Fiido M21 Fat Tire Electric Bike With Torque Sensor

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500W Rear Hub Brushless Motor w/ Torque Sensor

48V/11.6Ah Frame Integrated Lithium-Ion Removable Battery

20" x 4.0" All-Terrain Fat Tires


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Fiido M21 Description

The Fiido M21 is a portable full-suspension fat tire folding electric bike, perfect for your off-road adventures. The M21 has a folding mechanism at the center of the frame, and another at the base of the tiller, giving the bike a compact folded dimension of 39.7” x 20” x 30.3”. This makes it perfect for RV campers and anyone else with limited storage space.

Don't let its small folded size fool you. The Fiido M21 is a powerful and versatile electric bike, featuring a 500W rear hub motor paired with a 48V/11.6Ah battery. This will give you hours of riding excitement with every charge. You can operate the power system by engaging the 3-level pedal assist system (PAS), which will give you a boost while pedaling. You can use pedal assist while shifting through the 7-speed Shimano gears, giving you the ability to find the sweet spot in every riding condition. However, if you need a break from pedaling, you can just give the right-side thumb throttle a push, and off you go, no pedaling required. 

Accurate Torque Sensor

The newly added torque sensor assesses the force put into the pedals, creating a significant improvement that achieves low latency, accuracy, and low maintenance. This addition improves the handling of the bike, making it much more intuitive and enjoyable to ride, while also making it safer.


fiido m21 outdoors with rider

500W Strong Motor

A powerful 500W motor comes paired with a wide-range 7-speed derailleur that allows the M21 to reach a top speed of 40 km/h, providing the assistance needed to reach your destination promptly regardless of terrain and weather conditions. Moreover, the 7-speed seamless shift fully achieves freewheeling control. For EN certification, the motor is identified as 250W.


fiido m21 torque sensor

20" X 4.0" Off-Road Fat Tire

The 20" x 4" wheels and ultra-wide rims mesh with the all-terrain fat tires and anti-skid tread pattern design to help you easily traverse the jungle, sand, rocky beaches, puddles, and other daunting terrains.


fiido m21 outdoor

Hydraulic Coil Sprung Fork

The suspension fork eliminates bumps through the front wheel, making the most difficult trails feel more comfortable. The high performance of the M21’s coil-sprung fork increases rider control in especially rough terrain, guaranteeing safer and smoother cycling.


fiido m21 fat tires

500 Times Rechargeable Battery

The high-torque 48V battery can achieve rapid acceleration and a maximum range of 100KM on an 11.6Ah fully-charged capacity, enabling you to travel long distances with ease. Taking only 7 hours to fully charge, the 500 cycles of rechargeable battery life allows you to venture out again with minimal downtime.

fiido m21 48v/11.6ah battery

Portable Structure

The M21 features an adjustable bicycle body and portable structure with a collapsable size of 39.7” x 20” x 30.3”, making it convenient to carry in the car trunk, on the subway, or even onto the train.

fiido m21 portable folding frame

Fiido M21 Specifications

  • Motor: CZTB 500W Rear Hub Brushless Motor w/ Torque Sensor
  • Battery: 48V/11.6Ah Frame Integrated Lithium-Ion Removable Battery
  • Charge Time: 7 Hours
  • Drive Modes: 7-Speed Shimano Drivetrain w/ 3-Level Pedal Assist System & Thumb Throttle
  • Frame: Aluminum Alloy Frame
  • Suspension: Front Hydraulic Coil Sprung Suspension fork & Rear Shocks
  • Brakes: Mechanical Disc Brakes
  • Tires: 20" x 4.0" All-Terrain Fat Tires
  • Seat Height: 32.6" - 41.7"
  • Chainset: Steel 52 Tooth
  • Chain: KMC Z7
  • Accessories: Fenders, Headlight, Rear Reflector
  • Recommended Ride Height: 5'-0" - 6'-5"
  • Bike Dimensions: 68.8" x 22.8" x 41.7"
  • Folded Dimensions39.7” x 20” x 30.3”
  • Max Speed: 24.8 mph
  • Weight: 55 Lbs
  • Max Load Capacity: 265 Lbs
  • Box Dimensions & Weight: 57.8" x 12.4" x 28.3" (50.7 Lbs.)
  • Box Contents: M21 Ebike, Charger, Adapter, Pedals, Open Spanner, Allen Key, Fenders
  • Assembly: This ebike comes mostly assembled. Final assembly includes attachment of the seat, handlebar and front wheel. See the assembly video below.
  • Tools RequiredOpen Spanner & 1mm - 6mm Hex (Allen) Keys (Included)
  • Warranty: 1-Year
  • Shipping: Free shipping to the lower 48. We cannot ship this brand to Alaska or Hawaii at this time. For shipments to Canada, please email your shipping address to

Fiido M21 User Manual

Fiido M21 Unboxing & Assembly video

Orders for in-stock items take 24-48 hours to process, then about 5-7 days in transit. Delays due to Covid have occurred. If an item is on backorder, the estimated ship date will be shown below the Pre-Order Button.

All products are shipped free within the Contiguous US via UPS, FedEx or similar carrier. Shipping to AK, HI and PR may incur additional charges.

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Returns for buyer’s remorse are typically not accepted by our suppliers, and if accepted, the customer may incur shipping and restocking fees.

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