Don't know how many miles on the Fuji's rings but imagine quite a few after 33 years. This is a compact two ring chainring set and I think the wear I noticed most was on the largest chainring. One of the teeth actually came to a sharp point. Probably using both rings pretty equally. Probably should have changed the chain but I have kept it pretty well lubricated and don't ride in sand, etc. only pretty clear dry roads.