Shimano, SRAM, and Campagnolo systems can all use 14T/16T 4.7mm eccentric pulleys, primarily to replace the original lower pulley, thereby serving as a large pulley. No need to replace the original guide plate swing arm, making installation convenient and saving money. 1. Supports 14T for 8000/6800 & Campagnolo full series. 2. Supports 14/16T for new 105 UT mid-to-long arms and full SRAM series. The function of the large guide pulley is to extend the chain's running length, enabling the drivetrain to operate with larger chainrings, thereby saving output power!
