I have done some searching and people run this setup but just want to check. I am buying some Federal 595 RS-R for my Z. I have read they run wide so I don't wanna go 245 front 265 rear, which was my original plan with Hankook's. My only option is a 235/40-18 front with a 255/35-18 rear. Lots of Z and G guys run this setup but my Dad read on a BMW forum for his M3 that it could cause problems with the ABS and he was concerned. We are both trying to get our cars ready for a track day together at Willow Springs. My car is a base model so I don't have VDC. Thank for any input.

 

Your front tires will be almost 5mm taller than your rears but since you don't have VDC, I guess it doesn't matter. It will look funny to have all that wheel gap in the rear, if that sort of thing concerns you.

 

Track day on federal tires?

Is that model a track tire?

 

It says they are. A guy in a Miata recommended them to me and he has been doing track days for years. His miata is not even street legal.

 

Link to the rears...

http://www.onlinetires.com/products/...g+90w+bsw.html

 

I was skeptical too. I have Hankook V12's now. Wanted the RS-3.....but for the price I will take a chance on these.

 

is it really 5mm? I thought it was a percentage of the height and width. I might just go with the wider 245/35-18 and 265/35-18 to keep the height the same. Just hope there not too wide for my stocks 07 rims.

 

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
235/40-18 3.7in 12.7in 25.4in 79.8in 794 0.0%
255/35-18 3.5in 12.5in 25.0in 78.6in 806 -1.5%

 

Stock 07 wheels I would run 245/40 front and 255/40 or 265/40 rear.

 

So .2 of and inch difference?

 

I want to but they dont have a 255/40.....only a 265/40 but I think it may be too wide because I have read the 595 RS-R tend to run wide.

 

Runs wide by 2 or 3mm , who freaking cares. It's not like your running 315's or 325's where you are very close to the limit.

 

sounds good thank you