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Calculating Tire Dimensions

 
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Old 10-08-2009, 10:17 AM
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Calculating Tire Dimensions

I see a lot of threads where people ask if, said tire, will fit without issues.

I hope this helps, not that people search threads.



Width x Aspect Ratio = Section Height
Section Height x 2 = Combined Section Height
Combined Section Height + Wheel Diameter = Tire Diameter

Example: 205/50r16 (Stock 5th gen size)

205mm x .50 = 102.5mm
102.5mm x 2 = 205mm
205mm + 406.4mm(16")= 611.4mm

The first number is the width of the tire in millimeters, measured from sidewall to sidewall.

The second number is the aspect ratio. This is a ratio of sidewall height to width. In the example above, the tire is 205mm wide, multiply that by the aspect ratio to find the height of one sidewall. In this case, 205x0.50=102.5mm.

The last number is the diameter of the wheel in inches.

To figure the outside diameter of a tire, take the sidewall height and multiply by 2,(remember that the diameter is made up of 2 sidewalls, the one above the wheel, and the one below the wheel) and add the diameter of the wheel to get your answer.



If you keep your wheels/tires as close to stock diameter as possible this will help you with not having issues.




There is a lot more information here at the Tire Tech section from TireRack.com that should cover any questions you have.

Last edited by HardKnoxBB2; 10-08-2009 at 10:24 AM.
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Old 10-08-2009, 05:37 PM
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Re: Calculating Tire Dimensions

While that's great, it's all included in this thread --> Recommended Tire size & Offsets!

And you know what, it's stickied. And people still don't see it.
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