Fat-Tire Electric Mountain Bike
HKM-3413571 Fat-Tire Electric Mountain Bike
The HKM-3413571 is a 26 in fat-tire electric mountain bike built for pavement, park paths, and light trails. A 400 W brushless rear hub motor and a 36 V 13 Ah lithium battery move you up to 25 mph, while dual suspension and 21 gears smooth out the rough stuff. Mechanical dual disc brakes and an LCD display keep speed and range where you want them on the commute and beyond.
26 in Fat Tire400 W Rear Hub Motor36 V 13 Ah Battery25 mph Top SpeedDual Suspension21-Speed DrivetrainDual Disc Brakes330 lb Load
Motor
400 W
Brushless rear hub
Battery
36 V 13 Ah
Removable lithium
Top Speed
25 mph
40 km/h
Tires
26 in
Fat-tire, 1.95 in
Suspension
Dual
Front & rear
Range
25-40 mi
Pedal-assist mode
Overview
The HKM-3413571 pairs a 400 W brushless rear hub motor with a 36 V 13 Ah lithium battery in a carbon-steel mountain frame. The result is a confident, do-most-things electric bike that climbs city grades, rolls over park paths, and keeps up with traffic at up to 25 mph.
Fat 26 in tires and dual suspension (front and rear) take the sting out of potholes, curbs, and gravel, while a 21-speed thumb shifter lets you find the right gear for every hill. Mechanical dual disc brakes bring both wheels to a steady stop.
An LCD display shows speed and battery at a glance, and a 330 lb load rating covers rider plus rack cargo. Whether it is a weekday commute or a weekend trail, the HKM-3413571 is ready to ride.
Key Features
400 W Brushless Rear Hub Motor
A brushless rear hub motor drives the wheel with quiet, low-maintenance power. Use the throttle for a no-pedal cruise or pedal assist to lengthen the ride, and switch between them on the handlebar.
26 in Fat Tires for Rough Ground
Wide 26 x 1.95 in fat tires float over potholes, gravel, and packed dirt that would rattle a road bike. More rubber on the ground means steadier handling and a calmer ride on broken pavement.
Dual Suspension, Front and Rear
A suspension fork up front and a rear shock absorb bumps before they reach your hands and seat. The bike stays composed on curbs, trails, and rough city streets.
Mechanical Dual Disc Brakes
Disc brakes at both wheels give repeatable stopping power in wet and dry conditions. Mechanical calipers are easy to adjust and service, which keeps the bike on the road.
Carbon Steel Frame, 330 lb Load
A carbon-steel mountain frame is built to carry up to 330 lb of rider and cargo. The geometry is stable at speed and relaxed for daily commuting.
Mountain, City & Commute in One
From the bike lane to the park loop to a light trail, the HKM-3413571 handles the trips most riders actually make, not just the weekend epic.
Full Specifications
Model
HKM-3413571 | Fat-Tire Electric Mountain Bike
Motor
400 W brushless rear hub
Battery
36 V 13 Ah lithium (removable, frame)
Tire Size
26 x 1.95 in fat tire
Brakes
Mechanical dual disc
Suspension
Dual (front + rear)
Gears
21-speed, thumb shifter
Frame
Carbon steel
Display
LCD
Max Load
330 lb
Net Weight
58 lb
Range
18-23 mi throttle / 25-40 mi PAS
Top Speed
25 mph
Warranty
1 year
Daily Use & Care
- Wipe the frame and tires after wet or dusty rides to keep rust and grit away.
- Keep both tire pressures even for stable, predictable handling.
- Charge the battery after a heavy day of riding so the bike is ready next time.
- Clean and lightly lubricate the chain every few weeks of regular use.
- Inspect the disc brakes monthly and replace pads when the friction material is thin.
- Store the bike in a dry place and keep the battery between charges in a cool, dry spot.
Frequently Asked Questions
How fast does the HKM-3413571 go?+
The brushless rear hub motor reaches up to 25 mph (40 km/h) in throttle or assist mode, depending on rider weight, terrain, and charge.
What is the real-world range?+
Expect 18-23 mi on throttle alone and 25-40 mi with pedal assist. Hills, cargo, and assist level all shift the number.
