No way that first Miata has 17x7s with those Advan AD08s. 99% sure they are at least 17x8s. Ive seen that picture before.
If you have 17x7.5s, I would not go 235/40, especially if you go Federal. They are just too wide. And when you put that oversize of a tire on a wheel, you will in fact lose some performance out of it. The sidewall will want to roll over on itself, and the handling can feel a bit soft and mushy. 215/45 will be plenty, and the slightly higher sidewall will really help fill in the fender gap.
I had 215/45/17 Federals on my 17x8 5Zigen FN01R-Cs in the past.
You can see on an 8in wide wheel they are almost square. So on a 7.5 they would be completely so. Plus, these are the regular SS595.
I now have 235/40/17 Federal RS-RR on my 17x9 an 8.5 Volks. And as pictures show, they are nearly square, which for a 235 on a 9 almost NEVER happens. I measured them and they are wider than my previous 245/40s I had.
8.5s: perfectly square sidewall
9s: every so slight stretch (can't even really call it a stretch though), which can actually help stiffen the sidewall, and improve handling and steering response.
If you have 17x7.5s, I would not go 235/40, especially if you go Federal. They are just too wide. And when you put that oversize of a tire on a wheel, you will in fact lose some performance out of it. The sidewall will want to roll over on itself, and the handling can feel a bit soft and mushy. 215/45 will be plenty, and the slightly higher sidewall will really help fill in the fender gap.
I had 215/45/17 Federals on my 17x8 5Zigen FN01R-Cs in the past.
You can see on an 8in wide wheel they are almost square. So on a 7.5 they would be completely so. Plus, these are the regular SS595.
I now have 235/40/17 Federal RS-RR on my 17x9 an 8.5 Volks. And as pictures show, they are nearly square, which for a 235 on a 9 almost NEVER happens. I measured them and they are wider than my previous 245/40s I had.
8.5s: perfectly square sidewall
9s: every so slight stretch (can't even really call it a stretch though), which can actually help stiffen the sidewall, and improve handling and steering response.
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