A dirty drivetrain causes poor shifting and unnecessary wear to expensive parts. The Chain Gang contains everything needed to quickly and easily clean the chain, freewheel cogs, and chainrings. The Chain Gang includes a CM-5 Chain Scrubber, a GSC-1 GearClean® Brush, and an 8oz bottle of CB-2 Citrus Chain Brite. The CG-2 works on all derailleur bikes and many 3-speed and coaster brake bikes.