Yesterday I installed a Continental Hometrainer Tire on the rear of my CX bike (which had been purchased mostly for trainer use and which came with knobby tires unsuited for that purpose). To my surprise, the sidewall of the tire is marked "for trainer use only, do not use on road."
Why would this be? It feels like marketing, like the camera tripods of 15 years ago that were marked "for digital cameras only" (spoiler: they work with film cameras too).
Beyond potentially getting them dirty, is there any risk to using such tires on the road?
