Outer Diameter (pulley): 118mm
Outer Diameter (clutch bell): 115mm
Inner Diameter (clutch bell): 107mm
Inner Diameter (clutch): 12mm
Outer Diameter (shoes): 104mm
Uses 6901-RS bearing
Clutch Bell Inner Diameter (splines peak to peak): 11mm
Number of Splines (clutch bell): 22

GY6 50cc Clutch Assembly for 139qmb 139qma engine.

GY6 50CC Clutch with clutch bell for 50cc 4-stroke QMB139 engines.Various unlisted makes/models, Tank, SUNL, Roketa, Baja SC50, Schwinn, QMB139 50cc/49cc , Panterra, Kymco