The Park Tool BBT-7 Bottom Bracket Lockring Wrench., click to enlarge

Item # BBT-7

(discontinued) / Tools / Crank & Bottom Bracket

Bottom Bracket Lockring Wrench

The BBT-7 Lockring Wrench is used for installing and removing most six-notch bottom bracket lockrings with an outside diameter up to 46.5 mm, including Shimano® Dura Ace® 7700 and XTR® 950 Bottom Brackets. It is laser-cut and engages five of the lockring’s six notches for a precise, secure fit. The handle is vinyl-dipped for comfort.