Originally Posted by Sleeps
Well the tires are not that tall. Whip out a tape measure and see. The sizes are that size in inches only when they don't have weight on them.
Okay, agreed about the weight. There is an option to input tire size like 265/50/20. I guess it would just calculate the diameter 8-)) But I would not do that as GPS speed tracking and car speedo readings are almost the same now.
Using that logic cold tire and the running one should have differences in diameter. Suppose that is too complicated for PCM. More probable they just decreasing indicative speed by putting slightly less diameter to stay on safe side with speed limits. Just a buffer for driver vs speed cams. Very common practice among car producers.
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