SRAM crankset. CeramicSpeed bottom bracket for threaded frames with external cups and 24/22.2mm SRAM crankset. CeramicSpeed bearings are handmade in Denmark and installed in aluminium cups. CeramicSpeed Bottom Bracket's offer extremely low friction and longer lifetime. The unique CeramicSpeed ceramic balls are of the highest achievable quality and out-perform everything else in the market. Spacers are not necessary for this product and the system is super stiff and efficient. Our Bottom Bracket bearings are used by professional teams like Astana Pro Team, Tinkoff, Team Dimension Data for Qhubeka and ONE Pro Cycling. CeramicSpeed Bottom Brackets will only reach the highest performance and lowest friction if they are mounted correctly. You can use our videos for guidance if you have experience mounting bearings. Otherwise, you should go to your local bike shop to help you with the installation of your new Bottom Brackets. To ensure optimum performance and maximum longevity it is important to maintain your Bottom Brackets correctly. You can get more information by watching our maintenance videos here.