That helps a lot. I was worried that the 255 would be cutting it close to rubbing. Looks like that's the way to go on the 9.5.

If I went 8.5 & 245 what offset should it be to match the 9.5 + 20 on the rear. From my calcs it looks like it should be a +12 but that can't be right because nobody makes that. They are all +25-40 in the 8.5 width.

 

From the PMs I have been getting, some members aren't familiar with the "aspect ratio" of the sidewall. Please be aware that the middle number of the tire size is a percentage; not an exact measurement, per se.

 

I’m surprised that we do not have a Sticky discussing tire sizing. For example:

The metric tire sizing system represents a tire size as:
[section width (mm)] / [aspect ratio] - [rim diameter (inches)]

For example: a tire size 225/45-18 is 225mm wide, has an aspect ratio of 45 and fits an 18" rim (wheel).

The aspect ratio (the second number) is not a measurement. The aspect ratio represents the tire's sidewall height as a percentage of the tires width (section height divided by section width). In the example above, the sidewall height is 101mm (101/225=45).

The aspect ratio is important since that (along with the wheel size) determines the overall diameter of the tire allowing you to match your stock overall tire height (diameter). For example, a 225/45-18 tire's sidewall height is 101mm, and a 245/40-18 tire's sidewall height is 98mm.

So, both tires have nearly the same overall diameter.

 

255/40-18 is even better, sidewall height of 102mm.

 

All I have seen is +25 for the 8.5 wheel. I'll need to add spacer if you want the wheel and tire more flush with the fender. I'm not sure what size though, maybe someone else can comment here.

 

Thanks for the help guys! Got my Battles mounted. 18s 9.5 all around 15 offset 255/40f 275/40r... what you guys think?

 

First post here, Thanks in advance for any help.
New setup will be as follows:
Enkei NT03 18x9.5 +27 on 245/40/18 all around. Would like to install Tanabe nf210 springs and 10mm spacer in front, 25mm spacer in back. Does any one see any issues I may have? Would I also need Rear camber arm & rear toe bolt to get back into spec align?
Thanks again .

 

Yes, you're running a 245 on a 9.5" rim

 

Would you mind elaborating, Yes to which set of issues?
Thanks

 

It's a bit of a stretch. Is this just for looks?

 

It is strictly a street setup. Wouldn't mind keeping at least stock performance standards however. Would I be taking a step back in performance?

 

A popular performance street setup is 255/40, 275/40. If you never plan on going wider than 245, just stick to 8.5" wheels.

 

I agree, with 245's with 8.5 wheels. The 255 in the front and 275 in the rear on 9.5 wheels work well. The 255 front will provide somehwhat less understeer. But I feel the 245 in the front on 8.5 width wheels provides a quicker steering response. and I lik ethe 275s in the rear on 9.5 inch width wheels. Just my experience and preference.

 

Checked this site and here's what it said: "The domain name JGTC.COM is for sale Price US$9750"

 

I was going to get 9.5s +20 all around and was confident in that fitment, but I can't get the wheels I wanted in silver. So.....

I found a new konig wheel that I like that comes in this fitment.
8.5 f / 9.5 r + 15 all around.

From what I've read on this forum it seems that +15 shouldn't rub in the front or the rear at those widths with a 255/40 and 275/40, but my gut is telling me it's cutting it close.

Can somebody confirm this for me?

I'm not dropped. I don't plan to for a while. But what if I do drop at those offsets and widths? I don't want to do any fender work or have any issues with my driving. Am I making a mistake or am I all good?

 

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

Post #11.

 

What was confusing is that Wheeldude told me an 11" + 20 would not rub and that's a full 19mm more extended than a 9.5 +20. Since a 9.5 + 15 is only 5mm more extended I thought I might be safe. Oh well. I'll keep scouring the interwebs to find a set of wheels that will fit.

 

Sorry if this was already asked...I figured it would be, but didn't find anything in the search.

Anyways, trying to figure out what size tires to put on my stock anniversary wheels. Prefer wide-ish in the rear. My cars lowered, and I have 25mm spacers for the rear if needed.

The fenders aren't rolled, but can be. Trying to get as close to "flush" as possible.

Was told 265 or 275/35/18, but I can't find pictures.

Thx in advance

 

Easiest way is to bring your rims to tire discounters or tire kingdom and have them size them for you.

 

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