I have been riding 700 x 23 since I got my bike 10 years ago, but went with a 25 this time. Continental 4000. I like the feel of this brand tire, nice and supple with good road feel. I can already tell the 25 cushions the ride as I do not feel the smaller imperfections in the road that I did on the 23's. Thinking I am gonna like this setup just a wee bit more for the comfort factor. I weigh just under two bills, I probably should have been on this size long ago.