FSA Mega Exo Tandem Bottom Bracket (68mm/73mm)
This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases Compatible with FSA tandem cranks, the BB-7000 features oversize cartridge bearings with forged and CNC machined external cups. To keep water and grim away from the bearings, the BB-8681 uses an internal composite center sleeve with double o-ring seals. Product Features