motor138MOTOR138 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-motorcycleIt’s QS Motor QS Motors. QS motors are available in a wide variety of types and specifications. There are different models such as QS138, QS205, QS273, etc. The power options range from