Originally Posted by
Rons
The chain has probably 500 miles at most. I'm guessing that those two cogs are the ones I use the most. I think the 19 and 21 get the hardest use because I use them the most when on the hills. I haven't called any shops looking for individual cogs yet but couldn't find any sources just looking on line.
Individual sprockets are hard to come by, and if you find them, so expensive that 2 would cost about what a cassette does.
I'd live with the noise or (shameless plug coming) use a chain oil that effectively muffles the noise.