as a FYI...just turned 13,200 miles on the PR3s. Front is just starting to show signs of mild cupping, rear still wearing evenly. I'll probably get another 1,000 miles or so out of them. After running PR2s for that last couple of years on 3 different bikes, and now PR3s on 2 different bikes, I'd say I'll be going with another set of PR3s on each, then maybe try the PR4s.