Originally Posted by
Wildwood
Shucks, those pictured tires have knobs everywhere. Makes me wonder if a smooth treaded tire 30-32 might fit? If 27/28mm with ti frame are not smooth enough for one's paved streets, then try a very high end, high tpi, supple tire - before moving on from one that fits.
As a general rule of thumb, there should be at least 3mm of space between each side of the tire and the chainstays. If you are already at that point with 25mm tires, then going to a 28mm may still roll, but will rub when the frame flexes on hill climbs or hard acceleration in general - not a good thing.