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Can anyone explain to me what all those tire numbers mean? ex..215/50/17 i know they ahve to do with the size or something but thats pretty much it..Thanks
 

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So in the example above the sidewall height is 50% of the width of the tire.

215mm = 8.5 inches (25.4 mm in 1 inch)

8.5 x .50 = 4.25 inches (this is the sidewall height)

To get the overall diameter of the tire, take 4.25 x 2 (2 sidewalls in the overall diameter). 4.25 x 2 = 8.50 inches. Add this to the wheel height. 8.5 + 17 = 25.5 inches. This is an approximate height of a 215/50/17 tire.
 
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