TorchRedRocket

Would this be stupid? I was thinking of running a 265/35/18F and 275/40/18R. And then I got to thinking, why not run a 275/35/18 up front? Would there be any adverse affects to this, handling-wise, running the same widths at all 4 corners? Has anybody done this?

renegad44

I don't see any reason why you couldn't run 275's front and rear, but I would do 35's. I'm running 18x10's front/rear, 275/35 front, 295/35 rear. Mine is lowered on stock bolts and I have no problems with 275's up front.

mikes1hog

No problems with the electronics? No warning signals on the dash? I thought that you needed to maintain the stagger between front and rear to keep those electronic gizmos quiet. It would seem that with the same size tires and wheels that the stagger would be lost. If all is OK, could you explain how that is ? Thanks.

TorchRedRocket

275/40/18's are 1" taller than 275/35/18's. Thus, maintaining the front/rear stagger...

mikes1hog

I agree with your setup. Renegad44 suggested 35's front and rear.

renegad44

I don't know, I guess my reasoning is if you have same size wheels, and same tire height, it shouldn't activate ACH. Follow the link below, Toque is pretty damn good with wheel and tire sizing, if you notice, he's running 30/19's front and rear, same as me, except mine are 35/18's front rear. There are other guys running wheels/tire height the same.

As far as computer problems, not a one.

http://forums.corvetteforum.com/c5-g...5-30-19-a.html

roscoe118

Toque may be running 30/19 front and rear (I do as well), but I gaurantee that they are not the same widths! I'm running 275 front, and 305 rear, widths and I'm sure he's doing at least the same (maybe 315 rear).

You can not run the same height tire on the front and rear without the AH complaining...

renegad44

Excatly, just as mine are 275/35/18-F, and 295/35/18-R, with no problems at all....

The OP want's to run 275's front and rear on 18's with staggered heights.

roscoe118

OK I guess this statement confused me...

Humy

My WS6 T/A had 275 on all fours and I hated it, uneven road would pull me all over over the place, I like 245s in front

STALION

Rule of thumb I believe is 1/2 and more height difference between front and back if I'm not mistaken. As for running 275 width up front is not an issue what so ever.

photonhunter

I've been running 275/35Z R18 on all four Z06 style wheels for most of my FRC's life.
I know what 'the rule' is, but it hasn't messed up my handling.
I don't know why I haven't suffered the consequences, I'm just putting forth a data point.

dan k.

TorchRedRocket

Gotcha.

Hmmm I wonder if the wider fronts are more prone to this? My stock sized goodyear runflats were HORRIBLE when it came to darting and following road grooves on the highway.

Do you not have active handling? I'm wondering if that's why you haven't had issues?

I know the tire sizes (overall diameter) in question will work together. Basically what I am asking is if I will have any adverse handling side-effects from running a wider tire on the front that's as wide as the real, as opposed to the OEM sizes of 30mm narrower up front.

_zebra

275/35-18 is the same overall height as a 245/45-17, so you're good

nj02vette

Wider tires up front will definately make you pull more. I've heard that wider tires on the rear mitagate that, but don't have any experience. Overall, I think you'll be fine but be prepared to find every grove in the road.

I'm running 275/35/18 on the front.

Changing tire diameter has an affect on the spedometer and AH measurements. One of the things the computer does is it looks at the difference between front and rear tire revolutions and if it determines that one is spinning faster than it's supposed to relative to the others, it then activates traction control.

However........if the correct sized tires have been programmed into the computer, then I believe all is OK.

roscoe118

I was thinking the same thing. Perhaps and older ('99?) FRC that does not have AH...


I think nj02vette summed it up pretty well. You can expect to feel more groves in the road. I clearly noticed this when I went from the stock 245s, to the 275s, up front. No big deal though. You'll get used to it quickly!

FormerlyFiero

Generally speaking, most 50-50 balanced cars have narrower tires in the front to lessen the chances of oversteer, even without factoring in active handling. They were purposely engineered for the "average" driver so as not to let them get into trouble (plow off some speed). Tighten up a Fiero too much and it will spin like a top about it's axis. (before the days of electronics). I'm thinking that tire diameter is possible for the computer to calculate, using the ABS sensors, the width isn't.

photonhunter

No, the FRCs did not have AH, just TC.
I've heard that TC doesn't take the front-to-back tire sizing into consideration. Don't quote me on this, it's just hearsay evidence. <g>

dan k.

mikes1hog

Now I am confused. Why would you want to get used to feeling the grooves in the road? Quick or not? I was ready to do 18's all around with the wider tires, but I'm not so sure now. At my age, there plenty of shxt to get used to; I found the right tires on my Harley to avoid feeling the grooves in the road (I refused to "get used to it")-why would I want to feel the grooves in my Vette?

Mr.Bill