SRAM GXP Bottom Bracket Spinning All Day Whether you're building up a fresh bike or you're replacing your worn-out bottom bracket, make sure you get the best parts to get the job done. The SRAM GXP Bottom Bracket is made with Gutter Seal Technology that drastically improves sealing against the elements while reducing seal drag. They also feature improved tool engagement and a 24mm spindle diameter. Features Gutter Seal Technology drastically improves sealing against the elements GXP Gutter Seal Design reduces friction Improved tool engagement for easy installation and removal | Truvativ | Sram Gxp Bottom Bracket English, 83Mm, Gxp