A dirty bicycle drivetrain causes poor shifting and unnecessary wear to expensive parts. The Park Tool Chain Gang contains everything needed to quickly and easily clean the chain, freewheel cogs, and chainrings. The Chain Gang includes a CM-5.3 Cyclone Chain Scrubber, a GSC-1 GearClean Brush, and an 8 oz bottle of CB-4 Bio ChainBrite. The CM-5.3 Cyclone Chain Scrubber uses an extra-large solvent reservoir and a series of rotating brushes to get bike chains sparkling clean. A magnet at the bottom of the Cyclone’s solvent reservoir draws particles scrubbed from the chain, effectively keeping them from being redistributed on the chain during cleaning. Durable sponge material draws solvent from the chain as it exits the Cyclone, reducing drips and mess. To make it easy to control and use, we’ve even added a handle that works on either side of the cleaner. Works with all multi and single-speed bikes as well as both center and rear drive e-bikes. The brushes and sponge are replaceable (part # RBS-5). Park Tool’s GSC-1 GearClean Brush has a unique design. A large comfortable handle with a curved, toothed-end reaches dirt deep between the gears, and tough nylon bristles clean the derailleur and chain. Saves wear and tear on your chain and freewheel. Works great on brakes or other places where dirt collects. CB-4 Bio ChainBrite Bicycle Chain and Component Cleaning Fluid is a 100% biodegradable, natural, plant-based degreaser formulated for use in the CM-5.3 Cyclone Chain Scrubber, CM-25 Professional Chain Scrubber, or as a general purpose degreaser. Will not harm alloy, plastic, rubber, or carbon fiber parts.