Park Tool GSC-1 Gear Clean Brush

Park Tool GSC-1 Gear Clean Brush The Park Tool GSC-1 Gear Clean Brush is a simple brush design that makes it easier to keep your transmission clean. The curved and toothed end cleans stubborn grime from between the cassette sprockets while the stiff nylon bristles allows thorough cleaning of the derailleurs and chain. The brush ius also handy for cleaning behind V-brakes and other hard to reach places on a bicycle.