Shimano Press Fit Bottom Bracket Hollowtech II SM-BB91-42A

High-quality Pressfit bottom bracket cups at XTR-level. The new bottom bracket design features low overall weight, low Q-factor and increased heel clearance. Easy to install, increased durability because of the larger bearing size. Pressfit 91 bottom bracket cups can be used with specific frames (bottom bracket size 91x42mm) for this new oversize BB standard only. All Shimano Hollowtech-II cranksets with integrated 24mm spindle are compatible with this bottom bracket