Park Tool Bottom Bracket Tool BBT-29The 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) as well as 16-notch bearing cups with an outside diameter of 48.5mm (e.g. FSA MegaEvo).Features: Removes bottom brackets with 16-notch bearing cups with an outside diameter of 39mm as well as 48.5mmBuy Park Tool Workshop from Chain Reaction Cycles, the World's Largest Online Bike Store.