# Tire size question?

**URL:** <https://forums.speedlife.net/t/tire-size-question/36449>\
**Category:** NYSpeed Automotive\
**Created:** [October 4, 2007, 6:32am UTC](https://forums.speedlife.net/t/tire-size-question/36449 "2007-10-04T06:32:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Bigairskier1580](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bigairskier1580/32/7612_2.png) [@Bigairskier1580](https://forums.speedlife.net/u/Bigairskier1580)\
**Post date:** [October 4, 2007, 6:32am UTC](https://forums.speedlife.net/t/tire-size-question/36449/1 "2007-10-04T06:32:01Z")

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How much taller would the sidewall of a 215/70/15 tire be compared to a 205/70/15?

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**Author:** ![Avatar](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/avatar/32/5076_2.png) [@Avatar](https://forums.speedlife.net/u/Avatar)\
**Post date:** [October 4, 2007, 6:37am UTC](https://forums.speedlife.net/t/tire-size-question/36449/2 "2007-10-04T06:37:07Z")

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[http://www.miata.net/garage/tirecalc.html](http://www.miata.net/garage/tirecalc.html)

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**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\
**Post date:** [October 4, 2007, 6:38am UTC](https://forums.speedlife.net/t/tire-size-question/36449/3 "2007-10-04T06:38:12Z")

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P215 = Width in MM  
/70= % of Width which will equal your sidewall  
R15= Rim diameter

So to your question: Width difference= 15mm\*.7= 10.5MM = about .41 inch

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<div class="post-metadata">

**Author:** ![Bigairskier1580](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bigairskier1580/32/7612_2.png) [@Bigairskier1580](https://forums.speedlife.net/u/Bigairskier1580)\
**Post date:** [October 4, 2007, 6:38am UTC](https://forums.speedlife.net/t/tire-size-question/36449/4 "2007-10-04T06:38:54Z")

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Ahh, good deal on that link, and the formula!

Thanks!