A dirty drivetrain causes poor shifting and unnecessary wear to expensive parts. The CG-2.4 contains everything needed to quickly and easily clean the chain cogs and chainrings: CM-5.3 CYCLONE™ CHAIN SCRUBBER Clean bicycle chains quickly easily and effectively without the hassle and mess of removing the chain from the bike. The CM-5.3 uses an extra-large solvent reservoir and a series of four rotating brushes to get chains sparkling clean inside and out. A magnet at the bottom of the CM-5.3's solvent reservoir draws away particles scrubbed from the chain effectively keeping them from being redistributed on the chain during cleaning. The durable sponge material draws solvent from the chain as it exits the CM-5.3 reducing drips and mess. The CM-5.3 can handle any bike-specific chain from wide 3/16' single-speed* to narrow 12 and 13-speed. A reversible handle allows the chain to pass through forwards or backwards for compatibility with center drive e-bikes. CB-4 BIO CHAINBRITE Park Tool CB-4 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 with a scrubbing brush as a general purpose degreaser. When used with a chain cleaner CB-4 gets bicycle chains clean inside and out so they're good as new. Will not harm alloy plastic rubber or carbon fiber parts so it's safe to use for cleaning cassettes chainrings pulleys or any other component that accumulates muck and grime. GSC-1 GEARCLEAN™ BRUSH The GSC-1 is specially designed to free your bicycle drivetrain from muck and grime. The comfortable handle features a contoured toothed end to reach dirt deep between the gears and tough nylon bristles clean the derailleur and chain. Saves wear and tear on your chain and cassette. Also works great on derailleur pulleys brakes or other places where dirt collects. CG-2.4 FEATURES The Chain and Drivetrain Cleaning Kit includes: CM-5.3 Cyclone™ Chain Scrubber GSC-1 GearClean™ Brush 8 oz. bottle of Bio ChainBrite™ The CG-2.4 works on nearly any bike including multi-speed single-speed and e-bikes. INCLUDES: CM-5.3 Cyclone™ Chain Scrubber — Instructions GSC-1 GearClean™ Brush CB-4 Bio ChainBrite™ — Instructions