Quote:
Originally Posted by LNXGUY  A 305 is wider then a 265, that number doesn't indicate sidewall height at all.
Sidewall height is the second number in the equation...
Theoretically, a 305/75-16 tire on a 16inch rim should be the exact same diameter as a 265/75-16 on a 16inch rim.
I'm just arguing semantics, but you see where I am going with this?
And yeah, you'll burn more fuel trying to push/pull a 305 series tire down the road compared to the skinny 245 stockers  To bad good looks and rotational mass usually go together. | Close, but not quite on track. Yes, the 305 is representative of width in millimeters while the 75 represents the aspect ratio to the width, in this case the height is 75% of the width, which would be 229mm tall. At the same time, the 265 with the same aspect ratio would only be 199mm in height. Therefore, thinking the height remains the same between the two tire sizes because some of the numbers are the same would be incorrect. Hope this helps. 
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