Our standard bb systems are shimano compatible the 7075 t6 alloy cups feature cnc finishing and come polished or anodized smooth and durable the high grade bearings are fully shielded with quad ring seals compatible with most shimano race face and fsa external bb configurations that use a 24mm crank spindle available for road and mountain systems 7075 t6 forged and cnc cups english threads standard shimano bb tool for installation 94g weight 73mm