Designed by our French Engineers NOVA CARBONE Ceramic rear derailleur improves the fluidity of your transmission, enhance efficiency to satisfy the most demanding. Made in very high-end materials: an ultra-light carbon fiber and ceramic bearings. Two Oversized aluminum wheels, which coupled with ceramic bearings decrease the chain winding angle with minimal friction In this version, OSPW is compatible with SRAM AXS 12S RED/FORCE rear derailleur and SRAM AXS 12S RED/FORCE ETAP.