Don't stress swapping out bottom brackets with the Park Tool Bottom Bracket Tool for Shimano Dura-Ace 9000, XTR 980 and FSA MegaEvo. It features two ends, one with a 39mm diameter for Dura Ace and XTR, and the other with a 48. 9mm diameter for FSA MegaEvo. Both sides use a 16-notch design for securing to bearing cups to enable easy installation and removal of threaded bottom brackets.