235/40/18 Front 255/40/18 Rear

anyone using this setup??
anyone having problems with VDC or anything particular?
Thanks in advance!

 

It's not one of the common setups but you shouldn't have any problems with VDC/TCS. The F/R diam diff is 0.6" which should be perfect. The OD is a little smaller than OEM so it will throw off the speedometer/odometer only slightly.

 

The number of potential tire combinations is endless. Why would the NOT work?

 

That should work. Its not common like they said but it would be fine.

 

would there be a problem doing a 225/45/17 and 245/45/17 setup? on the stock 17in rim.
or would it be better if i did 225/45/17 and 235/45/17?

 

Neither combination is optimal but I would go with the 225/245.

The stock tire sizes and Outside Diameters are:
225/50/17 25.9"
235/50/17 26.3" (0.4" stagger)

Your choices:
225/45 25"
245/45 25.7"

225/45 25"
235/45 25.3"

Because the 45 profile is shorter than the OEM 50 profile, all combinations are shorter than the OEM setup. That throws your speedo/odometer off a bit. I'm guessing you don't have TCS or VDC but if you did, the stagger is still there and within tolerance so you wouldn't have a problem there.

 

wow, thanks for your help, what is the "common" setup??

 

The normal/common setup would be 225/245 to match OEM size, the plus-size would be 235/275 on wider wheels. Your 235/255 is like a half-step up, giving you slightly wider tires.

 

would it be better do do the 235/45 or 245/45 setup in the back which one would be better?

 

or should i stay stock. the reason i want to do the 45 profile is bc i want to get the eagle f1 asymetrics.

 

245 would be "better" in the sense that it would be a slightly wider tire giving you slightly more traction.

There's no overriding reason to stick with the 50 profile tire other than the speedo/odometer accuracy. You won't be off by much though so I wouldn't sweat it.

 

is the speedometer on the wheel on the front wheel or the back wheel?

 

Drop the clutch from a stop and watch the speedo and the scenery - report back.

 

my friend is running that setup on his Z w/o any problems... but it has a 0.5" lower sidewall than stock setup, which means more wheel gap...