Tire size aspect ratio question.

jcbaert · Feb 15, 2013

Ok Zoom, before you get too upset about my post, just give me a second. I have read a couple things and am not quite sure what is correct. When it comes not metric sizing and the aspect ratio, if I have the same width and aspect ratio of tire, will I always have the same total outer diameter of tire, or is it dependent on the rim size also? For instance, is a 285/75/16 going to have the same total diameter as a 285/75/17 or even 18? I feel like I have read people saying it both ways and am wondering if anyone knows for sure which is correct. Thanks for any information.

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wade23454 · Feb 15, 2013

The aspect ratio is tire width vs sidewall height. If you increase the wheel size, and aspect ratio is the same, then the result is a taller tire. So, using your example, a 285/75r17 would be 1" taller than a 285/75r16.

jcbaert · Feb 15, 2013

Thank you, that is what I thought but wasn't sure.

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zoomzoom · Feb 15, 2013

using the 285/75/16 as an example, you want to use 285/70/17 to stay approx within the same overall diameter.

RikRong · Feb 17, 2013

In general, for every one inch you go up in wheel size, you want to go down about 5% in aspect ratio to maintain the same overall diameter.

atroader · Feb 17, 2013

Just do the math:

it is all in millimeters with the rim in inches.
E.g., 285-75-16 is
285/25.4 inches wide
x
285*.75/25.4 sidewall height X 2 sidewalls + 16" rim = total tire height

09eq · Feb 17, 2013

Go to toyotires.com - they have specs listed for all their tires

invasion08 · Feb 17, 2013

Here use this. Tire Dimensions Made Simple - Discount Tire

Tire size aspect ratio question.

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