12 Tooth 428 Pit Bike Front Sprocket (20mm)

This is a new item. 12 tooth for use with 428 chain. 20mm 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