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 : Spindle Interface Type: SRAM/Truvativ GXP BB Shell Width (mm): 86 , 92 Bottom Bracket Shell I.D.: 41 BB/Frame Interface: BB86 , BB92 Defined Color: Black Weight: 100