SRAM DUB Pressfit MTB Bottom BracketThe SRAM DUB Bottom Bracket  interface is the single, unified replacement for 30mm and 24mm crank spindle  systems. The DUB system uses 28.99mm crankset spindle/inner bearing diameter  and reaps the benefits of BB30 lightweight bearings and strong crank spindle  with the advantage of the 24mm bottom bracket systems durability.Precise Bottom Bracket, Spindle and Bearing EngagementThe precise bottom bracket,  spindle and bearing engagement is the foundation of DUB technology. This superb  merger creates the ultimate in stiffness, reliability and performance without  sacrificing weight. SRAM have set a new standard for drivetrain performance,  adjustability and reliability by creating a system that is not complicated to  set up and fine-tune; meaning everyone can have the highest levels of  performance, without the need to spend hours in the workshop/garage.Features:  Material: Steel  Compatible Frame Standard: Press-Fit 86mm, 92mm, 121mm  Compatible Crankset Standard: SRAM DUB only  Weight: 71g (PF92)Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.