Originally Posted by
chrisx
Does this say you are carrying a second chain for 15,000 miles? (fifteen thousand.)
Chains do not last 15,000 miles, they might last 1,500 miles, maybe.
I currently rotate two chains. They have 5500+kms and show approximately .25% stretch. So if I were to run the drivetrain to, say, 1.5% stretch, that would translate into 33000kms or 20,000 miles.