My old bike is what I would consider a sports tourer. The frame angles were spec'd to the racing angles of the time but the chain stays are 1.5 to 2 cm longer than the racing stays. Many years ago I put a handlebar bag on it but it totally changed the ride and I took it off. Never to even consider re-installing it. If I get the need to carry more than my little seat bag holds I will try a rear rack and trunk. It would have to be better than the handlebar bag.