Specification: Length: 759 mm; Top Width: 20.1 mm; Groove Angle: 30 degree Application: GY6 125cc 150cc engine, 152QMI 157QMJ Short-Case scooters, moped, GO-Karts, and ATVs and other Chinese scooters and motorcycles. It can be used on the ATV or Scooter which using the GY6 125/150 short Case engine which the standard belt sizes is 743/20/30 and this one is longer will increase the top speed and torque.