Ceramic Speed

BB ALPHA Mountain Bottom Bracket - T47, 73mm, For 24mm/Shimano Spindle

CeramicSpeed BB ALPHA Mountain Bottom Bracket brings world-class bearing performance and durability to riders who demand maximum efficiency on the trail. Designed for T47 mountain frames with 73mm shells and 24mm Shimano spindles, this bottom bracket delivers ultra-smooth pedaling and exceptional longevity, even in wet and gritty conditions.

Each BB ALPHA is hand-built in Denmark using hardened stainless-steel bearing races paired with grade-3 Silicon Nitride ceramic balls for friction levels far below traditional steel bearings. Custom-engineered light-contact seals and precision dust covers boost moisture protection by up to 500%, keeping contaminants out without increasing drag. The result is a bottom bracket that spins faster, lasts longer, and shrugs off the elements ride after ride.

A simplified spacer tube and lightweight 7075 aluminum cups reduce weight and make installation straightforward, while updated internal bearing support improves load handling and long-term reliability. This is a bottom bracket built for riders who want performance that endures far beyond typical component lifespan.

• Fits T47 mountain frames (73mm shell) and 24mm Shimano spindles
• Hand-built bearings with hardened stainless-steel races and grade-3 Silicon Nitride ceramic balls
• Up to 500% better moisture protection with custom light-contact seals and precision dust covers
• Improved internal bearing support for better preload handling and long-term durability
• 10% lighter than previous generations with 7075 aluminum cups
• Made and assembled by hand in Denmark, backed by a lifetime warranty