Does anyone have any experience with the R4 aero from Bontrager? It's a narrower, aero tire. I'm putting upgrading from the stock front wheel on my Fuji (Alex AClass AKX R1.0) with a Mavic Kysrium Equipe to match the rear I already have, and I'm looking to improve on the tire while I'm at it. My wife won us a pair of high end tires at a triathlon night that we haven't used. They're 700x22, so a little narrower than I'm used to, but I'm going to run it as a front only. I've heard a few concerns about durability, and Im running it for a half iron and potentially a full iron later, only a couple training rides between.