Sinz Elite XXX bottom brackets are the ultimate upgrade for any 24-millimeter spindle crankset. You get a killer, high-quality, silky smooth bottom bracket that features forged and CNC-machined external aluminum cups and are compatible with Sinz Elite XXX, Shimano and other 24-millimeter spindle cranksets and fit standard English thread (1.37” x 24T) 68- and 73-millimeter bottom bracket shells. The Expert model rolls on super-high-precision sealed bearings, but has a weight of 89 grams.