The SRAM GXP Team bottom bracket is designed for both SRAM mountain bike and road drivetrains, delivering flawless performance at an inexpensive price. The cartridge bearings use gutter seal technology to keep the elements out and the grease in for significantly increased longevity over previous incarnations. SRAM's new Gutter Seal system takes a two stage approach in directing contaminates away from the bearings providing longer bearing life. GXP s Gutter Seal design also reduces friction, 35% less drag than the current GXP BB, improving rider feel and performance. Gutter Seal system has deeper installation tool grooves which provide stability and support while applying torque to the adapter cups. The new GXP bearings feature Gutter Seal Technology drastically improving sealing against the elements while reducing seal drag. SRAM have designed a fresh cup forging for a high-end look. A new standard in external bearing performance. Available for various shell widths and thread standards. Suitable for 24mm spindle / 51mm chainline SRAM GXP interface cranks only. The box contains sealed cartridge bearings, threaded cups, center tube and spacers. Requires a 16 notch BB Installation tool. For best results, have your frame faced by a professional bicycle mechanic.