How wide a tire will fit on those? With all trends and research showing that wider tires are faster on the road, more comfortable and, of course, better for gravel, I'd want to make sure I could get enough tire under me for the expected useful-to-me life of the bike. The days of 25mm or less hard-as-solid-rubber tires are firmly behind us now. Unless you're into that sort of thing, then by all means...