Tread depth is not the way to measure tire diameter! A tire's diameter CAN NOT be determined by the
it's size on the sidewall! Even the same size tire of a different design made by the same manufacturer
may not have the same diameter too! Measuring from top to bottom will not give diameter measurements
that are valid. If you want to know the diameter of a tire in question, go to the MFG.s site and find the revs per
mile for your tires and compare.
As for asymmetrical on one side vs the other in the front, under normal conditions, you will never be able to tell the difference!
Not only was I a tire store manager but, I owned and operated 22 tire and brake stores and was the largest
distributor of Yokohama tires. I even owned the next 6 months of production at 1 time. But that is another story for another time.