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- 51 tooth splined engine rear sprocket is nickel plated
- WR-KR-XR sprockets have a .350" offset from the center of the spline to the center of the tooth profile
- This is 8 tooth spline and 9.9mm at the widest point on spline
- V-Twin's KR-XL-WR sprockets can be used with 530 wide chains
- 530 chain sprockets has splines to fit WR-XR-KR quick change hub
- (WR and JD splines do not interchange)
- Fits:
- RL 1930-1937
- KR 1952-1956
- XR 1970-1980