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      06-01-2010, 04:20 PM   #8
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Drives: 2009 E90 LCI
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Originally Posted by Biimmer View Post
Still confused.. I have always thought that the "30" in a 275/30/19 tire would refer to the thickness of the sidewall. How does the width have any effect on the diameter/aspect ratio?

Thanks for the help I'm trying to learn

If you are talking about the distance from the rim edge to the tread, you'll want to refer to it as "sidewall height."

Sidewall "thickness" denotes something else completely--(i.e. RFT sidewalls are thicker so they won't collapse when punctured)
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