I know I could have used the search button, but there are too many posts to read through.

I current have 19 x 8.5 F and 19 x 9.5 R. Are there any advantages or disadvantages in running (245/35 and 275/35) opposed to (245/40 and 275/35).

Thanks in advance.

 

You want to stay as close as possible to OEM diameter(s) as possible.
The VDC uses these sizes in the algorithm that detects slip.

That said you can vary slightly w/o compromising the system.
I always play with the size calculators to get the optimum size.
Calculator

 

Here's another good one http://www.canadiandriver.com/tools/...c/tirecalc.htm

 

The only disadvantage in that setup, aside from the slightly smaller front diameter, is looks. Generally the rears are one profile size lower than the fronts.

 

So 245/35 and 275/35 should be ok? The reason I am asking is when I called my tire shop they suggested going 245/40 and 275/35.

Thanks

 

Ya, it will be ok. Most guys just go with one profile size higher in the front. Like for example my car is 225/40 and 255/35.

 

245/40/19 in front would be an incorrect size to run with the 275/35/19 on the rear. The 245/40 would be the same height as the 275/35 tire in the back. Your tire shop recommended this because they do not understand the stagger designed into the "G" or "Z" and many other sports cars. Stay with the 245/35/19 and 275/35/19 combo with your 8.5 and 9.5" wheels. It's Correct.

Oh Oh. Do you have a Coupe? I just realized you MAY have a Sedan. If that's the case, forget everything everything I just said.

Lou

 

alphabit = coupe