Park Tool Dura-Ace 9000, XTR 980, MegaEvo Bottom Bracket Tool Double-ended bottom bracket wrench Smaller end fits 16-notch bearing cups with an outside diameter of 39mm (i.e. Shimano Dura-Ace 9000 series and XTR 980 series) Larger end fits 16-notch bearing cups with an outside diameter of 48.5mm (i.e. FSA MegoEvo)