Originally Posted by rotax793
So you mean it could be that it's the same pattern, only a firmer inner construction?
actually a radial typically is softer construction, but when racing they also use a mousse insert which feels about like 8psi, but no problems with flats so the more flexible carcass will conform to the terrain better (more traction) but with no chance of flats.
also it's usually more expensive but racers don't care. well, at that level anyway. ;)