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  Track Cog 21T 1/2X1/8 SILVER CHROMOLY By: Action Average Rating: 5.0 Total Reviews: 1 More Information the best cog for the job  On: 2009-10-21when it arrived i was not really all that amazed but when i put it on i realized that it is a bit wider than one of my other cogs so the locknut held well. it works well with my 52 tooth chain wheel. (i know it is big but it is the only hardened steel 3 hole chain wheel i could find) |
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