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Old 10-25-2006, 10:47 PM
JohnTN JohnTN is offline
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My 15" 70 series Yokohamas are stated to be 26.9" diameter, or 13.45" radius. When mounted on the car, I measured from the center of the wheel to the ground and got a radius of only 12.75", an effective diameter of 25.5". That's a 5.2% reduction.

At speed they might expand a little from centrifugal force, but I don't know if it is significant.

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