Check out what Sheldon Brown (R.I.P.) had to say on this topic: http://sheldonbrown.com/tire-sizing.html My suspicion is that your wheel's rim is most likely not safely compatible with 700x23 tires, though if the interior rim width is 15mm (no more, no less), then Sheldon's table suggests it may be OK. I suggest you look at Gran Bois or Roly-Poly's in 700 x 28 or 700 x 30. If you are insistent on thinner tires Vittoria makes a very nice 700x25 Open Corsa. I myself would not go narrower than 700x25 with your rims. JMO/YMMV. ~OG