A bottom bracket built to outlast your frame. BB ALPHA features hardened stainless-steel races hand-built with grade-3 Silicon Nitride ceramic balls, custom-engineered seals and precision dust covers, delivering up to 500% better moisture protection, while still providing ultra-low friction performance. The simplified spacer tube design and lighter cups ensure quick installation and a 10% weight reduction over previous generations. All CeramicSpeed BB ALPHA models are backed by a lifetime warranty.Precisely pair a crankset with a 30mm axle of adequate length with a pressfit 41mm bore that is 92mm wide, commonly referred to as BB92 by selecting this high quality bottom bracket from CeramicSpeed. In the box: BB ALPHA for BB92 30mm MTB UFO Long Life Grease 5 ml Decal