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Park Tool
GSC-1 Gear Cleaning Brush

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MSRP:$4.95
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Great for cleaning grime from between cassette sprockets or wherever else dirt hides. Curved jagged end fits nicely between sprockets while the durable nylon brush sweeps all the dirt away. Simple yet effective. Even fits between narrow 10 speed cassettes.

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Great for cleaning cogs as both sides fit.
by Anonymous
Cycling Enthusiast
Portland, OR

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.

Reviewed 4/3/2018
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Works good.
by seabiker
Cycling Enthusiast
Oregon Coast

Works as advertised.

Reviewed 2/11/2015
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Gets into hard to reach places
by Loutog
Cycling Enthusiast
b

Great brush. What more to say?

Reviewed 11/11/2013
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Works well getting the road junk off the moving parts
by MarkD
Central California

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.

Reviewed 10/18/2013
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Does the job
by ja
Cycling Enthusiast
Asbury, NJ

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.

Reviewed 10/10/2012
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It does the job!
by b. hicks
Vancouver, WA

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

Reviewed 10/1/2012
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works great for getting out tough grime
by Anonymous
Cycling Enthusiast
New York City
2 of 2 customers found this review helpful.

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.

Reviewed 9/20/2012
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