Wheels Manufacturing BSA 30 Bottom Bracket - English BSA Frame Interface ABEC-3 Bearings For 30mm Spindle PurpleExternal BSA, English threaded bottom brackets featuring anodized aluminum cups with Enduro sealed bearings Mountain versions for 73mm or 68mm bottom bracket shells or Road specific versions for 68mm bottom bracket shells Offered in 24mm (Shimano, FSA, Race Face, etc), GXP 24 22mm (SRAM Truvativ), 30mm interface, SRAM DUB and Praxis M30 28 Compatible with 30mm diameter cranks with a spindle length of at least 104mm Angular contact: Enduro ABEC 5