Central Motor Smart Fat Tire Electric Bike
HKM-3383507 Mid-Drive Fat Tire Electric Bike
The HKM-3383507 is a mid-drive fat tire electric bike built around a 1000 W mid-drive central motor and a 48 V 17.5 Ah lithium pack storing 840 Wh. Assist runs to 28 mph (45 km/h) and a charge covers 31-37 miles depending on assist level, rider weight and surface. What sets it apart is a central motor plus app connectivity and a USB charge port, so ride data and phone power both come off the main battery. It is aimed at connected commuting, trail days and riders who track every ride.
1000 W Mid-Drive Central Motor48 V 17.5 Ah Battery (840 Wh)28 mph Top Speed31-37 mi Range26 x 4.0 in TiresHydraulic Disc Brakes7-Speed Shimano330 lb Load Capacity
Motor
1000 W
mid-drive central brushless
Battery
48 V 17.5 Ah
840 Wh lithium pack
Top Speed
28 mph
45 km/h assisted
Range
31-37 mi
varies with assist and terrain
Tires
26 x 4.0 in
26 in wheels
Load Capacity
330 lb
rider plus cargo
Overview
The HKM-3383507 is positioned as a mid-drive fat tire electric bike rather than a general-purpose bicycle with a motor bolted on. The defining detail is a central motor plus app connectivity and a USB charge port, so ride data and phone power both come off the main battery, and the rest of the specification is chosen to support that: 26 x 4.0 in tires, a aluminum alloy frame and front suspension fork with lockout, 100 mm travel.
Drive comes from a 1000 W mid-drive central motor fed by a 48 V 17.5 Ah pack holding 840 Wh. Peak torque is quoted at 120 N.m at the crank. The controller manages current, temperature and low-voltage cut-off, and assist is available up to 28 mph (45 km/h). Expect 31-37 miles from a charge; throttle-heavy riding on soft ground sits at the low end of that band and moderate pedal assist on firm surfaces at the high end.
The chassis is a aluminum alloy frame rated for 330 lb of rider and cargo, running 26 x 4.0 in tires on 26 in wheels with front suspension fork with lockout, 100 mm travel. Braking is handled by hydraulic disc, 180 mm rotors. Complete weight is approximately 70 lb with the battery installed, which is worth knowing before you plan to lift it onto a car rack.
Day to day, the 7-Speed Shimano drivetrain keeps cadence sensible when you want to pedal, the backlit display puts speed, assist level and battery state in one place, and the lighting runs off the main pack so it is charged whenever the bike is. Typical use is connected commuting, trail days and riders who track every ride.
Key Features
1000 W Mid-Drive Central Motor
A 1000 W mid-drive central motor delivers 120 N.m at the crank and holds 28 mph on level ground. Brushless construction means no brushes to wear and no routine service inside the motor itself.
1000 W Central Motor
The motor drives the chain rather than a wheel hub, so it works through the 7-Speed Shimano drivetrain. Every gear multiplies motor torque, which is why a central motor pulls harder on sustained climbs than a hub motor of the same rating.
Torque-Sensing Pedal Assist
A torque sensor measures pedal force many times per second and scales assist to match. The HKM-3383507 feels like a stronger version of you rather than a switch that turns on a few pedal strokes late, and it uses less energy doing it.
48 V 17.5 Ah Lithium Battery (840 Wh)
The pack stores 840 Wh, enough for 31-37 miles depending on assist level, rider weight and terrain. Cells are matched and monitored by a BMS that manages over-charge, over-discharge, short circuit and temperature limits.
Hydraulic disc, 180 mm rotors
Braking is the part most often under-specified on a bike this quick. The HKM-3383507 uses Hydraulic disc, 180 mm rotors at both ends so lever effort stays low and stopping distance stays predictable with a load on board or on a long descent.
26 x 4.0 in All-Terrain Tires
The 26 x 4.0 in casing runs at low pressure so the contact patch spreads instead of digging in. That is what lets the HKM-3383507 hold a line on gravel, packed sand and wet grass, and the air volume doubles as suspension on washboard surfaces.
App Connectivity and USB Port
A Bluetooth link reports speed, battery state and trip data to a phone, and a USB port on the display charges that phone from the main 840 Wh pack while you ride.
Backlit Multi-Function Display
Speed, battery voltage, assist level, trip and odometer are all on one backlit panel readable in daylight. Assist levels and the speed limit are set from the same three buttons without tools.
