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 20T and is compatible with the 420 chain ONLY.

Sprocket details:

Large chain sprocket on the CT200U

Chain Pitch: #420

20T

ID 17mm [.66"]

OD 86mm [3.38"]

Uses 5x5x28 key Not included

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.