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here is a helpful tool i found - http://www.miata.net/garage/tirecalcold.html

 

choose the stock tire/wheel size on the left - then the "new" tire/wheel size on the right, the graphic will show you the difference using lines as the stock size to show you the differences - play around with different sizes until you find one that is closest to the original overall diameter and you have found what you are looking for.

 

it also tells you the difference in speedo the change will make under the graphic - might want to pay attention to this as well...

 

looks like a 205/55 is very close to the stock diameter....

 

good luck

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here is a helpful tool i found - http://www.miata.net/garage/tirecalcold.html

 

choose the stock tire/wheel size on the left - then the "new" tire/wheel size on the right, the graphic will show you the difference using lines as the stock size to show you the differences - play around with different sizes until you find one that is closest to the original overall diameter and you have found what you are looking for.

 

it also tells you the difference in speedo the change will make under the graphic - might want to pay attention to this as well...

 

looks like a 205/55 is very close to the stock diameter....

 

good luck

 

That tool is great too if you're trying to figure out how much your speedometer is off once you go with different than stock sized tires. I can see that with my 215/75/R15 tires that my speedo is approx 19.4% slower than stock. This also helps when I calculate my fuel economy with the larger tires.

 

Oh, and according to TireRack.com the stock tire size for my 86 GL is 185/70-13.

Edited by bobs97c5
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