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4
  • How many miles on this bike? My rough rule of thumb is a chain lasts 2000 miles, a rear cluster 5000, and the most-used front ring 15,000. But running a worn-out chain will damage both front and rear sprockets sooner. Commented Jul 10, 2015 at 16:54
  • I wouldn't say much over 1200 miles, but probably half of that was done over the last month. Could this kind of usage contribute to sprocket wear? Also worth mentioning, the old chain was most definitely worn. Well over 1/8" lengthening, and I'd neglected to lube it regularly. Commented Jul 10, 2015 at 16:59
  • Yeah, my 2000 mile rule assumes reasonably regular lubrication. If the chain were run dry that would contribute to wear of both the chain and the sprockets. Commented Jul 10, 2015 at 17:02
  • Alright, I'll compare the sprockets to some pictures from online to check - again - that they are or aren't worn, in a few hours. Commented Jul 10, 2015 at 17:22