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    Rather than replacing the chain just in case, you can get a chain wear indicator for a few bucks to determine if the chain actually needs replacing.
    – noah
    Commented Aug 25, 2010 at 20:24
  • Yeah that can also do it but I've never bothered buying the tool. Yeah I know a normal ruler can give you a good idea as well. I figure that there is enough wear/use on a chain after a few 1000KM. Been using the same drive train on my Mountain bike for the better part of 10 years with only chain replacements this way. Used to race x-country on it and still commute on it about 50km a week plus a ride or two. Lots of use and never have a new chain skip. Commented Aug 25, 2010 at 22:30
  • The tool is quite inexpensive.. it's just a bit of metal with pegs.. if chain fits it's time to change.
    – John Hunt
    Commented Oct 10, 2012 at 15:16