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Tire size Calculator


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#1 SHO-Z

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Posted 29 December 2005 - 07:04 PM

http://www.1010tires...eCalculator.asp

#2 Sparky

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Posted 29 December 2005 - 07:20 PM

I like this one a little more:

http://www.miata.net...e/tirecalc.html

#3 staledale

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Posted 07 March 2006 - 04:22 PM

http://www.venommoto...lcalculator.asp

Here's a good one..scroll down

#4 Zerocell5688

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Posted 21 September 2009 - 06:42 PM

this whole thing should be a sticky in the brake/suspension section these links are amazingly handy especially if your looking into the effects upgrading your tires would have on your car! even if its an old post the links are still good!
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#5 kramerbuccs24

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Posted 21 September 2009 - 08:16 PM

I like this one a little more:

http://www.miata.net...e/tirecalc.html


Yup, I was going to post this one.

Also, I use this one all the time to figure out wheel offsets, backspacing, clearances, etc.:

http://www.e90post.c...isplay.php?f=12

#6 DeleriousZ

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Posted 21 September 2009 - 10:54 PM

Does anyone know if any of those take stretch into consideration when making the calculations?
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#7 kramerbuccs24

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Posted 22 September 2009 - 12:38 AM

I don't think so. Check out www.tyrestretch.com though fore an idea of where the tire will be in relation to the wheel (if your're thinking of a moderate to major stretch)
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#8 DeleriousZ

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Posted 22 September 2009 - 09:14 AM

I don't think so. Check out www.tyrestretch.com though fore an idea of where the tire will be in relation to the wheel (if your're thinking of a moderate to major stretch)


Yeah I've been there lots, I'm just wondering about overall diameter to try and keep the speedo accurate.
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#9 kramerbuccs24

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Posted 22 September 2009 - 11:58 AM

The Miata tire size link in this thread will give you the %-off for speedo readings :)
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#10 DeleriousZ

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Posted 23 September 2009 - 09:49 AM

Yeah it will, however when you stretch a tire, does it not change the overall diameter of the tire itself? That's what I'm thinking the calculators miss.

Maybe the effects are negligible and I'm overreacting, but that's what I do lol.
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#11 kramerbuccs24

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Posted 23 September 2009 - 10:21 AM

That is very true, never thought of it like that. You're saying stretching the tire is in a sense decreasing the aspect ratio by bringing the tread of the tire closer to the wheel? Makes sense to me, still not 100% sure if that's true or how much it would effect the speedo. Best way to find out is to go through radar traps or use a GPS and compare speeds, then you can just do the <5MPH or whatever calculation in your head.
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#12 Guest_gaunpro_*

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Posted 18 May 2010 - 12:49 AM

thank you very much
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