My Bianchi Talladaga road bike is a 53cm and Im 5'10. I wonder what problems I could face with a bike that might be to small. I had the bike fitted - seat back and longer stem, so there is no cramped feeling with my neck or arms or back. I wonder about my knees/legs. I seem to have some muscle pain in one knee and leg - same leg. Could it be that I do have a good fit, even though the frame is smaller?