motor138It’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 fromBuy Mid Drive Motor Kit Electric Bike Conversion QS-MOTOR138 4000W 90H 7500W Max Continuous 72V 120KPH Mid Drive Motor Conversion Kit With Wire Harness EM200-2SP