I've always been using mountain bikes, but recently I've enjoyed my first racing bike, for faster commuting. The (slick) tires are very thin, ca. 1inch, and I have no idea what is the reasonable pressure for them. I pumped them up as much as I could, and riding is great. I'm only not sure whether it is safe enough or not, especially in the rain (are the slicks ok in the rain at all?), the grip is far worse than what I'm used to in my mntn bike...
