Last night I happened to check chain wear on my bike and to my surprise, it was considerably worn. That chain went on new in April of this year and has 3000 miles on it. I had never kept track of previous chains amount of time in service so my sense that this particular chain has been short lived could be wrong. I put on a shiny new chain from the bike shop first thing this morning which seems so far to be shifting correctly. How many miles are people getting out of a new chain?