I thought I would post an update. I ended up finding a deal on the Challenge Strada Bianca's that I couldn't pass up. The tire width is rated at 30mm, and once installed on open pro's, I measured 30.3mm after inflation to 80 psi. After a couple weeks and maybe 50 miles on them, they now measure 30.6mm so they seem to be stretching out a bit.

The tires have a reputation for being hard to install the first time. That is mostly due to the way they are constructed, not because the Kevlar bead is too small for standard rims. Unlike most other tires I have used in the past, there is no, what I would call, structure to the tire cross-section. The tires lay flat when they are off the rim. Basically, it looks like the tire just consists of a casing (layer of cloth that is incased in rubber), with a puncture protection strip glued to the inside of the casing, a rubber tread glued to the outside of the casing, and a Kevlar bead on the edges to interface with the rim. As far as I can tell, no mold was used in the construction of the tire. As such, when you try to install the tire on a rim, it wants to lay flat. I found that in order to get the second bead on the rim, I had to inflate the tube a bit to get the tire to round out some. They refer to the tires as open tubulars, which seems apt in this case.

As far as ride goes, I can tell they are heavier than my GP 4 Seasons when accelerating from a stop. Not so bad though, once rolling. Interestingly, it seams like the rolling resistance is higher at higher inflation pressures than lower. This might be due to the puncture protection strip being more rigid than the casing, such that at higher pressure, the protection strip flexes more than the sidewall of the tire, and at lower pressures, more flex is in the sidewall where the tire is more supple. Just conjecture on my part, and maybe it's all in my head. That said, the tires really seem to shine at lower pressures. Much more cush than the 4 Seasons.

Overall, I am happy with them. Maybe it's buyer's bias, but I think they are an improvement over the GP 4 Seasons overall. Definitely in the comfort department, but then that should be expected for wider tires at lower inflation pressures. The tire casings are somewhat fragile though, and the sidewalls cut pretty easy, so we will see how they hold up. I'll probably try out the Vittoria Voyager Hyper tires next though, once these wear out, just out of curiosity.