[johnmyster]

If you take a wheel from the right, and put it on the left, it's now spinning backwards - thus, it still has the same directional creep. If you mount it whitewhall in, it's now spinning backwards - thus, preserving directional creep. It has to do with how the non-radial, non-belting plies are laid, and how even the radial and belting plies are seamed. The only way they'd creep left is if you drove in reverse. Only then, reverse would be the new forward, and left would be the new right.

So even if you take a directional radial and spin it backwards, it still maintains creep. Directional tires are only directional because of tread design. Some performance tires are built with a stiffer sidewall to go outside - thus, they're not directional, but inside/outside specific.