Shovelhead Sturgis models feature a factory primary belt drive which has rubber dampers integrated into the motor pulley. These are the stock replacement rubbers.

A design, introduced by the factory in 1980 on the Sturgis model, which has a great advantage over solid pulleys. The integrated rubber cushions of the Belt Optimizer pulley are shock compensating and take it easy on your belt when accelerating hard, when riding slow in high gear or when downshifting. This smooth performance will extend the service life of your primary belt and make you feel more comfortable on your twowheeler. Comes with stainless steel guard disc, 46 mm sprocket shaft nut and puller tool.

Genuine Primo sprocket shaft nuts and washers for the front belt pulley.

Hardened steel offset inserts for front Primo belt pulleys. They replace the standard inserts and allow the builder the freedom to offset the primary/transmission for the use of a wider rear wheel and tire assembly.

Special pulley nuts to work with front primary pulleys that have offset inserts.

The main reason for premature belt failure is the misalignment of front and rear pullies. These spacers are designed to be used behind the engine pulley to achieve proper front to rear pulley alignment by using the proper thickness shim.