Swap your 11-23 for a 12-26 before you head out to the annual hill climb race. The Park Tool SR-11 11-Speed Compatible ChainWhip / Sprocket Remover will help you swap your cassettes in record time, even if you're running that newfangled Italian 11-speed. The one-inch box wrench in the handle fits all Park Tool freewheel and cassette lockring tools.