# Tire size calculators

**URL:** <https://forums.speedlife.net/t/tire-size-calculators/120260>\
**Category:** SON240sx Automotive\
**Created:** [December 1, 2008, 3:14pm UTC](https://forums.speedlife.net/t/tire-size-calculators/120260 "2008-12-01T15:14:52Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![bing](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bing/32/7211_2.png) [@bing](https://forums.speedlife.net/u/bing)\
**Post date:** [December 19, 2008, 1:05pm UTC](https://forums.speedlife.net/t/tire-size-calculators/120260/6 "2008-12-19T13:05:06Z")

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> [@mazda speed 3](https://forums.speedlife.net/t/mazda-speed-3/19218/50):
>
> [Discount Tire Direct now partners with Tire Rack](http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTireMath.jsp)
> 
> For those sizes, it says:
> 
> If your speed reads 65 miles/hr, you will in fact be going 64.5 miles/hr.
> 
> So yeah, not much of a difference at all.

FYI, that calculator is awesome… exactly what i needed and i’ve used it a dozen times since… good link.

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