HKM-717715 20" Foldable Electric Fatbike · 48V 13Ah · 500W

Unleash the freedom to roam. A rugged, foldable electric fat tire bike engineered for adventure, daily commutes, and everything in between.

Technical Specifications

• Top Speed: 18.6 – 31 mph (30 – 50 km/h)
• Range per Charge: 19.3 – 37.3 miles (31 – 60 km)
• Battery: 48V 13Ah Lithium-ion (624Wh)
• Motor: 500W Brushless Rear Hub, 48V
• Tires: 20" x 4.0" All-Terrain Fat
• Charging Time: 3 – 4 hours
• Gears: 7-Speed Shimano Derailleur
• Brakes: Front & Rear Mechanical Disc
• Frame: 6061 Aluminum Alloy, Foldable
• Folded Size (approx): 35.4 x 20.1 x 28.3 in (90 x 51 x 72 cm)
• Max Load: 300 lbs (136 kg)
• Net Weight: Approx. 62 lbs (28 kg)

Motor & Performance

The heart of the HKM-717715 is a 500W brushless rear hub motor that delivers instant torque with every pedal stroke or throttle twist. Engineered for efficiency, it maintains a smooth power curve across the entire speed range. Whether accelerating from a standstill on a city street or climbing a steep dirt incline, the motor provides consistent pull without overheating. The brushless design minimizes maintenance while maximizing longevity. With pedal assist and throttle-on-demand modes, you decide how much effort to invest — from a leisurely cruise to a full-electric ride.

Paired with a smart controller, the motor response is refined: no jerky starts, just seamless propulsion. The bike reaches a top speed of up to 31 mph (50 km/h) depending on terrain, rider weight, and assist level. That's more than enough to keep pace with urban traffic or to enjoy an exhilarating off-road sprint.

Battery & Range

At the core of the long-distance capability lies a 48V 13Ah lithium-ion battery, storing 624 watt-hours of energy. The cell pack uses high-density 21700 cells, known for their balance of weight and capacity. A full charge yields an estimated 19.3 to 37.3 miles (31 to 60 km) on a single charge, varying with terrain, assist level, and rider input. The removable battery locks securely into the frame and can be charged on or off the bike — convenient for apartment dwellers or office charging.

Charging is swift: an included 3A smart charger refills the battery in approximately 3 to 4 hours. The battery management system (BMS) actively monitors temperature, voltage, and current to prevent overcharging and extend cell life. Expect hundreds of charge cycles before any noticeable capacity fade.

Frame & Folding Mechanism

The backbone of this fatbike is a 6061 aluminum alloy frame — a material prized for its high strength-to-weight ratio. It resists corrosion and absorbs trail vibrations, offering a compliant yet sturdy ride. The folding mechanism is located at the center of the frame and on the stem, allowing the bike to collapse in seconds without tools. Once folded, the approximate dimensions shrink to 35.4 x 20.1 x 28.3 inches (90 x 51 x 72 cm), fitting into car trunks, RV storage bays, or under office desks.

Despite its folding capability, the frame exhibits no flex under load. The hinge uses a heavy-duty clamp with a safety lock, and the entire structure is rated for a maximum payload of 300 lbs (136 kg). The frame geometry places the rider in an upright, comfortable position, reducing fatigue on longer journeys.

Tires & Suspension

Rolling on 20-inch by 4.0-inch fat tires, the HKM-717715 floats over surfaces that would stop a standard bike. The large air volume naturally absorbs bumps, acting as passive suspension. The aggressive tread pattern provides grip on loose gravel, packed sand, light snow, and muddy trails. Yet on pavement, the tires roll efficiently with a low hum. The 20-inch diameter strikes a balance between nimble handling and rollover ability, while the extra width gives a planted, confident feel.

While the bike relies on tire compliance rather than a dedicated suspension fork, the fat tires at low pressures (15-25 PSI) offer significant shock absorption. Riders can fine-tune pressure for softness or efficiency, adapting to the day's terrain.

Drivetrain & Brakes

Shifting is handled by a 7-speed Shimano rear derailleur with a thumb shifter, giving a wide enough gear range for steep climbs and fast flats. The chain and freewheel are robust, designed to cope with the additional torque of the electric motor. The gear indexing is crisp, requiring minimal adjustment over time.

Stopping power comes from front and rear mechanical disc brakes with 160mm rotors. They provide consistent bite in wet or dry conditions, and the mechanical actuation means easy roadside adjustments without special tools. The brake levers are ergonomic, featuring a motor cutoff sensor that instantly disengages power when braking — a vital safety feature.

Rider Interface & Electronics

The backlit LCD display mounted on the center of the handlebar shows current speed, trip distance, odometer, battery charge level, pedal assist level (0-5), and voltage. It's readable in direct sunlight and automatically dims at night. Controls are intuitive: power button, mode select, and a thumb throttle on the left grip for full-electric acceleration. A USB port on the display allows charging of small devices on the go, like a phone or GPS unit.

Integrated front and rear LED lights ensure visibility after dark. The headlight projects a wide beam, while the rear light functions as a running light and brake light, increasing conspicuity in traffic.

Why Choose the HKM-717715?

Ride Experience

From the moment you sit on the HKM-717715, the wide saddle and swept-back handlebars create a relaxed posture. The fat tires smooth out cracked pavement, potholes, and gravel paths, while the motor's torque makes quick work of uphill sections. The bike feels surprisingly nimble for its size, thanks to the 20-inch wheels. In electric mode, you can cover long commutes without breaking a sweat; with pedal assist level 1 or 2, you still get a light workout while extending the range even further. The throttle allows you to start from a standstill without pedaling — handy at traffic lights or on loose surfaces.

Versatility in Every Ride

This e-bike suits a wide range of lifestyles. Urban commuters appreciate the foldability for multi-modal trips (bus or train) and the ability to park under a desk. Outdoor enthusiasts can explore forest trails, fire roads, and sandy beaches that are off-limits to conventional bikes. RV and boat owners value the compact storage and freedom to explore port towns or campsites. Even on the daily grocery run, the optional rear rack (sold separately) can carry panniers or a cargo net, turning the bike into a capable utility vehicle.

Frequently Asked Questions

Our Commitment to You

Designed with precision. Built for adventure. Ride beyond.