- Size 530
- Made to OEM specs w/hardened steel
- Excellent replacement for stock units NOTE: If you own a 79 model with the 630 chain/sprocket setup and wish to upgrade to the later, better 530 setup, this 18 tooth front sprocket along with a 42 tooth 530 rear sprocket (and 530 chain) will give you the same gearing as the original 15/35 with 630 chain setup.