Fit GY6 49cc 50cc 139QMA 139QMB EngineV Dirt Bike Scooter Moped like Taotao Jmstar Jonway Roketa. Racing GY6 50CC Clutch Shoe. When the RPM increases, the friction between clutch shoe and driven plate will be increased to transmit greater torque Overall Outer Diameter: 105mm | Inner Hole(mm): 24*28 | Clutch Springs: 2000RPM Package Content:1PC Clutch Shoe. Please Check The Pictures Carefully Before Your Purchase Please feel free to contact us if you have any question, we will reply within 24 hours. Product Description Fit Most of Chinese gy6 50cc Dirt bike Scooters Gokart and ATVs,fit 139QMA 139QMB Engine.