Review on 🔧 Park Tool HCW-11 Slotted Bottom Bracket Adjusting Cup Wrench: 16mm Precision Tool for Bike Maintenance by Rusty Smith

Bicycles use several types of adjustable bottom bracket cups (bearing shells that rotate with the front sprocket). The bearing is adjusted by loosening the lock ring (using another specialty wrench) and then tightening or loosening the adjustable cup until the sprocket axle is not loose or loose but still spins freely (i.e. not too tight). or too loose). The cup is then held stationary (with this wrench) while the locking ring is re-tightened. If your bike uses an adjustable cup that requires this wrench, you need it.