My 2012 Trek 7.3fx currently has 16,899 miles on it. I scrape the gunk off the sprockets and jocky wheels and wipe down the chain when I lub it, but other than that don't do any special cleaning. I lub the chain every 200-300 miles or after riding in the rain or if it starts to get noisy. I change it when my gauge shows it has worn 1/16". Below is my chain and cassette usage from my log:
Factory Chain - 1385 miles on chain
KMC z52 - 2343 miles on chain
KMC z52 - 795 miles on chain (changed because it was noisy..think it had defective link)
SRAM PC850 - 3054 miles on chain
SRAM PC850 - 5401 miles on chain
SRAM PC850 - still going with 3922 miles on chain
Shimano HG31 (Factory) - 3725 miles on cassette
Shimano HG41 - 4415 miles on cassette
Shimano HG31 - Still going with 8757 miles on cassette
Jim
Last edited by jtaylor2; 07-11-17 at 05:57 AM.