Park ToolGSC-1 Gear Cleaning Brush(Return to Product Page)

I like this because it allows me to do a very thorough cleaning of bicycle cogs. Even with regular chain cleaning, winter riding can gunk up the cogs and rear derailleurs, so this tool is great for getting to the hard-to-reach places.

Works as advertised.

Great brush. What more to say?

I purchased the GSC-1 cleaning brush with the Park Tool CM-5 Chain Cleaner. A great combination of tools to make those bike parts sparkle.

Does the job better than anything else I've tried. Along with a small amount of degreaser, the combination of stiff bristles and scraper work well in getting buildup off the cogs.

Works a whole lot better than the comination toothbrush thing I was using before. I'd recommend it!

Bristles are stiff and long enough to get out caked on grease on both cassette and between the small and large chain rings.

Not sure if the toothed semi-circle thingy is all that useful.