Full Specifications
Model
HKM-3383507 | Mid-Drive Fat Tire Electric Bike
Frame Material
Aluminum alloy
Motor
1000 W mid-drive central motor
System Voltage
48 V DC
Battery
48 V 17.5 Ah lithium-ion (840 Wh)
Charger
Smart charger, 100-240 V input
Charging Time
5-8 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
28 mph (45 km/h)
Range Per Charge
31-37 mi, varies by assist, load and terrain
Climbing Grade
Up to approximately 30 degrees with solo rider
Peak Torque
120 N.m at the crank
Drivetrain
7-Speed Shimano
Brakes
Hydraulic disc, 180 mm rotors
Suspension
Front suspension fork with lockout, 100 mm travel
Tires
26 x 4.0 in
Wheels
26 in rims with stainless spokes
Saddle
Padded saddle with quick-release height adjustment
Display
Backlit LCD: speed, battery, assist level, trip and odometer
Throttle
Thumb throttle with multi-level pedal assist
Lighting
LED headlight and tail light powered by the main battery
Load Capacity
330 lb rider plus cargo
Vehicle Weight
Approximately 70 lb including battery
Recommended Rider Height
5 ft 1 in to 6 ft 4 in (155-193 cm)
Certifications
CE and RoHS compliant; UN38.3 battery transport tested
Battery, Range and Charging
The 48 V 17.5 Ah pack stores 840 Wh. Paired with a 1000 W motor that supports a realistic 31-37 mile band, which is the figure to plan routes around rather than an optimistic laboratory figure.
Throttle-only riding at or near 28 mph returns the low end of that band. Moderate pedal assist on firm surfaces returns the high end. Soft sand, deep snow and sustained climbing can cut range by 30-40 percent, and temperatures below 40 F temporarily reduce available capacity by roughly 10-15 percent.
Tip: Store the pack between 30 and 70 percent charge if the HKM-3383507 will sit unused for more than a few weeks, and top it up every couple of months. Leaving the pack deeply discharged in storage shortens its service life.
Charging takes 5-8 hours from empty with the supplied charger. Charge indoors on a hard non-flammable surface, in view, and unplug once the indicator shows full. Use only the charger supplied with the bike.
Daily Use & Care
- Check tire pressure before each ride; 26 x 4.0 in tires lose noticeable pressure week to week and under-inflation is the most common cause of disappointing range.
- Squeeze both brake levers before setting off and confirm they firm up well before reaching the grip.
- Inspect brake pads monthly and replace them once the friction material is under 1 mm.
- Clean and lubricate the chain every few hundred miles, more often after wet or dusty rides, and wipe the excess off so it does not collect grit.
- Check that the stem, saddle clamp, axle nuts and rack bolts are tight once a month.
- Wipe salt, sand and mud off the frame and off the battery contacts after riding in them.
- Store the bike dry and bring the battery indoors when the temperature drops below freezing.
What's in the Box
- 1 x HKM-3383507 mid-drive fat tire electric bike, approximately 85-90 percent pre-assembled
- 1 x 48 V 17.5 Ah lithium battery pack (840 Wh)
- 1 x Smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Toolkit with hex wrenches and a pedal spanner
- 1 x Pair of pedals
- 1 x LED headlight with mounting hardware
- 1 x User manual and maintenance schedule
Frequently Asked Questions
What range should I actually expect?+
Plan for 31-37 miles. The low figure reflects throttle-heavy riding on loose or hilly ground; the high figure reflects moderate pedal assist on firm surfaces. Rider weight, tire pressure, headwind and temperature all move the number.
How fast will it go and is that legal where I ride?+
Assist is available to 28 mph (45 km/h). Class rules vary by state and by path operator - many shared paths cap e-bikes at 20 mph. Check local regulations before riding on public ground, and set the display limit lower where required.
How long does a charge take?+
Five to eight hours from empty with the supplied charger. A partial top-up is proportionally quicker, and topping up before the pack is fully flat is better for cycle life than running it to zero every time.
How much does it weigh and can one person lift it?+
Approximately 70 lb with the battery fitted. Removing the pack takes several pounds off. A vehicle rack rated for e-bike weight is recommended over a lightweight trunk-mounted rack.
What maintenance does it need?+
Tire pressure before each ride, brake pad thickness and rotor condition monthly, chain clean and lube every few hundred miles, and a bolt check on the stem, saddle and rack monthly. The motor itself is sealed and needs no internal service.
How much assembly is required?+
It ships roughly 85-90 percent assembled. Fit the front wheel, handlebar, pedals and saddle, check brake alignment and charge the battery fully before the first ride. Budget 30-45 minutes with the supplied tools.
Can it be ridden in the rain?+
Yes, in normal rain. Connectors are sealed and the controller is protected, but the bike is water resistant rather than waterproof - do not pressure-wash it, ride it through deep water or leave it standing outdoors uncovered.
What is the load limit?+
The HKM-3383507 is rated to 330 lb total including rider, clothing and cargo. Exceeding it stresses the frame, wheels and brakes and shortens the life of all three.
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 Tested840 Wh Pack1000 W Motor28 mph Top SpeedHydraulic Disc Brakes330 lb Load
Why Choose the HKM-3383507
Fits a Range of Riders
Saddle and bar adjustment cover a wide rider height band, so the same bike works for more than one person in a household.
