motor138Buy Mid Drive Motor Kit Electric Bike Conversion QS-MOTOR138 4000W 90H 7500W Max Continuous 72V 120KPH Mid Drive Motor Conversion Kit With Wire Harness EM200-2SPMOTOR138 QS PMSM 4KW 90H V3 Mid Drive Motor With Internal Gearbox With 12.35 Reduction Ratio Inside, with 6500-7000rpm.. Application: e.g. Dirt bike. E-motorcycle