Those numbers are in mm. 245/40/18 means the tire is 245mm wide with a 40 aspect ratio (height of the tire or sidewall) on a 18 in diameter rim.
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Those numbers are in mm. 245/40/18 means the tire is 245mm wide with a 40 aspect ratio (height of the tire or sidewall) on a 18 in diameter rim.What does it mean when the numbers are in the 200's x 40's x 80s or some shit like that? SO confusing