BB30 Press Fit Bottom Bracket For BB30 68/73mm 42mm Frame Shell For 24mm Spindle Crankset For 22/24mm GXP Spindle Crankset(use GXP adapter together) For 29mm DUB Spindle Crankset For 30mm Spindle Crankset Thread lock system compatibility Eliminates creaking of traditional press fit bottom brackets. Steel and Ceramic Bearings Available Ceramic version bottom brackets bearing ball made of ceramic material, smooth and light weight, makes it solid and durable with a long service time. (Ceramic bearing is steel track and ceramic ball) Notes: bearing color in random GXP compatible For 22/24mm GXP Spindle Crankset if you have a GXP crankset, please choose GXP version Light weight each models have a little floating difference, the weight is for reference only Each of our bottom bracket are manufactured for best performance and longest durability.Matching top quality components and know-how, we make sure that every bottom bracket empowers every rider with opportunities to save energy or ride faster. The special design of the threaded bottom bracket, where the cups are threaded and screwed together inside the frame, ensure that you avoid any creaking sounds .