1x Shimano 2.5mm Black External Bottom Bracket Spacer. If you have a 73mm bottom bracket shell you will require 1 spacer - 1 spacer on the drive side and 0 spacer on the non drive side (total 1). If you have a 73mm bottom bracket shell you will require 1 spacer - 1 spacer on the drive side and 0 spacer on the non drive side (total 1) ".
