I need 4 new tires and I want to go with the F1's. What is the exact size I need to order for the front and rear?

 

To be more specific, what size do I need for the stock Z rims?

 

my stockers are 245/45 r18 in the rear and 225/45 r18 in the front

 

yeah, I know the stock size but the F1 GS-D3 doesn't come in those sizes. I am thinking 235/50 front and 245/50 rear. Would that work?

 

Perhaps try 245/40/18 f, 245/45 r. At least you get proper overall OD's front and rear, and you don't have any VDC issues.

Plus, the wider front width and stock rear width should reduce understeer IMO.

 

The reason I am having to replace my tires is that I spun out and ran over a sharp curbed median. With that in mind, I don't want to lower the ride height any which is why I was considering the 50's. It's less than 1/2" but it might have saved my mufflers and my y pipe in this accident. But on the bright side since I have to replace most of the exhaust, I am upgrading to the Nismo cat-back system.

 

According to my calculations, if I go with 235/50-18 in front and 245/50-18 in back then the back tires will be about 1/2" wider and 1/2" higher than the front tires. And overall ride height of the car will raise about .64" Does that make sense? I realize lower looks better but this is the 2nd curb I have tangled...

 

Click here for more than you ever wanted to know about wheels and tires for the 350Z
http://www.350zmotoring.com/modules....ex&name=Wheels

 

Here is also a very good tool for comparing tire sizes:

http://www.1010tires.com/TireSizeCalculator.asp

 

If you proceed with the Eagles let us know how it turns out. I wanted Eagles but, since they did not come in stock sizes, I ended up with Toyo T1 Rs. I'm happy with the T1 Rs but there is no doubt the Eagles are the best thing flying (or best thing sticking in this case...lol!).

 

I don't know if 1/2 inch of more clearance would have saved your exhaust system. The exhaust is hanging on by rubber stuff and when pushed up they will move up a short distance. IMO, if the ground clearance is going to make a difference in such accident , it needs to be at least a full inch higher.

BTW, I have F1's on my 325i and they are awesome.

 

go with 245/40 front and 245/45 rear. This combo will be more balanced than the 225/45 245/45 sizes (more balanced = less under steer). I mean this with respect - don't expect a tire to mitigate damage from spinning and driving over curbs. Buy the tires that match your stock height and stagger and the correct width for your wheels.

 

I went ahead and ordered the 235/50 fronts and 245/50 rears. We'll see how it goes...