Shimano BB-MT800 Bottom Bracket XT Press-Fit 41mm Size:41mm Compatible with carbon seat rails

Compatible with carbon seat rails  7 x 9mm

Because this product supports muscle and nerve function

Includes: Return Spring & Safety Pin

Improved grip and confidence on choppy surfaces and descents

Shimano BB-MT800 Bottom Bracket XT Press-Fit 41mm Size:41mm Compatible with carbon seat railsPress Fit BB use 24 mm axle and bearings, because 24 mm diameter axle and bearings offers the best balance of rotating performance, stiffness, strength, sealing, weight, for press Fit type as well. Using smaller, lighter bearings and a seal system proven on both XTR and road groups, the new bottom bracket reduces weight and bearing drag while improving mud durability. In short, less weight and increased rotational efficiency results in a faster DEORE