Hutch66

Hello, guys. I'm sure question been asked but,
Stock sizes.
Front: 285/30/19
Rear: 335/25/20

1st. thing is I want to get rid of these run flats. Ride suck with these tires. Car only has 1300 miles but thought by now it would be a little more compliant.

I know it's a good track car but 80% of the time it's on public roads.

Also, was thinking of doing 285/35 and 335/30. Has anyone gone this route? Any issues?

Thanks, guys.

bjones7131

I don't think anyone other than Michelin makes a tire this size and no NON RFlats and summer only tires. I think there are some other brands for the front but not rear. Could be wrong but I haven't heard of any. Maybe someone else will chime in with more info. I too would like to replace my RF on my 17 GS.

Cliff8928

Continental makes a set in the OEM sizes which are not run flat.

JoesC5

I believe that you at going to be disappointed if you think that changing from run flats to non runs is going to improve the ride.

Eff A Ford

Have you tried lowering the tire pressure?

bjones7131

My experience and from what i have read tells me there is a much softer and quieter ride with non RFLATS.

Foosh

I think your experience is dated. I run 6 months on OEM M-PSS ZPs, and 6 months on M-AS3+ non-ZPs, and there is very little difference in either softness or quietness of the ride. Runflats have come a long way in a decade.

Glennm27

Continental Extreme Contact Sport (non run flats)
Continental has plans to make tires in Z06 sizes. They do currently make the fronts but have yet to produce the rears. Coming Soon is all I've heard.

Bill Dearborn

There are differences in the way Run Flats for the Corvette were designed and built due to GM Specs changing. The Michelin Run Flats used on the Corvette are no where near as stiff as the older Goodyear Run Flats used on the C5. Those EMTs were specified by GM and designed by Goodyear to be run 250 miles at zero air pressure.

Since then GM has reduced the required zero pressure operation to 50 miles so the tires don't have to be as stiff. The Michelins only have one reinforced sidewall which is on the inside. The outside sidewall is the same as any non run flat tire. Spring Mountain has cut aways of the tires so you can feel the difference by squeezing them with your hands. The outside sidewall collapses easily while the inside does not.

I doubt you will notice much difference in ride between MPSS tires and MPSS ZP tires other than the placebo affect. The MPSS ZP tires handle great and probably are equal to the MPSS from a handling standpoint. The only advantage to changing over to non run flats is cost.

Bill

bjones7131

Good info. R U saying the only diff. Is inside wall. I am no expert but i would think there are other differences that makes it a RF. Other than one inside sidewall. I believe the Non RF are quieter which is important to me. I don't track or do aggressive driving. Maybe i should buy a honda, no, lol. Thanks for your insight/info.
BJ

Foosh

I am in 100% agreement w/ Bill above. The non-ZP PSS is no quieter than the ZP version, and ride quality is very similar. Same tread pattern, same compound, same tire, except for the inner sidewall.

bjones7131

Don't want to be argumentative, last comment. So if the only difference is inside wall and price it would make sense to buy non run flats. I thought there would be something different with the compound to allow the RF to self heal and allow you to drive the 50 miles suggested in an earlier response. I agree the old GYear run flats were awful. Thanks for all the good info.

Foosh

No, ZP's don't "self heal." The reinforced sidewall simply keeps the tire from collapsing and ruining a wheel, allowing one to drive at least 50 miles. However, the tire is destroyed in the process.

jriley9922

I did the 285/35 and 335/30 route.
I wanted to use the car for a long road trip... And not burn out cup2's driving up and down the coast. Not to mention they are scary at highway speed in a downpour!
so.....

I used the oem Michelin rears from my first c7 on the front as they had like 60% tread and were just laying in my garage
​​​​(285 35 19)
and a federal tire 335 30 20 on the rear

I don't think federal makes these anymore.

But the point being... I went up a size front and rear and had no issues or rub.
Granted I was not driving aggressively or racing.