This is a picture of a Dunlop D211 that has been ridden on at the wrong temperature. These are road tyres that are simply moulded without tread so they are the same compound/construction. All that has happened is where I have been getting on the throttle coming off the bends the surface has started to tear away. Fortunately I felt it happening and stopped before it was completely wrecked. Treaded tyres are slightly less susceptible to this as the tread allows the rubber to move and heat up, but hopefully you get the idea.
