Originally Posted by
HillRider
Correct and I accept your point. Instead of using miles as a determinant I should have asked how many chains your cassette will go through before the cassette itself has to be replaced.
I'd say to pick a number I'd go with 3, though I swap wheels and cassettes around based on whether I'm training, racing (road vs. crits) or climbing mountains so it's not as simple in my situation. Usually you'll trash the 15 - 19 range on a cassette since those cogs are used more than the extremes.