MC03B

       Chain or gear will be broken easily at Mid-motor drive system if system can not cut power on time during gear-changing process .

       Newest In-Line Shift sensor can solve that problem properly, this sensor can be fixed on derailleur cable ,a signal will transfer to system from sensor at gear-changing process , control system cut-off the power according to this signal , the main feature is smaller size ,easily to fix, high sensitivity.