i want to put 235/40-17s on 7.5" wheel. on a couple of websites they say that you should not use this size on anything less than a 8" wide wheel. but i have heard of using an oversized tire on a smaller size rim but you have to run more air in it. does anyone have some advice or words of wisdom (based on fact not opinion please)?


thank you,


yo!

 

I agree that you should use an 8" wheel for a 235/40 tire. It's not the width that's the issue, but the aspect ratio.

It's best to have the rim width be at least 85% of the tire's section width, when using low profile (<50 series) tires. For aspect ratios of 50 and above, the rim width only needs to be 70% of the tire's section width.

Here's a link to one reliable source (I think they'd know what they're talking about) that makes this claim, if you'd like to read more.

 

thank you for the informative post.