CapriRacer, in another thread you wrote:
How much variance in tire diameter do tire manufacturers typically allow for a single passenger tire size in a single model? As a hypothetical example, how much variance in diameter do you think will be allowed in a production run of Michelin MXM4 in size 215/45R17 ? How do tire manufacturers measure diameter? With a $100,000 machine? Is the loaded rolling radius being measured, or the actual diameter?
Originally Posted By: CapriRacer
………. In fact, when tire manufacturers measure the diameter, width, etc. of tires, they commonly refer to those measurements as "24 hour measurements" - because those measurements take place 24 hours after the tire is mounted. A tire will continue to grow long after 24 hours, but 24 hours gets most of the growth out and is a convenient point in time to record the measurements………………..