RD PULLEY KIT SRAM XX1 X-Sync 11speed BlackBox Ceramic Hybrid Bearing

SRAM is a US bicycle drivetrain and brake manufacturer founded in 1987. SRAM introduced many features now considered standard — grip shifters, 1× drivetrains for mountain bikes and wireless electronic shifting (AXS). SRAM also owns the RockShox, Avid and Truvativ brands.