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Tire deformation is going to be very small if you think about it. The rolling circumference of the tire is the length of the tread. The tread itself is reinforced with steel underneath, so only the surface can experience minor stretching. The rubber part of the tire is well under an inch thick.
So the question is, why does some official tire spec regulatory body in Europe say a 215/45/17 tire is 23.9" when the way tires are measured implies it's 24.6"? Why is the car not hitting 60mph in 2nd gear if the tire is indeed 24.6"?
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