Built for Surfaces That Are Not Flat
Gravel, dirt, sand, grass and packed snow are inside the design envelope. The 26 x 4.0 in tires and Front suspension fork with lockout, 100 mm travel carry the load that a road bike frame would simply pass into your wrists.
Climbs Without Drama
With 120 N.m at the crank on tap, grades that would force a downshift and a stand-up effort on an unassisted bike are handled seated.
Range You Can Plan Around
A 31-37 mile band is honest rather than optimistic, which makes route planning something you can actually trust.
Cheap to Run
A full charge of the 840 Wh pack costs a few cents of electricity and replaces short car trips that cost dollars in fuel and parking.
Quiet Running
A brushless drive produces a low hum instead of engine noise, which keeps the bike welcome on shared paths and in early-morning neighbourhoods.
Controls & Indicators
Power Button
Hold the button on the battery or display to switch the system on or off
Assist Buttons
Up and down buttons step through the pedal-assist levels
Thumb Throttle
Right-hand thumb lever, proportional and independent of the pedals
Speedometer
Numeric speed readout in mph on the backlit display
Battery Gauge
Segment indicator showing remaining pack charge
Light Switch
Long-press the up button to toggle the LED headlight and tail light
Shifter
Handlebar shifter for the 7-Speed Shimano drivetrain
Pre-Ride Safety Checklist
- Confirm the battery is locked into its cradle and the display shows the charge you expect.
- Set tire pressure to the range printed on the 26 x 4.0 in sidewall.
- Check both brakes at walking pace before entering traffic or a trail.
- Confirm the quick-release levers on the wheels and seat post are closed and tight.
- Test the throttle briefly in a clear space so you know how sharply it responds today.
- Check the headlight and tail light if there is any chance of riding at dusk.
- Put a helmet on. At 28 mph the consequences of a fall are not bicycle-speed consequences.
Quick Troubleshooting
The motor does not engage at all.+
Confirm the battery is switched on, seated and locked, and that the display powers up. Check the brake-lever cut-off switches - a sticking switch tells the controller you are braking and suppresses assist. Then check the main connector behind the battery cradle.
Range is well below the 31 mile figure.+
Check tire pressure first; it is the single largest controllable factor. Then consider assist level, rider and cargo weight, headwind, gradient and temperature. A pack that has lost capacity permanently will also charge noticeably faster than when it was new.
The motor cuts out under load and recovers after a few minutes.+
That is thermal or over-current protection. Ease off, drop to a lower gear so the drivetrain does more of the work on the climb, and let the system cool for ten minutes before continuing.
Braking feels soft or the lever pulls to the grip.+
For hydraulic disc, 180 mm rotors, check pad wear and rotor condition first. Cable systems usually need a barrel adjuster turn; hydraulic systems that stay soft after pad replacement need bleeding.
The drivetrain skips or will not hold a gear.+
Index the 7-Speed Shimano with the barrel adjuster at the shifter, a quarter turn at a time, while the wheel is turning. Persistent skipping under power usually means a worn chain or cassette rather than an adjustment fault.
The display shows an error code.+
Power the system off, wait 30 seconds and restart. If the code returns, write down the exact code and what you were doing when it appeared, then contact support - the code identifies which subsystem reported the fault.
Certifications & Standards
The HKM-3383507 is produced in an ISO 9001 certified facility. The lithium pack carries UN38.3 transport certification, which is required for lithium-ion cells to be shipped and sold.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Lithium battery transport safety testing.
- ISO 9001 - Quality management certification held by the manufacturing facility.
Important Safety Notes
The HKM-3383507 assists to 28 mph and weighs approximately 70 lb. Treat it as a powered vehicle: braking distances, cornering loads and the consequences of a fall are all greater than on an unassisted bicycle of the same shape.
- Wear a helmet on every ride, and eye protection off pavement.
- Do not exceed the 330 lb total load rating including rider and cargo.
- Check brakes, tires and quick-release levers before every ride.
- Charge indoors with the supplied charger only, on a hard non-flammable surface and not while you are asleep or away from home.
- Do not modify the controller, remove speed limits or fit a non-matching battery.
- Reduce speed on sand, gravel, wet leaves and snow. Traction aids do not remove the risk of losing grip on loose ground.
- Stop riding and have the bike inspected if the frame, fork or a wheel is damaged in a fall or impact.
HKM-3383507 · 1000 W mid-drive central motor · 48 V 17.5 Ah lithium (840 Wh) · 28 mph top speed · 31-37 mi range · 26 x 4.0 in tires · aluminum alloy frame · Hydraulic disc, 180 mm rotors · 330 lb load · approximately 70 lb vehicle weight. Specifications are provided for reference; actual performance varies with rider weight, cargo, terrain, tire pressure, temperature and riding style. Confirm local e-bike class rules before riding on public roads or shared paths.
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