The Cervelo BBRight Bottom Bracket is a 24x90mm bottom bracket built for Shimano cranks that don't feature a built-in spacer. The Cervelo BBRight Bottom Bracket is a 24x90mm bottom bracket built for frames with a BBRight 79mm bottom bracket shell and 24mm spindles. This bottom bracket features 1 inboard and 1 outboard bearing giving it an overall width of 90mm.