A sturdy contoured brush for cleaning cassettes, freewheels, and tires.
Park Tool BCB-5 Professional Bike Cleaning Brush Set - Dan's Comp
Muc-Off┃Tire and Cassette Brush – Dismount Bike Shop
Park Tool GSC-4 Cassette Cleaning Brush - Cambria Bike
Park Tool GSC-4 Cassette Cleaning Brush (Blue) - Performance Bicycle
Park Tool GSC-4 Cassette Cleaning Brush (Blue) - Dan's Comp
Park Tool GSC-4 Cassette Cleaning Brush - Cambria Bike
GSC-4 Bicycle Cassette Cleaning Brush
Park Tool Gear Clean Brush - Giant Las Vegas
BIKEHAND 6 Pieces Bike Bicycle Cleaning Brush Kit - Cleaning Washing Tools Set - Bicycle Chain Parts Cleaner Maintenance Service Kit - Suitable for MTB, Road Hybrid Bikes : Sports & Outdoors
Muc-Off┃Tire and Cassette Brush – Dismount Bike Shop