Originally Posted by
ThermionicScott
IME, even if a chain doesn't have much stretch, it can run a little rough with a brand-new cassette. I'd buy a new chain and rotate the old one back in after another 1000 miles.
I was kind of hoping the chain would be stretched enough to warrant a replacement, but I really can't measure any stretch. It has 1100 miles, but I mostly ride in the 100-150W bracket and I'm a spinner so I'm not putting enormous stress on it. Also, it runs fine on most of the cassette, just not those two sprockets...