Oh I don't know. I mean look at the double dees, and then look at the hole shots. They look so dissimilar (dissimilar means different) to one another that there is no way they would work in anything close to the same conditions. In case you couldn't tell, I was being sarcastic. I mean really? I guarantee that if you closed your eyes and had a friend of yours hand you a DD and a HS (both tires for the same type of vehicle, with the same foams and glued to a rim) that you would have a very very difficult time telling the difference between the two. I could see if the tread patterns were way different, but they are so close to the same thing, that one would have to be a dunderhead to think that they would not work in a similar manner, in the same conditions. I say again, really?