Machined aluminum shell threads together for precise bearing alignment and frame fit, reducing bottom bracket creaking and premature bearing wear. FEATURES: Replaceable Enduro bearings Made in the USA ABEC-3 sealed bearings Grade 10 chromium steel balls, 52100 High Carbon Chromium Alloy Races SPECS: BB Shell Width (mm): 68 mm , 73 mm BB/Frame Interface: BB30 Bottom Bracket Shell I.D.: 42 Weight: 127 g Spindle Interface Type: Shimano Hollowtech II , FSA MegaExo , FSA MegaExo Light , RaceFace EXI