# Tire Size/Rim Size Question. **URL:** \ **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:** 8
**Author:** ![Bravada\_442](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bravada_442/32/5982_2.png) [@Bravada\_442](https://forums.speedlife.net/u/Bravada_442)\ **Post date:** [March 21, 2007, 1:43pm UTC](https://forums.speedlife.net/t/tire-size-rim-size-question/188697/8 "2007-03-21T13:43:54Z")
> [@i have to poop](https://forums.speedlife.net/t/i-have-to-poop/28927/15): > > KeithO’s right, check out the specific tire you’re looking for on Tirerack. You’ll find the ideal rim width for that tire, as well as a range of what the manu says can be safely mounted… I did. I, for instance, decided to look up a 235/45/18 to see what it would be like. A goodyear in that size only would “work” on a 7.5 to 9, but a 235/50/18 would work on anywhere from 6.5 to 8.5 How can 5% of sidewall make an INCH difference in how the tire will fit? That just seems stupid to me. --- _[View the full topic](https://forums.speedlife.net/t/tire-size-rim-size-question/188697)._