# tire size help

**URL:** <https://forums.speedlife.net/t/tire-size-help/170374>\
**Category:** PittSpeed Off Topic\
**Created:** [November 14, 2004, 11:43am UTC](https://forums.speedlife.net/t/tire-size-help/170374 "2004-11-14T11:43:22Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Silver\_WS6](https://avatars.discourse-cdn.com/v4/letter/s/c0e974/32.png) [@Silver\_WS6](https://forums.speedlife.net/u/Silver_WS6)\
**Post date:** [November 14, 2004, 11:43am UTC](https://forums.speedlife.net/t/tire-size-help/170374/1 "2004-11-14T11:43:22Z")

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stock is 275-40-17 i have 225-60-16 on now how much of a tire height diff am i looking at ?? there was a website once but i cant find it… thanks

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**Author:** ![ShalerPunk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/shalerpunk/32/5976_2.png) [@ShalerPunk](https://forums.speedlife.net/u/ShalerPunk)\
**Post date:** [November 14, 2004, 11:48am UTC](https://forums.speedlife.net/t/tire-size-help/170374/2 "2004-11-14T11:48:51Z")

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> [@Silver\_WS6](#):
>
> stock is 275-40-17 i have 225-60-16 on now how much of a tire height diff am i looking at ?? there was a website once but i cant find it… thanks

.9" difference in diameter…

your speedo will read 3.8% too slow

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

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**Author:** ![Silver\_WS6](https://avatars.discourse-cdn.com/v4/letter/s/c0e974/32.png) [@Silver\_WS6](https://forums.speedlife.net/u/Silver_WS6)\
**Post date:** [November 14, 2004, 11:51am UTC](https://forums.speedlife.net/t/tire-size-help/170374/3 "2004-11-14T11:51:26Z")

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thanks thats the site i was looking for !

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**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\
**Post date:** [November 14, 2004, 11:52am UTC](https://forums.speedlife.net/t/tire-size-help/170374/4 "2004-11-14T11:52:02Z")

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depends on wheel size also!

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**Author:** ![tjZ28](https://avatars.discourse-cdn.com/v4/letter/t/9de0a6/32.png) [@tjZ28](https://forums.speedlife.net/u/tjZ28)\
**Post date:** [November 14, 2004, 11:54am UTC](https://forums.speedlife.net/t/tire-size-help/170374/5 "2004-11-14T11:54:05Z")

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NM Shaler found it.

-TJ

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**Author:** ![Silver\_WS6](https://avatars.discourse-cdn.com/v4/letter/s/c0e974/32.png) [@Silver\_WS6](https://forums.speedlife.net/u/Silver_WS6)\
**Post date:** [November 14, 2004, 11:54am UTC](https://forums.speedlife.net/t/tire-size-help/170374/6 "2004-11-14T11:54:40Z")

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well just to get an idea of how off my mph is when im on the highway its cool  
btw they are S rated !!! than means stay below what mph ? ive gotten to 110 or so but i dont think that was smart

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**Author:** ![The1SloR\_T](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/the1slor_t/32/5984_2.png) [@The1SloR\_T](https://forums.speedlife.net/u/The1SloR_T)\
**Post date:** [November 14, 2004, 4:18pm UTC](https://forums.speedlife.net/t/tire-size-help/170374/7 "2004-11-14T16:18:58Z")

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its easy for me to set my mph on my speedo, all i gotta do is hook up my scan tool and it shows my mph then take my lego dash apart and pull the needle and reset it, takes 15 mins for me 🙂