I just ordered 19 x 9/19 x 11 F14's for my '03 z06. I will be running 255/35 on the front(26" diameter) and 305/30's(26.3" diameter) on the rear. Will this combo cause any AH issues?

 

I believe you need a minimum of 1/2" difference in height.

 

The general consensus is that you should have no less than 1/2 inch and no more than 1 and 1/2 inch difference between front and rear overall diameter to avoid any traction control issues. However, there are some on the forum who are running the same size at all four corners without any apparent issues. Have not tried that myself so cannot verify that as correct. You may or maynot have an issue.

 

Thanks guys.

 

J ust ran my friends tires on a 650 mile trip including a 60 mile road run. the difference was .280" in diameter. I had no problems.

 

 

question is why would you? use 275 or at least 265 up front. if you run a 305 255 combo you'll have to raise the rear a bit to balance out the car and dial out the understeer you brought on by using such a split

 

Thanks for the info. Would a 265/35 create understeer?

 

Why not run 325-30-19's like I have on my 19x11's ???

They REALLY fill in the rear of the car.

 

Depends on the wheel/offset. I'm running 305-30-19's on CCW 505A's on the rear, and anything wider would stick out too much with that wheel. What wheel/offset are you running with a 325 width? Do they stick out?

OP, with a 255-35-19 in the front, you should probably run a 305-35-19 or at least a 295-35-19, in the rear. I'm running 275-30-19's (19x10 rim) in the front with no understeer issues with aggressive street driving. Will you be tracking your car?

 

I already have 305/30's. I do not ever track my car. I'm going for looks as far as tire size. I'd rather the sidewall not be taller than the rears, but not look like a rubberband either. I think 255/35 & 305/30 would give the best "look". Would the 255/35 present a dangerous amount on understeer or be hard on the car? If not and I can align the car properly, I'd like to go with this setup. Thoughts?

Thanks!

 

Offset is for C5 from OE Wheels. And NO they don't stick out.

 

Very interesting. I contacted Forgestar about getting wheels on my Coupe and they would not even consider a 19 on the front because they don't have the offset for our setup. Could you please provide the wheel specs as I really want 19's front and rear and their recommendation of 18's on the front is a deal breaker.

If this setup works for you I would be extremely interested in hearing how everything fits and turns out.

 

 

With respect, the question is not whether any proposed combo seems to work fine on the day, the week after, or even 6 months after we install it.

The question is whether it will work under a heavy load on a specific bumpy road with a three degree side slope and an OAT of 55 degrees with tires that are 50% worn, or any one of dozens of other unique scenarios on the one day where we need this system to work flawlessly.

If we stay within the design specs, it should function as advertised. When we depart those specs the best we can assume is that it probably will work just fine, but there is a chance it won't.

I'm not really talking about track use or autocross. I'm talking about that one day in the future when we come around a tight curve and find circumstances that were not remotely expected and we and the car suddenly have one chance to do everything right.

Since there are literally dozens of options that allow one to stay well within the specs, not sure why anyone should pick one that is on the margins or well outside the margins?

I chose the following setup because it meets all my needs and stays well within the specs. Might not really ever matter ... might someday matter a lot. Ans, again, there are so many spec compliant options available from both performance and cosmetic standpoints. Good luck.


Wheels – 18x9.5 & 19x11

Michelin Pilot Super Sport Tires – 275/35ZR18 & 305/30ZR19

 

19 x 9 +44

http://www.corvette-wheels.com/forge...gun-metal.html

I bought from Eric at Modbargains, but spoke to forgestar as well about the 19" fronts.

How long ago did you ask them?

 

The 255/35 would be just fine. The front/rear size difference is a bit close with the 305/30 rear, though. I personally would want more than 0.2", closer to 0.5", but it appears others have seen this work.

Interestingly, I think the sidewall is too small with my 305/30/19's & 275/30/19's, and want to go with 255/35/19 & 295/35/19 when my current Hankooks wear out.

 

do you have any pics would like to see them