So I did the chalk thing:


I was able to wipe off chalk 3mm deep into the sidewall. I was pushing the bike fairly hard and was either in line with the bike or had the bike very slightly lower than me but I never went to the absolute limit. Plus, this was all on flat roads. I definitely am nowhere near what more experienced riders around me do on a regular basis.

Are there other people running 25mm tires on these rims or similar? It seemed like there were a lot when I was doing my homework. One user Hexsense actually posted about using 25mm P Zeros on this wheel on WW. At this point, I'm not sure what the correct course of action is. Should I assume that this isn't an issue since Cannondale, Hunt, Enve, Specialized, Cadex, Light Bicycle etc. all say so? I'm tempted to switch at least my front tire to a Corsa to get just that little bit of extra tread but I'm not sure if even that would be enough - 5mm more tread means 2.5mm on each side. I'd prefer more like another 4mm on each side, at least on the front. Maybe 3 on the rear. I can definitely fit a 28mm rear, but a 28mm up front would leave me with 2mm of clearance to the fork crown - tight.

What do you guys think?