Figured it out.
thought there was another reason besides the tires over all size of the tire. 275/40/18 will work for all four corners no prob :D

wheel question: If I decide to purchase a set of forgestar f14 wheels (the polished copper version is calling my name!!) do I need to get longer wheel studs as well, or will the new wheels and lugs be safe on the OEM studs? My Z is a new 2018. I have read that some aftermarket wheels do not allow a safe amount of grab for the lug nuts on the OEM studs and just want to know all that will be needed to use a set of F14's.

skidro

I have f14s, did not change studs, but you'll need aftermarket lug nuts as the oem will not fit or sit properly.

I use project kic r40 lug nuts.

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Yes...... knew I would need new lug nuts as well, but was just concerned about length of factory stud being sufficiently long enough. I take it you have had no problems using the F14's on the stock studs and had plenty of stud length for the new lug nuts?

skidro

Yes, I'm not using any spacers, and had plenty of turns on the stock studs. As long as you get the recommended specs (width and offset), you'll be fine on stock studs.

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Hey guys,

I'm looking to grab bigger rear tires on the 2015 stock 18's oem tires.
.
Here is the plan:

Move stock rears to the front and buy x2 g-Force COMP-2 A/S 275/40/18's for the rear (need all season to finish up the last couple months left of winter here). The only other options for that tire is 255/45/18. They seem to get great reviews even in light snow.

My questions:

Will I get better grip with the wider rear tires? Especially on cold streets.
Will the driving/handling be drastically affected?
Will this look good on stock suspension (fitment/fender gap/bubble)?
When I get swift spec R springs, will these tires still fit all the way around?
Can I still add spacers with that set up (including springs) without rubbing?

Also, if you have better options as well as spacer specs, feel free to chime in.

Thanks guys.

P.S. I think I posted this in the wrong place before, so my apologies for the double post.

245/45,275/40/18 is uniform & looks good on the 8,9” Wheels.
Ride quality should be better (pending tires)
Traction will be similar-I ran the 225/50,255/45 combo for the function (cold & ugly winter weather)...but dang them tires are skinny.
Ride quality increased for me with fatter meats-but there’s a trade off on fuel consumption and cost....but you’re not getting close to that ballgame w/245/275’s.
Try to keep same tread compound for best traction & handling.

Excellent. Thank you so much for the response. I'm definitely going that route.

Do you know if you can drop it 1.2" using that same setup without having rubbing issues?

Also, with that drop and wheel/tire combination do you have any spacer experience/advice? I actually like the stock 18's, I just want to close the fender gap.

This is an old picture with 20mm front & 5mm rear spacers...you may want to lower it before you purchase spacers/so you’ll be more accurate when measuring for them.
Unsure if you’re purchasing all required parts to keep your alignment in check.https://uploads.tapatalk-cdn.com/201...abf2d55985.jpg


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Just ordered my works....

9.5" +10 front
11.5" +15 rear

Im expecting around -3 rear camber on 315s

Hoping for a bit of input. I just picked up a 370z Nismo, and ordered (deposit sent) some wheels. Still trying to nail down the offset....this is what the supplier is looking at:

F 19x9.5 +23 265/35
R 19x11 +18 305/30

Looking at lowering via RS-R coilovers, at about a 1" drop. Wanting to keep camber at rear in the OEM range, but on the higher end (closer to square), as I will be putting a turbo kit on it right away. This of course is for traction purpose.

So, in other words, looking for the "square" look.

Thoughts?

Thank you very much...not my area of expertise, so it is nice to get some input from those that know this much better than I do.

I’m no expert on coilovers or lowering or the amount of clearance on backside of Wheels requiring the coilovers.
But I also ran the more upright camber on my Z,, roughly (-0.8 to -1.0) Front & Rear.
My Wheels are tight on backside w/7” backspace Front & 8” backspacing on rears...very close (finger tip) at all pinch points.
But the front spacing (hub face to outer wheel lip) is 4” on front & 5” on rear’s...your front spacing is just over that at 4.36” & 5.29”...not bad; as you will need more clearance on backside & your tires will be a more square/stretch look than the 285/35,345/30’s I have on 19x10’s,12’s....I’m sure you can dig through this thread or through the [official 370z] wheel fitment thread & find one close to what you’re looking for.
You may want to set your suspension up & then measure up for wheel offsets.
As my goal was to maximize backside & tuck as much underneath fender as possible/ while tuning Wheels more upright.
You’re in the ballpark with what you are posting: it’s just how ocd you’re gonna be with it.
Good Luck & here’s a small pic of mine.
19x10,12’s +38 offset w/https://uploads.tapatalk-cdn.com/201...6801fcb5e0.jpg285/35,345/30 Nitto Invo’s


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^^^^Thank you...yeah, I'v been reading and searching for two days straight. I think I'm at a point where I am just starting to confuse myself even more.

May be time to take a break from offset searching.

Your sizes will fit fine. refer to this post here:


NOTE that a 11 inch wheel +18 is the same outward spacing as a 10.5 +12 so your wheels will sit the same from the outside.


