[tabascobobcat]

I may just be in the little bit of knowledge is dangerous area here. The many parts/components of the tire are molded together with the rubber that we actuallyy see with a 3 part mold, 120 degrees each, so it is actually more triangular than it is square. Difficult to maintain and even pressure across the three molds at the same time. Hence the 3rd harmonic properties. Goodyear let me do this once to try to gain an appreciation on how difficult it is for them to control the various parameters involved.