Park Tool

BBT-29 Bottom Bracket Tool

The BBT-29 is a double-ended bottom bracket wrench designed to fit 16-notch bearing cups with an outside diameter of 39mm (e.g. Shimano Dura-Ace 9000 series and XTR 980 series) 

•  Also works on 16-notch bearing cups with an outside diameter of 48.5mm (e.g. FSA MegaEvo).