235/40 better than stock tires?
if you push the limits, you may have a larger sidewall than you want, or some fitment issues.
I would pick a tire you want, and find out what rim width they recommend and use that.
If you want to push it, use the upper/lower limits of the tire spec width range.
But i would never go out of the range.
This is all based on what tire you want. Start there.
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