GXP bottom brackets for SRAM and Truvativ GXP integrated spindle cranksRequired installation tools: torque wrench, 8mm hex key, and Truvativ GXP bottom bracket tool (TL2342) or equivalentGiga X Pipe (GXP)- An external bearing system with 3D forged, heat treated and CNC'd 24mm OD CroMoly spindle integrated with right crank arm; custom cartridge bearings with eight seals and CNC'd alloy cupsItem SpecificationsWeight118gBB/Frame InterfaceEnglishSpindle Interface TypeTruVativ GXPBB Shell Width83mmDefined ColorSilver SRAM Threaded Bottom Brackets Bottom Brackets UPC: 710845657108