C-Bear Ceramic aluminium pulley wheels with ceramic bearings for Shimano/SRAM 10/11-speed rear derailleur. The pulley wheels are the fastest spinning bearings on your bike. An upgrade to ceramic bearing therefore is the most effective upgrade.
C-Bear Ceramic Bearings is a Belgian bearing specialist for ceramic ball bearings with excellent running properties and durability. All bottom brackets work without additional spacers and washers.
C-Bear Ceramic Bearings Aluminium Pulley Wheels for Shimano/SRAM 10/11-speed