What I have is an old Peugeot that is about a 54 or 52 cfm bike and I should probably be on 58 or even 60cm bike at six feet tall. I only got the thing last spring, free from a friend who was out hunting disgarded bikes for me. Well, I put a lot of time and a little bit of money (not much really) into fixing it up and getting it road worthy. I can;t bring myself to sell it. My question is this: what are the (negative) ramifications of riding a bike with (1970's) race geometry that is two sizes too small? It it going to be "twitchier" than it should be or harder to control than a "normal" sized bike? Am I in any physical danger from any kind of a strain or muscle pull or any thing from being in a more compact riding position than the designer intended? Will I still be able to have fun?