VintagePorscheG said:This thread is dumb, I have button head bolts and 315 Sumitomos on my stock rims.
Which really shows your stupidity, as two posts above explains that section width varies by tire manufacturer.
Hence, your Sumi's run a little on the narrow side, PLUS you're running them on a rim that is a touch too narrow, which results in the sidewalls pulling in and away from the IRS bolt. Thus, you have no problem especially combined with the button heads.
Thanks for being so helpful :kaboom: