Im on bc coilovers and stock base wheels, here are some pics for better look

https://preview.ibb.co/nAp1KQ/20170916_184412.jpg

https://preview.ibb.co/m4cJYk/20170916_184428.jpg

https://preview.ibb.co/bsubKQ/20170916_184444.jpg

https://preview.ibb.co/iyunR5/20170916_184456.jpg

You got 20/25mm F/R spacer's on the 18" base wheels in those pic's?

Yessir

You got room to play with on front for sure,,,being lowered; chances are your camber is a tad more negative in front than what comes from factory-so you can get away with a more aggressive wheel.
Those factory wheel's are 18x8+43/18x9+15
Your spacer's made them 18x8+23/18x9-10
Your front wheel lip's will sit right at 1/2" further out than pictures w/20mm spacers.
Rear's will virtually sit in the same place as pic's w/25mm spacer's.
Depending on your taste-you should have room to swap spacer's around & see what look's best to you.

I'm stock ride height & right at -1.0 camber all around,,,from a front view; the wheels will appear to stick out more than from rear view; fenders curve inward on front....unsure if it's as much on newer body's.https://uploads.tapatalk-cdn.com/201...357f5b39d1.jpghttps://uploads.tapatalk-cdn.com/201...57497ddee4.jpghttps://uploads.tapatalk-cdn.com/201...fd0c421f12.jpg


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Your wheels are the f14's forgestar? So you have 19x9.5 +20 front
19x11 +15 rear correct? That's why you don't need spacers. I think yours stick out more than mines. What size of tires do I need for aggressive? I don't think I will need those apr extended studs with the spacers right? I just don't want the tires to be sticking out like a riced out civic

No, Mine are 19x10F & 10x12R +38 offset on both,,,should be in my signature.

usually the 20,25mm spacers come w/studs & they just bolt up to the hub's & your wheels bolt to them....Z1 has many options...& for tweaking..they offer 5mm,3mm,2mm i think...they get pretty thin w/them.

your rear tires look wide as hell. do you think I can use a wider tire like yours with my new wheels?

A wider tire will go on a 9.5" wheel; though the 9.5 is optimum for the 275 width tire.
Best way to spec wheels, is to tune suspension first & then measure your inner clearance to most likely contact point.
You can then determine about how much wheel will fit (as you have coilovers) and then pick from various sized tire's to work for you. (Height/Diameter/etc.)
Best to keep the diameter close; as if you're too tall F/R, you will have multiple warning lights illuminated on dash & reduced power...I'd recommend 2% max differential & I prefer a slight rake (rear tire's a bit taller than front), though some people have pushed out closer to 3% & some choose a negative rake (front's taller than rear)...as our base Z's came with 26.7"R,26,9"F.
Have in mind what brand & performance catagory tire you're looking at; cause they will differ by mfg.
This is how custom offset wheels are determined.
Also never hurts to scroll back a few post & look up the [official 370z] fitment guide...tons of pics/specs/setups that others are running & alignment specs and any issues you've having.
Endless setup designs for these cars w/massive wheel wells.

245/40 & 275 or 285/35 are your best choices & closet to oem diameter.
You initially listed 245/35,275/35...may cause multiple warning lights (Christmas Tree effect) with this much difference in diameter.
You can go shorter if you desire; a 35 series up front & 30 out back.

Anyone know if the Rays Gramlights 57transcend will clear akebono brakes with no spacers?

19x9.5 +25 / 19x10.5 +20

Yes, these clear the Akebono Brakes without spacers. These are also an easy fit. You can run nice size tires without having to roll fenders either. :driving:

Hi Everyone, I picked up a set of f14 wheels for cheap locally, but theyre rubbing pretty bad, just wondering what people here may have done to get it to be fine. Front specs are as follows:
19x9 +12 sitting on 275/35/19 Rs3. Rubs on bumps. I've installed FUCA, but haven't gone for an alignment. Will I need to roll fenders?

I'm lowered on Swift springs.

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Roll the fenders to be safe

An alignment will cure most of it, tech should be able to increase negative camber

Yepp will do, thx!

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If you can, switch up the tires. The 275 RS3s are a huge tire and run kind of wide, especially on a x9.0 wheel. Would fit better with a 255 or even 265 different model tire. You possibly may not even have to roll.

Yeah the brand of tires are going to make the difference there. I'm running 19x9.5 +12 up front with same size tires but they are Forehawk Indy 500 and the sidewalls aren't as square and pull in a little - just enough to make that difference. And I've got Nismo flares on so even less clearance than you do.

If you've got adjustable upper control arms you can also dial in a bit more -camber when you do the alignment. Wouldn't take much more if they only rub on bumps.

with the SPL FUCA, you can do virtually anything up front depending on your effort/comfort level with negative camber

Rolling a fender isn't a big deal if you have any sort of competent shop. Apply heat and pressure gradually and there shouldn't be any damage to your paint.

I agree 275 on a 9 inch rim is wide - i misread your sizes and thought it was a 9.5, thats a bit wide. I'm running 275 on an 11, its a minor stretch.

That's a bit more than minor....🤔

Really it's not, but i suppose you're coming from a different place.

Yea, the not stretching tires place :tup:

MaysEffect,
How stretched would a 305/30 Michelin PSS be on a 19x12" wheel?

I refer to that place as shitty wheel fitment

Such a nice place to visit :icon17:

equally as much as a 275 on a 11". If i was going to stretch that, i'd put a 305/35 on and not a 30profile.

oppose to scraping the rim on everything because you have no sidewall protection? :confused:

Is that a joke? If i scrape my rim on a curb thats would be due to bad driving, not a tire/wheel sizing choice

my wheel fitment is for my own aesthetic. if i'm going to a track, i'm putting on different set of wheels

i'm sure as hell not gonna pick a tire size for "side wall protection"
seems like a pretty simple solution

if you want a different look for your car, cool, whatever your money

but please don't come with "oh no my rim might get scraped up"

lol,,,i make it a point not to bump curbs.
Also your sidewall comment is off.....lower series tires fit wider wheels better.

:confused: What's you talkin' 'bout Willis?

Some tires, like RE11 are specifically designed sidewalls to offer some rim protection.

:tiphat:

yea...that's not even remotely accurate lol.

yea and that only works properly if the tire size matches the wheel size accurately...

Yea...and you wouldn't scrap the rim on a curb as bad if you had more tire protection :tup:

Also i assure you, with enough cornering force and the right bump, you can easily hit the rim under normal driving conditions if you have a tire that is too small and too stretched.

And i'm not talking about your specific setup, but excessively stretched tires in general. If you are using a 275 on a 11" wheel, i agree that's not extreme, but you said minor, and that IS a relatively wide stretch. It may not be full ricer stance boi stretch, but it is a bit excessive.

I don't know if this is dumb question but why would someone want to run a 275 on an 11" wheel? Just because they like the stretched look? If I'm buying wider wheels it's so I can run wider tires. My question would be, what is the widest tire I can run on an 11" wheel, not what's the narrowest tire I can run on an 11" wheel? :icon17:

Depends on the tire mfg. I have 345/30/19’s in the Nitto Invo; mounted on 12’s & they’re actually a tad stretched vs. the 285/35’s on 10’s up front.
The tires section width can vary 1” easily on identical sized tires w/different mfg.
In the PSS/PS4S,RE11 or Continental extreme contact-325/30’s are good fitment.
You can run the 345/30 Invo’s on an 11; as they’re 1/2” narrower than the PSS & 1” narrower than the C1 cup tire’s.

Not dumb at all. There are valid reasons to stretch a tire, one is wheel fitment. A 11 inch wheel can give a better offset and spoke concavity. But the downside is the optimal tire height/width won't clear the fenders. Smaller tires will tuck under the fender.

Companies do it from factory to actually reduce sidewall flex and improve immediate steering response. This has been established for years*. Most notably our cars. 245 on a 9.5 wheel, 285 or 275 on a 10.5".

Largest tire you should run a 11" wheel is a 325, optimal is a 315 or 305.

May’s - you gotta get more trial & error experience.
I’m running 295/55/20’s on my Tahoe w/ factory 8.5” Wheels.
I ran 305/70/16’s for over 200k on factory 16x7” Wheels.
I’ve seen 345/30/18’s on 10.5 Wheels.
Oem “stretches” 245/40’s on a 9.5” front Nismo.
Just because Tire Rack gives you a range of wheel sizes/ doesn’t mean you can’t go up or down a bit.
I mount 520/70/34’s,17.5x25’s,14x24’s,255,275,295,385,425’s on 22.5 Wheels on regular basis...many more not listed.
When you are performing the work “Yourself” & not paying to have done or reading what works best,will only get you in the hall field.
Again-it’s how you desire the look & what’s appealing to the individual.
As far as a 275 on an 11....look at what the 4sec. 1/8th Mile car rear wheels are w/275 drag radials.
I have 35yrs. Experience in this field & still learning....please don’t bash guy’s on here; as some have lots more than myself.

I'm not sure you read what i said correctly if you think I'm bashing anybody. I just gave valid reasons why you could stretch a tire. I've tried several tires and tire fitments on cars already in my short time driving. I don't need to try unaccesary tire fitments if i understand and know what is optimal for the rim size and cars space and weight. I spend a lot of money on my tires, I'm not gonna trash them by not getting the best handling, wear and feedback from them because i decided to go too large or too small. Function is significantly more important to me and some people than visual appeal, and personally i don't think there is anything visually appealing about a incorrect fitment. I respect everyone's personal choices certainly when they have no bearing on my life. But this a forum about sharing ideas. I'm not gonna suggest something that's flawed by design and guidelines. PROFESSIONAL GUIDELINES.

Optionzero even agreed he personally does it for aesthetic value and if he was to "track" his car, he would put a more optimal tire setup on. I personally drive spiritedly all the time, so i know i need the most functional fitment 24/7. Using the wrong tire size has downsides to handling and wear. I'm sure many will agree and know this to be true. So why should i suggest to anyone or experiment with the incorrect size? There is plenty of information out there with the CORRECT guidelines to go by. The one consistent bit of information is using the optimal sizing. Not "experiment until you get it right". If that was the norm, people would be wasting money left and right getting it wrong. I don't suggest people live like that regardless of how much time and money you have to waste.

Drag radials for those fitments come with massive sidewalls, not tiny low profile sidewalls that will not deform or stretch properly. This is a huge difference from stretching a 275/30 on a large 19+ wheel. And most of the time you still use the correct rim size. In any case drag radials are still not ideal for normal driving conditions, so it's rather irrelevant.

Your trucks you describe also use large sidewalls, and just because you are getting away with it, doesn't make it optimal. You'd unquestionably have better steering response if you were using the optimal size for the wheel. A 305 on a 8.5 wheel is excessive regardless if it works.

Good Reply May’s