Outer Diameter(pulley):119mm/4.68",outer Diameter(clutch bell):115mm/4.52". Inner Diameter(clutch bell):107mm/4.21";Inner Diameter(clutch):12mm/0.47". Replacement for all GY6 49cc 50cc Chinese brand like Roketa Sunl Kazuma Jonway Redcat Eagle Xtreme Yiben SSR,Not replacement for taotao 50cc.. Not suitable for models:1984 50cc.
