Shimano Hollowtech 2. Bottom Bracket Bearings 2RS. --- 25 X 37 X 7mm ---. OEM spec 2RS bearings. Each Hybrid Ceramic 2RS. with high quality grease. silicone nitride ( ceramic Si3N4 ). bearing contains.
Pre load crank arm bolt cap M20 Shimano Hollowtech 2 Crank M20
