I agree with everything MKharl said and I like his choice of tires, but remember to make sure it will fit between the chainstays before you buy any of the larger sizes. The practical limit for my road bikes is a 28mm tire. There's a big variation in sizes, too. I have one set of 28mm tubulars that are actually 28 millimeters wide. The rest are clinchers and are really 25 or 26mm.