Handbuilt for quality reassurance the CeramicSpeed SRAM DUB BSA Mountain Bike Bracket outperforms any rival Featuring an integrated dust cover for all models a snug and secure fit that fully protects the face of the bearing the new SRAM DUB crank standard built on a 2899 spindle allows for a more contamination resistant BB design delivering outstanding performance and stiffness without any sacrifices Without the use of unnecessary adapters or spacers a quiet stable platform is ensured throughout the life of the CeramicSpeed SRAM DUB BSA Mountain Bike Bracket Features highperformance bearings with special ceramic balls made of 3rd degree silicon nitride best achievable degree for ceramic bearingsCeramicSpeed bearing balls 15 harder 100 smoother and 99 more resilient than commercially available ceramic ballsreduced friction smoother running more performance

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