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I bought a second hand bike and was about to replace the chain until I measured the wear on the existing chain, and it was really stretched (3/16 of an inch over 12 inches). I imagine this will have worn the cassette(altus) and chain ring(small bosch one) quite badly. Should I bother replacing the chain at this point or should I just run the current drive train into the ground after a decent clean and replace the whole lot in one go or will changing my chain now have any chance of saving my cassette and chainring or is the picrel(shalom) correct and a new chain will just be stretched out quick by the already worn cogs.
It is not too expensive to do the whole thing either so will getting a fully new drive train significantly improve the quality of the ride or should I keep everything on until something breaks?