Get some SPL arms and you can fit anything, especially since you aren't aiming to go low. I have a 20x12 +20 wheel with a 315/25/20 tire and approx 2 deg camber. There is room to spare.

The Z has essentially infinite clearance. You would be hard pressed to find something that won't fit if you are willing to do a few small things like a fender roll and suspension arms. (Big things to me are negative offsets, overfenders, and extreme stretch)

Thank you, and yes, that is one of the vehicles (wheel specs) I used to derive some of my decision making. It is the look I am going for.

I have already ordered the SPL gear, so it sounds like I'm well on my way.

The "Will it fit?" thread
 

Anyone running a 255/40/19x9.5 & 295/35/19x11?

Currently on 245/40 and 285/35, and looking for a tad more width, but not going for meaty.

Critique away... Thanks

Seems tall. 27 and 27.1 inches overall diameter. Slightly above stock diameters

Roll those fenders and you are good for anything. Go 325 in back, GTR level

Thanks. No need to roll anything on the NISMO's, but I'll probably have to trim the plastic fender trim on the inside. May just remove the altogether.

I'm rolling on 285/35-19 PS4S and 345/30-19 PSS, on 19x9.5 +25 and 19x12 +28. :tup: You're going with a 1 inch drop. Then you would want 275/35-19 and 325-30-19.

Yeah that’s what the math says but figured it would actually be about the same... Someone please correct my warped thinking if it is so.

Check this out: I propose that

245/40/19x9 & 285/35/19x10.5

Would be the same dimensions (roughly within a couple MM height/circumference wize) as...

255/40/19x9.5 & 295/35/19x11

Comparison based on OEM Nismo Rays Vs 19x9.5 & 19x11.

Am I crazy?

11.5" wide wheel....what tire

Iv done my searching on google, with a couple results and searched here with 11.5" wheel as my phrasing, with no luck.

Seeing if someone here might have a recommendation or a link. Im not looking for meaty, closer to a 315/25 tire but yeah, Im having trouble finding that. Maybe even a 325/25.

You will want a 325/30/19 tire on an 11.5" rim for the rear. That is what I run.

This is what I run. -1.5 for camber on the rear. I could do -1.2 if needed.
the inner fender liners do rub a little. I have some small trimming to do.

http://www.the370z.com/wheels-tires/...thread-38.html

taking a look at your car now :)

I dont know man, Id prefer to drop the car right at tire level or slightly below. Ill also be running around -2.5 camber. My offset will be +15. At least those are the specs I hope will get me the look I desire.

Are PCD Adaptors safe? IE H&R do a 5X120 to 5x114.3 20mm PCD Adapter. (Wanting to use some alloys I bought and had drilled for my BMW on the 370Z)

I have not heard of many people using these and would appreciate some input

Thanks!

You should be fine with a 285 to 325 size tire.

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285 seems like a bit of a stretch but Im still considering 305/30s though.

Lol, it is but can be done. I wouldn't do it! I run 315/30 on an 18x11 wheel.

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well yeah...we've all seen some stupid *** sh*t. Im not interested in being an idiot. I just want a safe tire size that has this kind of "arrangement" on the wheel. Im the kind of person that wont run anything smaller than a 275/30 on a 10.5" wide wheel.

I have a new pair of 305/30's & 325/30's in Michelin PSS's & they measure a tad wider than what the Rack has posted...right at 12.75" section on the 305's & 13.5" on the 325's.
Either will fit the 11.5" wheel,,,just additional 3/8" of rubber off each side of rim w/325's

You want a that low rider look. I want the, I can put the power to the ground look. The camber was more negative in the picture. My alignment was off some. My post was for Boosted Performance anyway.

Pics not very good; but an unmounted 325/30/19 is wider than a Nitto Invo 345/30...both are lying flat on floor.https://uploads.tapatalk-cdn.com/201...d21e17fd3d.jpg


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for sure, your feedback was helpful though, no doubt about that.

thanks man, yeah Iv done a lot of reading that tire model and make can make a big difference. I was looking at Michelin pilot sports from the get go so the info is helpful for sure.

I can provide some more pics & measurements if needed.
Recovering from accident & gets bored sitting around house- I got them in the house with me staying warm.

I could go lower if I wanted too. You could make my size fit perfect lowered with all the SPL adjustments I have. You can make just about anything fit perfect. Compared to the stock Nismo wheels I am +7 rear and +17 front from what I remember.

Here’s 2 stacked on top of each other.
25.5” for 305’s & 27” for 325’shttps://uploads.tapatalk-cdn.com/201...4762f9d70b.jpg


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Im not gonna say no man, its all gonna help me. Im so use to dealing with 9.5/10.5 wheels. This aggressive setup Im going with on the car is new to me. I can only spend so much damn time on google.:tup:

The bead design on the 305’s are actually a bit inward with a bead guard ... more designed for a 10.5 or 11” wheel.
The 325’s are for 11 & up.