does anyone ride on 40 profile sidewall on there stock 06+ 18" rims? I know the stock height is 45, but I was planning on installing the 40 but wanted to know if the fender gap was all that bad by going down to 40. reason being is that the 40's will track better. thanks.

 

What sizes? 225/40 and 245/40? If so, then you'll lose about 3 in. off the overall diameter, which makes your Z look like a SUV.

 

the overall diameter difference is 0.9 inches from 45 to 40....

 

Oops. Look at the wrong numbers. I was looking at the circumference, but typed overall diameter.

 

anywho... just lookin for some pics cause I know a lot of guys are running this setup.

 

Asking for a pictures of a 40 profile on 18” wheels if you want to see fitment and overall diameter makes no sense since the profile is related to the tire's width, and that measurement provides the overall diameter.

If you are looking for specific examples, you need to specify the tire width and the profile (and of course the wheel diameter which you do specify as 18").

Here is an explanation:
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.

--Spike

 

This is the best picture i have. In my opinion it is butt ugly. Its a 225/40

 

Thanks for the pic.

But let me get this straight:
the stock 225/45/18 front height is 26.0 inches
If i mounted a 245/40/18 tires the new height would be 25.7 inches (according to tire calculator)

So will this .3 inches even be noticeable, or will this just look like the rest of the 45 profile tires?

 

Ooppssss....I have 45s...sorry about that.

 

Nope, they are 225/45 and 245/45. Sorry

 

Here is another one. It looks really raked and alot more tire gap.


Fronts are 225/40 Rears 245/45.

 

Thanks for posting that pic it helps

But would mounting a 245/40/18 front and 255/40/18 rear be almost equivalent to mounting a 45 profile tire in looks since the sidewall is a "percentage" like spike said?

 

The rear is a little short, 265 or 275 is prefured for the rear but your wheels are not wide enought for them. You said for the track right, the setup you posted above will be a great choice.

 

i have front 235-40-18 and i just bought 255-40-18 on my rears (pics later) i love it and it def does not look like an suv. i have 1.2" drop and 20mm F and 25mm R spacers.

 

better pic with the 245 rears

 

^^thank you so much for the pics kno! looks great!

 

im also running 225-40-18 in the front and the stock 245-45-18 in the rears and i think it looks good, even tho im not lowered yet.
ill see if i can find a pic to post.

 

not the best pic but..