thanks for the posts.
I'm a long-time Conti GP4000 user. I converted to 4000S after the vectran introduction and the Contis were the best performers in the neutral German research on tires.
(Tour magazine).
Anyway, can anyone tell me the height difference between 4000S 23mm and 25mm?
I'd like to put a 25mm on, particularly on the rear, as I'm a 90kg rider, but the rear on one of my bikes has precious little clearance to the FD clamp.
If you have an estimate of the height difference, it's best if you can check it when the tires are new, and control for equal pressure and equal rim shape.
I noted that on my rims, at about 110PSI, the 23mm Conti 4000S was actually closer to 24mm wide.