Originally Posted by
vasuvius
Just mounted a set of Conti GP 4 seasons 25mm.
Unfortunately on my rims, they are exactly the same width as the 4000s 23 mm -- 23mm!!
I'll try the 28mm next time if I like these.
Tires do stretch a bit over time. I think you'll find that after a few good rides on the new tires they will measure a little bit wider, but it's definitely true that Conti tires tend to have a smaller margin between sizes when compared to other brands.