This front sprocket is used on the Chinese 200cc engines, specifically the Coleman CT200U mini bike. May be used on other applications as well. This sprocket has 10T and is compatible with the 420 chain ONLY.

Front Sprocket details:

Small and large chain sprocket on the CT200U

Chain Pitch: #420

10T and 20T 

ID 17mm [.66"]

Uses 5x5x28 key Not included

Rear Sprocket :

50 Teeth

Center hole diameter: 40mm [1.56"]

Mounting holes: 57mm [2.23"] apart center to center [side by side]

Mounting holes: 80mm [3.15"] apart straight across

Overall diameter: 20.9cm [8.25"]

Be sure to measure your chain or current sprocket before ordering. 420 chain has 1/2" pitch and 5/16" roller diameter. Most Chinese sprockets have the chain size and teeth count stamped into the metal.

Package includes : 1x 420 chain 140 links + 1x 50T rear sprocket + 1x 20T large front sprocket + 1x 10T small front sprocket