# Tire Size on Rim Size

**URL:** <https://forums.speedlife.net/t/tire-size-on-rim-size/75>\
**Category:** NYSpeed Automotive\
**Created:** [June 17, 2005, 8:40am UTC](https://forums.speedlife.net/t/tire-size-on-rim-size/75 "2005-06-17T08:40:07Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Ninja](https://avatars.discourse-cdn.com/v4/letter/n/53a042/32.png) [@Ninja](https://forums.speedlife.net/u/Ninja)\
**Post date:** [June 17, 2005, 8:40am UTC](https://forums.speedlife.net/t/tire-size-on-rim-size/75/1 "2005-06-17T08:40:07Z")

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I knew I heard this somewhere before but I need to clarify. I got RSX 5-Spoke rims… I need to know what is the widest I can put on there… I wana say they are 7.5" or am I still thinking formula tires?

I thought a 225 would be safe… but wasn’t positive… anyone know?

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**Author:** ![Adictd2b00st](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/adictd2b00st/32/7625_2.png) [@Adictd2b00st](https://forums.speedlife.net/u/Adictd2b00st)\
**Post date:** [June 17, 2005, 8:43am UTC](https://forums.speedlife.net/t/tire-size-on-rim-size/75/2 "2005-06-17T08:43:04Z")

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i have 225’s on 7" wide rims on the 240 up front, and they fit without any problems. i also have 255 crammed onto the rears so u should be fine

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**Author:** ![Tevenor](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@Tevenor](https://forums.speedlife.net/u/Tevenor)\
**Post date:** [June 17, 2005, 9:11am UTC](https://forums.speedlife.net/t/tire-size-on-rim-size/75/3 "2005-06-17T09:11:25Z")

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rule of thumb is 70%. The rim size width doesn’t want to be any smaller than 70% of the tire width. I personnally try to shoot for over 80%.

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**Author:** ![RuBiCaNT](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rubicant/32/7622_2.png) [@RuBiCaNT](https://forums.speedlife.net/u/RuBiCaNT)\
**Post date:** [June 17, 2005, 9:12am UTC](https://forums.speedlife.net/t/tire-size-on-rim-size/75/4 "2005-06-17T09:12:44Z")

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Word. 225 is probably as big as you want to go without sacrificing performance on a 7" wide rim. I have 17x8 and 235/45/17. One thing to remember, get a general range of section widths because some tires are wider for 225 than others. For example:

Kumho Ecsta MX 235/45/17 section width is 9.4"

Goodyear Eagle F1 GS-D3 245/45/17 section width is 9.4"

So, some tires might fit on that rim and some not as well. WTF do they have standards for when they aren’t the same, I don’t know.

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**Author:** ![MaximaSE98](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/maximase98/32/7600_2.png) [@MaximaSE98](https://forums.speedlife.net/u/MaximaSE98)\
**Post date:** [June 22, 2005, 6:31pm UTC](https://forums.speedlife.net/t/tire-size-on-rim-size/75/5 "2005-06-22T18:31:51Z")

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i put 245s on my 7.5" wheels…they were fine