szymonf

Hi guys, new to offset questions and have googled and searched for a few days and maybe I'm just not happy with what I read or need a different point of view...

I have an 07 gt, I have some 20x11 tsw lagunas that came with the car, fit well but are heavy. Tires are done and in stead of re wrapping I'm swapping wheels to 18x10 square which should save me some dough on the tires (mich pilotsupersport)

I want to run meaty tires thinking of 275 or 285.

The wheels I am looking at are 18x10 but have a +32 offset. I'd prefer not to run spacers and am wondering how sunk in will these wheels be and can I fill the gap with rubber a bit? I am not a stance person so I don't need to be hella flush but I just don't want it to look brutal.

Also if I am running 275 how tall can I make sidewalls without brutalizing functionality. The car is only a for fun car and will be having first track day in a couple of weeks.

Thanks for any help!!

PP08HR

iTrader: (2)

In for answers!

travlee

iTrader: (8)

might find some answers here

https://my350z.com/forum/wheels-and-...-this-rub.html

szymonf

Lowered eibach springs
Currently 285/30 r20 and presuming +40 offset from research but not sure (discontinued wheels tsw laguna - cant find exact specs)

I'll read through but I don't think it's a rub issue! Thanks!

szymonf

that might be useful...

travlee

iTrader: (8)

this might help ya some on the rears

szymonf

Is the difference between +15 and +32 huge other than the obvious answer of 17 mm lol ... Like visually from anyone's experience

MicVelo

Best to use this handy tool: https://my350z.com/forum/tire_rim_calculator.php

Plug in the standard sizes (width and offset) for your model 245/40-18, 265/35-19 and work from there.

OR

Measure the offsets of the wheels on the car and use those figures to get a better perspective of what the new wheels will do (go inboard/outboard) if you choose those offsets.

Heightwise, just looking at my tire spreadsheet (I gave up pulling out a calculator or using the tire calculator every time I considered tire sizing ) and comparing to stock Grand Touring/Nismo sizing, the best sizes (again, HEIGHT only) are:

Front: Stock height is 25.72", take your pick:

245 40% 18 25.72
255 35% 18 25.03
255 40% 18 26.03
265 35% 18 25.30
265 40% 18 26.35
275 35% 18 25.58
275 40% 18 26.66
285 30% 18 24.73
285 35% 18 25.85
285 40% 18 26.98
295 30% 18 24.97
295 35% 18 26.13
295 40% 18 27.29

Rear: Stock height is 26.30", take your pick:

245 40% 18 25.72
255 35% 18 25.03
255 40% 18 26.03
265 35% 18 25.30
265 40% 18 26.35
275 35% 18 25.58
275 40% 18 26.66
285 30% 18 24.73
285 35% 18 25.85
285 40% 18 26.98
295 30% 18 24.97
295 35% 18 26.13
295 40% 18 27.29

General rule of thumb (FOR STREET USE) is to try and keep your tire within about -0.2 to +0.50" from stock and if you raise/lower front, add/subtract from rear as well. Or vice versa. This keeps your speedo - and VDC if applicable - happy. On the track, it's not as much of a concern as your speedo is second priority to the tach and hopefully VDC is turned OFF.

Personally, if I were looking to fill out the well WRT "sunken" vs "poked", I'd select the correct offset first. That's the proper way to do it. Tire sizing can vary, wheel size, not so much once you have 'em.

Another FYI, you CAN fit up to a 295/35 without rolling on a slightly lowered car. Yes, I've done it with nary a rub (because a set of wheels I bought had 'em on there, not because I chose 295s)

szymonf

yea sorry I kind of hijacked my offset question with the tire question.

I was just hoping I could create an optical illusion with the tires!

so is +32 pretty far from where it should be?

szymonf

referring to that comment the rest was kick ***! shake and bake baby

MicVelo

No. Most OEM wheels for Z33 are +30mm offset with a few that deviate by a few mm +/-.

More "aggressive fitments" (most popular anyways) tend to be in the +15 to +20 range, some requiring minor fender work, depending on suspension and tire choice.

Was going to put up pics to show you what differing offsets do but remembered this thread/post:

https://my350z.com/forum/wheels-and-...l#post10605863

Should give you a better perspective.

Cheers,

Mic

szymonf

Thanks a lot guys I'll post up once I get everything on

MicVelo

In addition, what I said earlier about measuring your existing wheels (TSWs) is the best thing to do so you can "visualize" offset changes.

Do you know how to do this? If not, do this:

- Remove the wheel and take a measurement across the wheel (the width as it were). You said they were 20x11" so your measured width rim edge-to-rim edge should be somewhere around 11" (give/take depending on wheel rim edge size). Don't try to measure to where the bead sits, the rim is not that big of a deal and serves as the common measuring point inside and outside of the wheel

- Divide that measurement by two to find the center line of the wheel. Take that measurement and mark the wheel center line on the inside barrel with a thin sharpie or whatever.

- Next, take a steel ruler (or other thin piece of stiff flat rod material that you know to be true and does not flex - a 12" level works well) and lay it flush against the inside mounting face and so that the end rests on the inside barrel along the same axis as the previously scribed center line mark. Make a mark on the side of the ruler/level facing the outer edge of the wheel.

- Measure the distance between the two lines. Voila.... offset. It's not precision but it gives you an idea of what you're dealing with within a mm or two. (If you're measuring for brake clearance or something of that nature, you'll definitely need to be precise but this works for general wheel fitment.)

Mic

szymonf

Has someone given you some kind of plaque or award for being awesome! That helped a lot my wheels are definitely not +40 right now lol.