On cb750s I recommend Metzler lazertechs. They are the best tire I have ever used on a cb750 (although the fronts don't have a ribbed pattern so they wobble slightly on deceleration). For round town riding they grip like glue and flat rock. For a more vintage feel Avon speedmasters work, but I prefer the venoms. I have a set of venoms on a supersport and they flat rock.