Does it need assembly?+
Yes. The bike ships partly assembled; you typically fit the front wheel, handlebar, pedals, and seat, then check the brakes and gears before the first ride.
How much can it carry?+
The carbon-steel frame is rated for up to 330 lb (150 kg) of combined rider and cargo, enough for a commuter plus a rack load.
What size are the tires?+
They are 26 x 1.95 in fat tires, chosen for stability and comfort on pavement, paths, and light trails.
What does the warranty cover?+
A 1-year warranty covers the frame and core electrical components, with claims supported by photos or video of the fault.
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.
400 W Motor26 in Fat TireDual Suspension21-SpeedDual Disc Brakes330 lb Load
Why Choose the HKM-3413571
Electric, Low-Maintenance Hub Motor
The motor sits in the rear hub with no chain to oil beyond the drivetrain. Fewer exposed parts means less routine care and fewer roadside surprises.
Rated for 330 lb of Rider and Cargo
The carbon-steel frame carries up to 330 lb (150 kg) of combined rider and luggage, enough for a commuter plus panniers or a backpack.
21 Speeds for Every Hill
A thumb shifter moves through 21 gears so you can spin easy on climbs and push a taller gear on the flat. Pedal assist adds power when the gradient bites.
Real-World Range on a Single Charge
Ride 18-23 mi on throttle alone or stretch to 25-40 mi with pedal assist, so most weekday trips need no midday top-up.
Confident Dual Disc Brakes
Disc brakes stop both wheels predictably in rain or shine, which matters on a heavier e-bike at city speed.
Backed by a 1-Year Warranty
A 1-year warranty covers the frame and core electrical parts, giving you a clear path if something goes wrong in the first year.
Controls & Indicators
Power Button
Press and hold to switch the system on or off before each ride.
Mode / Assist Buttons
Use the display buttons to set throttle or pedal-assist level.
LCD Display
Shows speed and battery so you always know the bike state.
Twist Throttle
The right-grip throttle adds power on demand in throttle mode.
Battery Indicator
The display shows charge level so you can plan the ride around a top-up.
Pre-Ride Safety Checklist
- Confirm the power is on and the LCD shows the expected mode and charge before you set off.
- Squeeze both brake levers to check they engage firmly with no sponginess.
- Shift through the gears to confirm the thumb shifter moves cleanly.
- Check tire pressure and look for cuts or low spots on both tires.
- Test the throttle at walking pace in a clear area before riding in traffic.
- Make sure the seat and handlebar are clamped tight before riding.
Quick Troubleshooting
The motor does not engage when I use the throttle.+
Check that the power is on, the display shows charge, and the mode allows throttle. Confirm both brake levers are released, since many systems cut power while a brake is held.
The bike feels rough over bumps.+
Check tire pressure first; low fat tires transmit more shock. Then confirm the suspension is not locked out and the preload is set for your weight.
The brakes feel weak or uneven.+
Disc brakes need a clean, true rotor. Wipe the rotors, check the pads have material left, and have the system serviced if stopping power drops.
The chain skips or the gears will not engage.+
Adjust the thumb shifter indexing and check the derailleur hanger is not bent. A clean, lightly lubricated chain shifts more reliably.
The battery runs out faster than expected.+
Throttle-only riding and high assist use more energy than pedaling. Charge after heavy days and keep the pack topped up for the next trip.
The display flickers or goes blank.+
Check the battery connection and the display cable at the handlebar. A loose plug or low charge can drop the screen; reseat and recharge before riding.
Important Safety Notes
The HKM-3413571 is a powered bicycle. Read the manual before the first ride and practice in a quiet area until you are comfortable with the throttle, the brakes, and the gears.
- Always wear a helmet, and bright or reflective clothing in low light.
- Keep speed within the limit for paths and traffic, and slow early for corners.
- Charge and store the bike in a dry, room-temperature place.
- Check the brakes, tires, and gears before every ride.
HKM-3413571 · 26 in fat-tire electric mountain bike · 400 W rear hub motor · 36 V 13 Ah battery · 25 mph · dual suspension · 21-speed · dual disc brakes · 330 lb load
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