this ^^^ whining Devil is on it, and Mavens postis correct.
I run 245's on 9.5 wide wheels and its a lot of tire if you dont track your car. and much more expensive compared to 235

 

Maven and John in the same thread on CSS wow!

But Id listen to both of these guys!


Ive ran 235s on my SS/tc and liked them a lot. I am dropping down to 225's on the tc's due to availability. But like I said I ran 255's (9 inch wide wheels) on my cobalt and while it honestly felt great at highway speeds, I agree with maven its a bit much for a street driven cobalt. Not to mention I noticed a loss of gas mileage (another reason im going back to my ss/tcs with 225's).

Wider isnt always better.

 

well they were hankook ventura vr something lol but they are pritty much new and for 2 of them he wanted 100 so i couldnt pass it up. but im gonna be at the track alot this year or at least i hope to and the 1.4mile that is. well im gonna toss them up front and see how that goes. thanks for all your help everyone

 

Those 245/40s DESTROYED my gas mileage compared to my 215/45s Like 4-6mpg worse!

 

The 255's on the 9" wide rim did the same to me. im back on 225/40/18 on the stock ss/tc wheels now. So much better. The car isnt as settled on the highway but gas mileage is back!

 

I'm running a 235/40-18 on an 18 x 8 wheel, dropped eibach/koni combo and I love it... 245's would actually hurt you...

 

They fit. I have Invo's on mine.

 

well they are going on at 5pm at my buddies gm stealership for $20 lol good to have friends lol also i have to get inspected soooooo well see how that goes, thats theh main reason for the tires the ones one their wont pass inspection

 

ok they went on and installed and the old tires gone all for $25LOL love friends. and ill snap a pic in the am

 

a 255/35 is the exact ratio of stock 225/40, so a 245/40 is much taller and wider, which will throw off the speedo and acceleration...i wanna run a 245/35, but the overall ratio is slightly smaller, which will change the gearing...

 

So, let's just say for hooking up a launch would 255/35 be better than 245/40? But more pricey? Sorry if it's a newb question I am not really well versed on tire specs.

 

Or would the 225/40 stock size work fine with the right tires? Or even 235/40? Like Say dunlop Z1's for instance.