13 Tooth 420 Pit Bike Front Sprocket (17mm)

This is a new item. 13 tooth for use with 420 chain. 17mm centre spline. SIZE NOTES: Centre Spline can be 17mm or 20mm depending on engine. MOST are 17mm but please check before ordering. Sprocket tooth size guide: 420 chain - Width between inner plates is 6.35mm, roller diameter 7.77mm 428 chain - Width between inner plates is 7.94mm, roller diameter 8.51mm