Your car does not have a staggered setup. It is square from the factory. The AWD models are not as lenient as RWD when it comes to tire sizes. It's best to keep it square, but lots of people have staggered setups on their AWD. The general rule of thumb is the front & rear overall diameters need to be within 1% of each other. There's a post somewhere on this forum that outlines known acceptable staggered fitments (blnewt will probably chime in on this and provide the link since I don't have it on hand).


Depending on what kind of look you want, and the offsets of the wheels, you could run either a 225/45/19 or 245/40/19 in front and 245/40/19 or 275/35/19 in the rear (respectively).


This is a helpful tool: Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

 

Here you go ^^^
FWIW Here's the best tire combos I'd recommend for 18s/19s/20s, then pick proper wheel widths/offsets to get them to fit~
18s
235/45 & 265/40 (0.07%)
245/45 & 275/40 -0.07%
255/45 & 285/40 -0.22%

19s
225/45 & 255/40 0.06%
235/40 & 265/35 -0.37%
235/40 & 275/35 0.67%
245/40 & 275/35 -0.52%
245/40 & 285/35 0.51%

20s
235/35 & 275/30 0.07%
245/35 & 285/30 -0.07%

This calculator should be used when trying new setups~
https://www.myg37.com/forums/tire_rim_calculator.php

Keep in mind the variances with a minus sign have smaller rear diameters, this isn't as good since the rears wear faster, this will cause the variance to increase over time. Not a big deal when you're starting at zero or close, but if you're already almost at 1% variance this needs to be considered. None of the above combos should have enough rear wear to be a issue but

 

blnewt, so a 245/40 - 285/35 setup is actually a closer match than 245/40 - 275/35, even with a 10mm wider tire? Now, I'm confused - Again. Is this because the wider tire rotates at a slower rate?

G37xS factory OEM setup - 225/50/18, @ 62.14mph

Relative to OEM specs, the tire calculator quotes:

245/40/19 @ 62.47mph - "0.53 too fast"

275/35 @ 62.79mph - "1.05 too fast."

285/35/19 @ 62.15mph - "0.01 "too fast."

Is there enough clearance on a G37xS suspension to accommodate a 285mm tire width?

 

The sidewall height determination is a function of the aspect ratio (divided by 100) times tire width. The 285/35 is slightly larger in overall diameter than the 275/35, thus the 285 rolls slightly farther per rotation. Compare the stock and aftermarket diameters to see the difference.

 

I understand that. My question is specific to the additional 10mm of width vs a 275/35 - i.e., does a 285/35/19 fit an AWD sedan?

 

yes. i have them on mine. No rubbing going on my third summer with them

 

@blnewt - thanks for posting the 18s, 19s, 20s staggered table. A great summary.

@mdigiorgio35 - you posted what a lot of us noobs are thinking. It's a lot of pages to go through to learn it all when people like blnewt likely have it memorized as general knowledge! ;^)

@VenomGT9 - I've been thinking about staggered on my AWD but your quote "Going staggered on an AWD is always a debate; my opinion is to stick with square set ups, especially in your case." really resonated with me (even though it was directed at mdigiorgio35. I think I should just go Square.

Square = the same on all four tires/rims. If I'm wanting to get as close to the original diameter as the stocks on a 2012 G35x AWD Sedan I should use the calculator at: https://www.myg37.com/forums/tire_rim_calculator.php
When I use that I'm thinking that 285/35/19 is a closer match than 225/40/19

255/40/19 : +1.06%
265/35/19 : -1.68%
275/35/19 : -0.62%
285/35/19 : +0.41%

I see a lot of people doing squares at 255/40/19 though. Any reason to do that instead of doing four 285/35/19s? Does the width of the 285s on the front affect the steering/handling at all vs having 255s on the front?

 

@hashim --- Do you have spacers on there? Can you post some pics?

 

285 is extremely wide for fronts especially on a sedan. I don't think anyone on here is running that setup.

 

Ah, I took from Hashim's post above that he was running 285/35/19 square, but maybe he's just got them on the rear.

 

Noobie questions ahead -- I'm looking at this non-staggered set up, same front and rear:

Alutec Raptr 19x8 (black painted finish) from TireRack
paired with: Goodyear Eagle Sport All-Season 245/40/19
(The Goodyear's are on a 25% off sale here in Canada but not on the 255 size)

Q's:
1) should I do spacers at the same time? Suggestions?
2) Will I see much difference doing these 245/40/19 set vs doing a square set up using 255/40/19 tires?

 

1. Depends on the offset and what kind of fitment you are going for. If you're looking for a flush, aggressive setup, then you probably would want spacers. But it all depends on the offset. If you have the right offset, you won't need them.

2. Not much difference, the 255s will just be a tad wider and taller compared to the 245. But for an 8 inch wheel, 245 would be plenty of meat. 255 may even be too wide for them.

 

Tirerack really sticks to very conservative fitment. If they make that wheel you like in a 8.5 or 9" width or another brand that has a similar style in that width that would be a better mount for a 245 width tire, and wheel offset is also an important spec you should find out. For a 8" width an offset around +30 would be a nice fit, and 8.5 +35, 9 +40. Just throwing that out there, and also a 8.5 to 9" width opens up more tire sizing options. Also with more aggressive offsets you wouldn't need spacers, depending how flush you want to be.

Also like 93 mentioned, the 285 square setup would require a lot of work to get it right (and would probably require some fender work & heavy camber), and your G wouldn't be nearly as nimble and much more prone to tramlining. The biggest square setup I'd recommend would be a 265 all around, and even then your offsets have to be ideal.

 

Thx for the help! I'm looking for a flush, aggressive setup. The offset of these rims I'm looking at is 45mm. I'm thinking I put the rims/tires on, take some pics and come back here for advice.

 

Thx -- so if these rims have +45 offset, and you are saying that around +30 is a nice fit, will +45 be too much? Nevermind -- I think I figured out the answer to that....

I found on https://www.wheel-size.com/size/infiniti/g/2012/ that the offset for a 2012 should be between 38 and 47mm.

Also, I just watched a video on youtube called "HOW TO: Get the perfect wheel offset!" and then went to willtheyfit.com. Using the settings of: 225/55/17 and 17x7.5 offset +45 as the original, I can see that the current diameter is 679.3mm and the new setup would be 678.6mm = .1% speedo error. Perfect. And the new rim would poke out 6.3mm more than before. This should place the edge of the tire as flush (or within 1 mm) with the fender lip.

Thx!