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 threaded T47 frame that is 85-86mm wide with bearings placed inboard by selecting this high quality bottom bracket from CeramicSpeed.