Good morning everyone. I have axis hiro rims with 19 X 8.5 and 19 X 9.5 and just purchased Kuhmo Esta SPT for the front. I was wondering if I could run 285-35-19 in the back with out having problems with the traction control. I thought about doing 285-30-19 but that would make the back tires slightly smaller than the front and I know that will cause problems.
Also what are your opinions on the Kuhmos...I've read the reviews on tirerack.com but differences in tire sizes and vehicles tend to have varying opinions. Any help will be greatly appreciated.

I run 245/35/19 and 285/35/19 without any issues, but I would consider 255/35/19 for the front instead. I'll be switching to that size up front once I need to purchase new tires

Why is this "Myth" still around about traction control? Like Redlude proved, you'll be fine and yeah...........255's.

Thank you for the comments!!! The "Myth" does have some truth to it. I switched my rear tire on my oem 18's to 245 40 18 since they were much cheaper and I had problems with the vdc kicking in when cornering. I had stock tires on the front. It makes sense that if the cpu senses differences in wheel speed, it will intervene to correct the issue so changing sizes can really affect how often the vdc acts.

were the front and rear the same tire brands/models and tread design.. that could be the main issue with the VDC when gripping characteristics of tires are not the same

Kumho makes some nice race rubber, but I'm not a fan of their street tires at all, except the MX.

I have been running 255/285/35x19's for the past 11,xxx without any issues.

I am running 255/45 r18 in the rear and 225/45 r 18 i the front and am having a lot of problems with the VDC kicking in and trying to control the car with cornering. The rear tires have a different thread pattern then the front and are a sport tires while the fronts are a touring tire. Do i need to buy the same tire for the front?

I'm currently running 245/35/19 and 285/35/19. No issues here. No one should have any issues with this setup. However, if I could I would go with 255/35 up front again.

Yes, this is not about diameter, but about grip level

yes

I just put on my 20x9.5 w/245/35s, and my 20x11 w275/35s, the slip light comes up on the dash and cuts power to the wheels, ive been just turnin the trac-control off when i start it up, but I was wondering if it is the wheels or not, and if theres any tricks to cure it without switchin my wheel tire combo.

both your front and rear tires are way too tall which is probably the problem. You should be running 245/30/20 and 275/30/20.

You can also run 245/35/20 up front and 275/30/20 without a problem. Although 245/30/20 up front will be closer in spec.

this is always a bad idea IMO, it shifts the weight balance of the car around and actually makes the front tire a hair taller than the rear. In terms of handling balance this can have negative effects. I still never understand anyone's justification for this, when no one ever recommends running 245/40/19 in the front of a coupe.