This TSDZ2 mid-drive motor, which is compatible with a 68mm bottom bracket, has a rated power of 250W and 350W, a maximum torque of 80 N.m, a torque sensor and speed sensor,will provide the rider with great explosive force when starting the system. Highly strong and efficient, this TSDZ2 mid motor greatly enhances riding joy and is suitable for mountain bikes and sand bikes which are the favorites of riders who love challenges as well as transport bikes.