
Is a license or registration required?+
Rules vary by state and locality. A 2000 W motor with a top speed over 50 km/h (31 mph) exceeds the limits of the common three-class e-bike framework in most US jurisdictions and will often place this vehicle in a moped or motor-driven cycle category. Check your state DMV and local ordinances before riding on public roads or shared paths.
Are disc brakes sufficient for an 84 lb bike at 31 mph?+
Yes, provided they are maintained. Bed the pads in with 10-15 progressive stops during the first few rides, keep the cables correctly tensioned as the pads wear, and allow noticeably more stopping distance than you would on a conventional bicycle.
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 Battery1104 Wh PackDisc Brakes60-70 N.m TorqueSteel Frame
Why Choose the HKM-9348819
Power and Capacity in Proportion
A 2000 W motor with a small battery is a specification that looks good and disappoints in use. Pairing it with 1104 Wh is what turns the power into something you can actually use for a full ride rather than for the first twenty minutes of one.
Genuinely Dual-Purpose
The same bike handles a city leisure loop and a hill trail because 4 in tires, 60-70 N.m of torque, and a suspension fork cover both. Owners who ride mixed surfaces do not have to compromise the specification toward one or the other.
Throttle and Pedals
Twist the throttle for instant torque, or shift through the 7-speed cassette and pedal to stretch the pack toward its 80 km rating. Most owners mix both - throttle from a stop and on climbs, pedals to cover distance efficiently.
Hub Drive, Minimal Servicing
With the motor in the wheel there is no mid-drive gearbox or secondary chain in the drive path. Routine maintenance is limited to the chain, the brake pads, the fork seals, and keeping the axle nuts torqued.
Fewer Charges Per Week
A 1104 Wh pack means most riders plug in once or twice a week rather than nightly. Less frequent, shallower cycling is also easier on lithium cells, which supports pack life over the years you will own the bike.
Ready for Weather
Sealed connectors, a covered and lockable battery bay, and disc brakes that keep working in the rain suit a bike used year-round rather than one reserved for dry weekends.
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 plus 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
- Set tire pressure for the day: 18-20 psi for pavement, 8-12 psi for packed snow, sand, or loose gravel.
- Squeeze both brake levers. They should firm up well before the grip; if lever travel has grown, adjust for pad wear before setting off.
- 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 with nothing rubbing the pads or the frame.
- Compress the suspension fork a few times - it should move smoothly and rebound without clunking or sticking.
- Verify the rear axle nuts, stem bolts, and seatpost clamp are tight; 2000 W puts real load through the rear dropouts.
- Test the throttle at walking pace in a clear area. An 84 lb bike with this much torque accelerates harder than most riders expect.
- Switch on the headlight and tail light for dusk rides, and wear a helmet rated for the speeds this bike reaches.
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 the frame, 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.
Range is well short of the 80 km rating.+
The rating assumes steady pedal-assist on level ground. Throttle-heavy riding at 50 km/h consumes energy several times faster. Check tire pressure first, then review your assist habits, then consider load, headwind, and temperature.
The rear wheel feels loose or the motor makes a knocking sound.+
Stop and check the rear axle nuts immediately. A 2000 W hub motor generates enough reaction torque to work its own fasteners loose, and a shifting axle will damage the dropouts and the motor cable. Retorque to specification and recheck after the next ride.
The chain skips under hard pedalling.+
Derailleur indexing is likely out of adjustment, or the chain and cassette are worn. Turn the barrel adjuster a quarter turn at a time to realign the indexing. If the chain skips only in the smallest cogs, the cassette is worn and should be replaced together with the chain.
The brakes need a long lever pull before they bite.+
Pads wear faster on an 84 lb bike than on a conventional bicycle. Adjust for pad wear so the lever firms up early in its travel; if adjustment runs out, the pads are due for replacement. Check the rotors for glazing at the same time.
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-9348819 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 electric bicycle weighing 84 lb (38 kg) with a top speed over 50 km/h (31 mph). Both the power and the mass are well beyond what most riders will have experienced on a bicycle. Read the manual fully and practise throttle control and emergency braking in an open, traffic-free area before riding in traffic or on trails.
- Wear a helmet on every ride. At 31 mph a bicycle helmet is the minimum; many riders choose a certified trail or motorcycle helmet at these speeds.
- Do not exceed the 330 lb (150 kg) rider-plus-cargo rating.
- Check local law before riding on public roads or paths. A 2000 W motor with a top speed over 50 km/h will place this vehicle outside standard e-bike classifications in most areas.
- Allow substantially more stopping distance than on a conventional bicycle - 38 kg of bike plus rider carries a great deal of momentum at 31 mph.
- Bed in the brake pads with 10-15 progressive stops during the first few rides, and adjust for pad wear regularly.
- Do not ride through water deep enough to reach the hub motor or the battery bay.
- 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.
HKM-9348819 · 2000 W rear hub motor · 60-70 N.m torque · 48 V 23 Ah lithium (1104 Wh) · 31 mph (over 50 km/h) top speed · up to 50 mi (80 km) range · 20 x 4.0 in fat tires on 20 in wheels · 7-speed gear system · disc brakes front and rear · high-carbon steel frame · 84 lb (38 kg) · LCD display · 3-4 hour recharge. 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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