I bought this tool after my shifts started to suffer. A quick check with the chain wear indicator tool showed that the chain was way beyond worn. I replaced the chain but the worn chain had worn out the cassette which skipped in several of the gears with the new chain. So I replaced the cassette also and it shifts like new. Spare yourself the cost of a new cassette, get this tool and check your chain often.
Use this tool to see if your chain has stretched and is causing unnecessary wear on the more expensive parts of your drive train. This is made by Park, it's cheap, and it should be in your tool box or at close reach on your bench.
We have 8 bikes in the family, and I maintain them all. I used to check chain wear with a ruler, which was not very reliable and almost certainly resulted in some chains being replaced before they were worn out and others being replaced long after they should have been. With the Park CC-3.2, I checked all 8 chains in just a couple of minutes, and easily determined that 7 were good and one was completely worn out.
Yes you can use a tape measure to check your bikes chain but I like tools that make my life easier. The fast go no go use of this tool is really nice to have if you have more than a couple of bikes to maintain.
Chain stretch is always something that is hard to gauge by just looking at it. This handy little tool is simple to use and does not break the bank. Just follow the instructions in the package and replace your chain when it says to!
This is a very inexpensive easy to use device to check for chain wear. While it is possible to use a tape measure, Park's chain wear indicator is easier to use and less prone to error