e*thirteen BSA Theaded Bottom Bracket - 83mm, For all e*thirteen Base Cranks with 24mm Spindle, Blacke*thirteen Threaded Bottom Brackets Bearings feature high performance seals and custom grease specification for top notch durability and smooth spinning e*thirteen threaded BBs cannot be used to retrofit a BB30 crankset onto a BSA threaded frame Large custom sealed 6806 bearings are replaceable and serviceable Product Specifics Bottom Bracket Shell I. D.: 1. 37 BB Frame Interface: English BB Shell Width (mm): 83 Defined Color: Black Today's Stock