A sturdy contoured brush for cleaning cassettes, freewheels, and tires.
Park Tool Gear Clean Brush - Park's Gear Clean Brush has a handle on one end with a curved, serrated edge perfect for cleaning between cassette cogs. The other end's tough nylon bristles are ideal for cleaning the derailleurs, chain and other drivetrain parts to keep them clean and prevent premature wear. It also works great on brakes and other components that collect dirt and grime. The GearClean easily fits in a toolbox or pack.
Park Tool GSC-1 GearClean Bike Cleaning Detail Brush
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8-in-1 Bicycle Cleaning Brush Tool – Electric Bike Paradise
The Muc-Off Claw Brush boasts a high quality construction with three brush heads that feature tough nylon bristles and an integral scraper for mud de-clogging. It's great for cleaning your bike's chain, cassette, mechs and sprockets. Scraper for mud de-clogging. Tough nylon brushes. Features 3 brush heads. Integrated pick and scraper.
MUC Off Claw Brush
Tire & Cassette Brush
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Bike Chain Cleaning Brush Bicycle Chain Washer Claw Brush Cycling Cleaning Tool Cassettes Clean Kit Motorcycle Scrubber Brushes - AliExpress
Park Tool BCB-4.2 Bike Cleaning Brush Set Plus the GSC-4 cassette brush
A large comfortable handle with a curved, toothed-end reaches dirt deep between the gears, and tough nylon bristles clean the derailleur and chain.
Park Tool GSC-1 Gear Cleaning Brush
GSC-4 Bicycle Cassette Cleaning Brush