X12 Chain The KMC X-Series has been designed with the specific characteristics of the Shimano, and Campagnolo systems in mind and will meet the most demanding requirements. Elaborately designed and manufactured, the X-Bridge technology, thanks to precisely chamfered plates, allows a smooth propulsion and perfect gear changes in all driving situations. Key Features Compatible with Shimano, and Campagnolo 12-speed systems Not Compatible with SRAM eTAP and Flattop