What is the real difference in the B33A and the SS33A tires Brian, do you know? I have and use both and have not really been able to tell a difference on the track or with lap times. I have heard the sidewall is stiffer, softer and that its the same, have heard they are a little softer duro than the SS33A but can't say thats what I see, duro is the same between both on all the tires I have gotten the past year. It does seem like the B33A require less prep to get speed out of them, but I'm not sure on that. I know Mike gave a little info about the tires on here awhile back but I didn't see the post when I searched for it.