The SL23's are 24mm from outside edge to outside edge. My tires are rated as 23mm, but are actually a shade over 25mm when fully inflated. I'm running 105 psi in front and 110 - 115 on the rear. The bike weights ~17.5 lbs, and I tip the scales at 200 (and dropping ).

I do have a set of tubulars, and I'm well acquainted with their relative immunity to pinch flats, but I prefer to save those for special events, especially rides that will include a bunch of climbing.

I've considered going tubeless, but don't know that much about them. How do they ride compared to more conventional set ups? Do they add much weight? Is there a decent selection of tires that can be used in a tubeless configuration?

Thanks!