Park tool bottom bracket tool bbt 9the ideal item for your workshop, this bottom bracket tool makes quick work of installing and removing 16 notch bottom brackets.versatile and durable bottom bracket toolcombining two heads in the one tool for optimum versatility and convenience, the smaller end of the bbt 9 fits neatly on the 8 splines of the crank arm adjustment cap for easy removal, allowing you to flip the tool and connect the optimised hole end to loosen the bb cup. Installing the new bottom bracket is just as simple. Suitable for cups and lockrings with outside diameters of around 44mm, and rotor disc lockrings with 16 external notches, the bbt 9 can be used on models includingshimano hollowtech iicampagnolo ultra torque and power torquerace facefsasramtruvativchris kingphil wood outboard bearinghawk racingtokenfulcrumfeaturescompatibility cups and lockrings with 16 external notches and 44 mm outside diameterfunctions 16 notch bottom bracket engagement hole, 8 spline crank arm adjustment cap fittingbuy park tool workshop from chain reaction cycles, the world's largest online bike store.