The Continental GP4000s with the black chili rubber compound only come in 700x23 but they are about the size of a 700x25. I had Conti GP4000 (not s) 700x23 before these and they were smaller in width (now have to push to remove wheel from fork). Reportedly the chili compound provides longer mileage and less rolling resistance. So far for me they have been very durable. Close to 2 years (4000 miles) and they look new. They are smoother on our crappy roads here too.