Park tool chain gang chain cleaning system cg2 3a 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 with no mess or fuss features cm 52 chain scrubber gsc 1 gearclean brush 8 oz bottle ofchainbrite the cg 23 works on all derailleur bikes and many 3 speed and coaster brake bikesbuypark tool workshopfrom chain reaction cycles the worlds largest onli