SRAM DUB Press Fit 30 Ceramic Bottom Bracket Singular Focus, Better Solution The bottom bracket is the piece that connects your crankset to your frame. With an upgraded bottom bracket, you'll have much smoother pedaling. The SRAM DUB Press Fit 30 Ceramic Bottom Bracket has sealed cartridge ceramic bearings that roll incredibly smooth. It is designed to work specifically with SRAM DUB spindles. Features Available in several BB-frame interfaces: BB386, BB386 (Road: 86. 5mm), PF30, PF30 (100mm), PF30 (68), PF30 (68-73mm), PF30 (68or73mmor BBRight), PF30 (73mm), PF30 (79-83mmor BBRight), PF30 (83mm), PF30 (MTB Ai: 83-A mm), PF30 (Road Ai: 83-A mm), PF30 (Road BBRight: 79/83mm), PF30 (Road: 73mm)Sealed cartridge ceramic bearings that roll incredibly smooth Designed to work with SRAM DUB spindles Chainline: 55mm | Sram | Dub Pressfit 30 Ceramic Bottom Bracket Road