Components Compatible with Fiido M21 Fat Tire

The Fiido M21 is a folding fat-tire electric bike with a 500W rear hub motor and a built-in torque sensor for natural pedal-assist response. It runs a 48V 11.6Ah (556.8Wh) battery, 20"x4" fat tires, a 7-speed derailleur, and a hydraulic coil-sprung front fork, with a folding aluminum-alloy frame for storage and transport.