# Wheel/Tire Size Differences Calculator

**URL:** <https://forums.speedlife.net/t/wheel-tire-size-differences-calculator/244315>\
**Category:** Shift518 Automotive\
**Created:** [May 22, 2009, 6:15pm UTC](https://forums.speedlife.net/t/wheel-tire-size-differences-calculator/244315 "2009-05-22T18:15:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Cossey](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@Cossey](https://forums.speedlife.net/u/Cossey)\
**Post date:** [May 22, 2009, 6:15pm UTC](https://forums.speedlife.net/t/wheel-tire-size-differences-calculator/244315/1 "2009-05-22T18:15:02Z")

</div>

[http://www.geocities.com/xtremephoenix/tire.htm](http://www.geocities.com/xtremephoenix/tire.htm)

Very helpful tool. It’s setup now for Porsche 996TT I believe, but you can change the gear ratios for your car and get the right info.