I've tried everything from 33/34, which I find too sluggish at turn in and mid corner(bike also standig up @ mid corner),and everything inbetween to 40/40, to my current set up 36-37/38. When riding my connie like a liter bike, this seems to yeild best feed back, grip and not too excessive bar inputs needed for aggressive sport use. Also, you will find rider weight to be a consideration. I weigh 160lbs, 177lbs full gear.