When your handy Park Tools GSC-1 brush starts to get a little chunky, or you've lost one too many bristles to an angry, muddy drivetrain, give your brush some much due love with the Park Tools Replacement Brush for GSC-1 GearClean brushes. Its nylon bristles clean derailleurs just like a fresh toothbrush gets your pearly-whites looking brighter than ever.
A replacement brush to keep your GSC-1 feeling new
Perfect for getting a gunky chain shiny and bright
Works like a replacement toothbrush for your drivetrain