Uhhh, maybe if you like pinch flats. I myself do not. I consider 25c the absolute minimum for me on a road bike, and I roll 28s on my commuter. Super narrow tires are the bicycle equivalant of stiletto heels-more fashion than function. High quality 25c tires roll just as fast as 23s and are very nearly as light. I'll take the extra 1 oz in exchange for a lot of reliability.