Hello all,

I wanted to ask for some suggestions on what tire size will suit my current 09 g37 coupe X. I have recently purchased a set of stance directionals 19x8.5. I am currently in the process of purchasing tires. Here's where I need some guidance I am torn between 245/40/19 square setup or 255/40/19 square. I like the smaller fender gap with the 255 but I heard 245 fit better and 255 won't go on an 8.5" rim well.

I also like to note this is my daily driver and I won't be lowering the car cause of East coast weather/road conditions.

Please let me know what you guys think! I have the set of rims sitting at home patiently waiting to be placed on. Thanks everyone!

 

Stick with 245 until you get a wider wheel

 

In terms wider wheels, how much wider can a coupe X go till modifications to make a certain size fit?

 

There's some variables, especially on AWD.
If you want to keep your 8.5s in front and get the same wheel in back but wider, you could run a 10 to 10.5" and run a 285/35/19, this will closely match your 245/40 diameter so it will work w/ your AWD, but you need to get the correct offset. Also, if you're not lowered that would need to be considered as well. Otherwise a whole new aggressive square setup could be something like a 9.5 +25 on 265s for example.

 

Run 245/40/19 squared or 245/45/19 so it doesnt affect awd.

 

245/40/19 squared is perfect.

 

Not to hijack the thread or anything, but what does offset mean? What exactly is done in an offset?

 

Offset is how far from the center line the actual wheel mount is. The further positive the offset is the further out from center, the less positive the further in from center. So a +45 wheel will have the mount 45mm further out from center, this will being the wheel further in from the fender.

Wheels with more positive offset are more conservative, less positive is more aggressive.

 

Wait, I am a bit confused. If a more positive offset is farther from the midline, how would that bring the wheel further in from the fender? Shouldnt it bring the wheel further out (as in a wider stance)?

 

The lower the offset the more it will poke out.


so a +45 will be more sunk into the wheel well then a -5. I know its a bit confusing at first.


Also if you use spacers for example a wheel has a +45 offset and you use a 20mm spacer this will effectively give you a +25 offset.


To answer your question I would run a 245/40 tire I had a 19x8.5 square set up but on a sedan and ran that size tire with no problems

 

This is about as straight forward as it gets, very informative.
What is a wheel offset explained

 

Oh, I get it!

Thank you all!

 

Thanks all I went with the 245!! Looks great too!

 

What size wheels though?