ENM 407620166 BB 68MM 100MM 120MM TONGSHENG TSDZ2 TSDZ2B Mid Drive Motor Kit 36V 48V 52V Torque Sensor Central Engine Ebike DIY Conversion Kit
[Standard Universal]-- Fits most standard bike with 68-73mm bottom bracket, only fit for the bike with disc brake and chain drive system. [Torque Sensor]-- The smart torque sensor can accurately detect the force on your foot and convert it into kinetic energy in time, with excellent starting performance. You can feel the power of starting the bike from your feet. It is to be the perfect combination of man and machine. [Independent Controller]-- Compact modular design, Synthetic step frequency sensor, outer shell, water-proofing glue, no intermediate connector for higher reliability. [Safe Design]--The power output is synchronized with the pedal, as long as the driver releases the pedal, the power will be cut off immediately, and there is no need to install the brake levers. When the crank is idle, the motor does not rotate. It's as safe as a bicycle..syi