Sasnuke

You wouldn't have any issues with fitment.
Depending on the look you're going for, it won't be flush to the fenders.

CASeoul

Thanks for the answer, what would I need to do to get it to be flush? A spacer for the front?

Sasnuke

For the front a 5mm spacer would get it close. A 10mm spacer may be a little too much if you lower the car in the future.
For the rear a 10mm spacer should be fine.
A suggest getting a pair of 10mm spacers and try them on the front and see how it looks and if there are any rubbing issues...which I don't think there will be.
If there are any issues then throw those on the rear and get 5mm for the front.

CASeoul

Got it thanks, was talking with fitment industries and their guy was saying the 255/40s might rub in the front. They echoed your 5mm/10mm rec though. They said the largest recommended was 235 on the front, but I was pretty sure I'd seen a post where someone was running a similar square setup to I was thinking of.

Think I might just get the wheels first and see what tire I can squeeze in there. I'm guessing anything other than Michelins might work?

I'm guessing they don't have as much experience with front fitments as the forum seems to collectively have.
Thanks again Sasnuke, you're the best.

Sasnuke

I would take the info from Fitment Industries with a grain of salt.
Keeping in mind that anyone at anytime can ask them about wheel fitment on any car, it's had for them to know the entire spectrum of answers.
They likely could provide a very safe fitment without staying too far from factory sizes, but they'll never know for sure that the largest fitment is.
I would have to give them credit though, to have the vast amount of info available is still impressive.

On stock suspension 255/40/18 will be fine. There's another member running literal balloons on his stock rims that make 255/40/18 look small.
However, when you lower it, no guarantees clearances will be the same...since we don't know yet how low it will be.

You could split the difference and go with 245/40/18 in a Michelin, or really any other tire.
The Michelin 245's are fat and will look like a 255 from any other brand.,,and really 245 is a better fit for 8.5 if you're going with a 40 sidewall.
If you're going with a 35 sidewall, then 255 is a better fit.

CASeoul

Yeah that's what I was thinking, they're operating off of what info they've got.

The main reason I'm looking at the 255/40 was just because I wanted a fat sidewall for the pothole ridden roads in the bay.

​​​​​​Any recs for this? 245/40 vs 255/35 is really just a width thing from my understanding, the sidewalls are near identical?
​​​And I'm guessing the 45s would have less rubbing issues?
​​​

Sasnuke

The sidewall is a percentage of the width of the tread.
So 245/40 is a taller tire (approx. 0.7 inches) than a 255/35.
A 255/40 is approx. 1 inch taller than a 255/35.
I get the deal with the potholes, but at the same time you don't want it too look like you're rolling on monster truck tires.
245/40 will give you more sidewall than stock tire sizes, just not as much as 255/40. I think you'll be fine with 245/40.
Really if you need more than that then you need a pickup truck...or move cities.

CASeoul

Ah that breakdown makes it very clear. Sounds like the 245/40 is the way to go. Now for the tire selection process.
People seem very torn between different tires. Need to do some more research.
Really appreciate the help!

sml7781

I was originally thinking about running the setup above but I think a 30 sidewall in the rear will be to thin for the roads around me. The new setup im looking at are Aodhan AFF7 18x8.5 +35 with tire size 235/40/18 up front and 18x9.5 +35 with tire size 265/35/18 in the rear. Do you think this setup will rub? As this is my daily I don't want to do any fender mods. I am thinking 18's as they are a less rough ride than 19's.

Sasnuke

I'm running almost the exact same setup with regards to the specs...the exception being my rear rims are +38 offset.
With my car lowered on RSR Downs I don't get any rubbing...however, I do run Firestone Firehawk Indy 500 tires which are narrow by nature...which I did intentionally for that reason...they are also a really good tire too.
With a +35 in the rear and a beefy tire, if you car was lowered I could see a possible rubbing issue.
At stock height you would likely be fine...but I would still consider a narrow tire to be extra sure.

sml7781

Thanks for the quick reply! I appreciate your input. I looked at your setup specs and wanted to match them as close as possible. I am looking at running Continental ExtremeContact DWS06 Plus. Do you think that is a thin enough tire?

V00D001

The Conti's in that size are the exact same width as the stock 255/35 Bridgestone Turanza's. The total height is only 3/16" more than stock, so that's a wash. However, you're moving the rears wheels out over an inch - it should work but will be close.

Sasnuke

When I look at how narrow a tire is I'm looking at the Tread Width.
Since the front tire isn't going to be an issue, I'll reference the rear tire specs below.

265/35/18 tread width
Conti - 8.9 inches
Firestone - 8.9 inches
Michelin - 9.6 inches

As you can see the Conti is only slightly wider than the Firestone...I included the Michelin as a reference as it's notorious for being beefy.
EDIT: The Conti and the Firestone are the same.

V00D001

Tirerack.com is showing the Conti @ 8.9" which is the same width as your Firestone.

Sasnuke

You are correct...i was looking at the Conti non-plus version which is 9.1 for the rear.