- Inner Diameter：54mm
- Fit 420 chain
- imension:Outside diameter 9-3/4",inside diameter（bore）2-1/8",mounting hole 3/8",center-to-center measurements for bolt pattern please refer to picture.
- Compatibility:60 tooth count and the pitch is 1/2",work with 40/420 Chain for go cart and mini bike.Coleman CT200U BT200X CT200
