# Tire Size/Rim Size Question.

**URL:** <https://forums.speedlife.net/t/tire-size-rim-size-question/188697>\
**Category:** PittSpeed Automotive\
**Created:** [March 19, 2007, 1:29pm UTC](https://forums.speedlife.net/t/tire-size-rim-size-question/188697 "2007-03-19T13:29:12Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![KeithO](https://avatars.discourse-cdn.com/v4/letter/k/4bbf92/32.png) [@KeithO](https://forums.speedlife.net/u/KeithO)\
**Post date:** [March 21, 2007, 3:00pm UTC](https://forums.speedlife.net/t/tire-size-rim-size-question/188697/10 "2007-03-21T15:00:33Z")

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> [@Airflow through a grill for a fmic, need answers](https://forums.speedlife.net/t/airflow-through-a-grill-for-a-fmic-need-answers/28926/15):
>
> How can 5% of sidewall make an INCH difference in how the tire will fit? That just seems stupid to me.

It’s not just the height but the aspect ratio plus the thickness and materials used in the sidewall itself.

The way I look at it is that I will go with the manufacturer’s spec on things like this - I’m sure the tire manufacturer’s legal department had a say in what they considered safe and have these specs to avoid lawsuits and warranty issues.

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