I have a set of pheonix slicks on my chevelle 29.5x11.5W. I bought them used from a swap meet. They work great, I have no traction problems at all, but the tires just don't smoke when doing a burn out. I have tried all types of different burnouts...long, short and different spots in the burnout box. They don't have much life left now, are they just getting old?? They are still soft.