BOTTOM BRACKET PARK BBT-9 SHIMANO HOLLOW TECH IICompatible with Shimano Hollowtech II as well as Campagnolo Ultra Torque and Power Torque, Race Face, FSA, Sram and many other 16 notch 44mm bottom brackets One end of the BBT 9 securely engages the 16 notches of bottom bracket cups the other end of the tool engages the 8 internal splines of the crank arm adjustment cap on Shimano Hollowtech II systems The BBT 9 fits cups and lockrings with 16 external notches and an outside diameter of approximately