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BSA Bottom Bracket Includes Enduro Silicone dust seals ABEC-3 sealed bearings Grade 10 chromium steel balls, 52100 high carbon chromium alloy races Replaceable Enduro bearings Made in the USA Wheels Manufacturing BSA Bottom Bracket - Shimano Road, ABEC-3 Bearings, Black Cups Spindle Interface Type: Shimano Hollowtech II Bottom Bracket Shell I.D.: 1.37 BB Shell Width (mm): 68 Defined Color: Black BB/Frame Interface: English Show more