The RS500 HollowTech II Bottom Bracket from Shimano has outboard bottom bracket bearing cups for use with 2-piece cap-free design road chainsets. The minimal bearing interface gives superbly smooth rolling and easy installation.
BB-Type: HOLLOWTECH II
Threaded: BSA (BC 1.37)
Threaded BB shell width: 68mm (BSA)
Weight: 71 g