A central bearing built to outlast the frame. BB ALPHA features hand-built, hardened stainless steel races with Grade 3 silicon nitride balls, custom-designed seals, and precision dust covers, offering up to 500% better moisture protection while ensuring ultra-low friction performance. The simplified spacer tube design and lighter cartridges ensure quick installation and a 10% weight reduction over previous generations. All CeramicSpeed BB ALPHA models are covered by a lifetime warranty. Precisely match an SRAM DUB crank with a 28.99mm spindle to a 42mm inner diameter, 68mm width press-fit shell, commonly referred to as BB30, by selecting this high-quality CeramicSpeed bottom bracket. In the box: BB ALPHA for BB30 SRAM DUB Road UFO TECH Grease for bearings All Round 5 ml Adhesive