JABCAT

Had an unfortunate situation with the tires on my Callaway far from home yesterday and the only tires available were the Super Sports. On the car I had Continental Extreme Contact Sports, which I really loved.

700 miles on the Michelins ( 285/30/19 & 335/25/30) my initial observations are;

These tires are very noticeably louder than the Continentals that had 4K mi on them.

The car was a lot more "twitchy". Seemed like every groove, every bump, etc. the car was jumping all over the place.

Above 70 mph steering wheel was vibrating & above 80 it was really bad. Will have to get them checked out before my 800 mi trip back home.

Prices have really shot up in the 3 years since I bought the Continentals. Out the door (with replacement certificates) almost $2,800!

I know everyone loves Michelins, are my observations normal?

drewz06

ahh louder, not sure... i just started running conti's but i can't tell the difference really...

i ran a few sets of mpss and then the ps4s, and the ps4s was noticeably better compound wise...

i think if they have your toe "in" then you're gonna feel more confident in a straight line... if you lowered this will cause your toe to push out, the car will want to steer left/right more readily which may be contributing to the twitchy feeling...

also, if you are lowered, then you're changing the angle of your tire as well, lowering it will add negative camber... (why they sell drop spindles, keeps geometry consistent)

you may not want to do the full -.8 to -1 camber, i'd recommend a -.5 or so (in the fronts), being lowered that should help your tires wear more evenly...

just some of my idiot wisdom ive gathered, may or may not be correct

Higgs Boson

super sports came out in 2011,12 years ago and they have all the hallmarks of a tire from that generation. unfortunately the sizing for the C6 aligns with this tire in the lookup tools so one would have to think outside the box slightly for a more modern replacement.

I am running Cup2R's in the AMG GT Black Series sizing (1" taller front and rear vs stock) on my C6ZR1 and there is no rubbing on bumps or at full lock. I recommend deviating slightly from the auto lookup sizing and getting PS4s or some other modern tire. I've run Continentals with good experience on some other cars as well.

Street alignment specs I run is Front/Rear -1.5 camber and .01 toe in front/rear with max front caster.

JABCAT

I need to get the alignment done, hopefully before I start my 800 mi drive home Sunday. There were literally no other tires available within 400 mi & I was stuck 150 miles from home & needed to be in Bowling Green by this morning, so the super sports it's was. Even then, my wife had to pick them up from a store near my home & drive them 150 to where I was.

That said, nothing else has changed on my car between removing the Continentals and installing the Michelins, so the comparison is pretty straight forward.

As far as loudness, I downloaded a decibel app & on the Continentals the avg reading was ~ 76. After installing the Michelins it was 85.

_Rod_

Alignment... My tires got noticeably louder and wore the inside edges after my alignment shifted do to the following:

1. Front pucks flattened out resulting in lower car = higher neg camber and a lot of toe-in
2. Upper a-arms were walking out of the bushings due to track driving, also moving the alignment

Your new tires have sharp edges... My guess is those are scraping along the road causing the noise... Get the alignment done for sure. At the very least, if you can't get an alignment before you drive home, you can check your toe with a couple of straight boards and two tape measures. Set it as close to 0 as you can (maybe a bit in). And get an alignment as soon as you get home, or you will be replacing those fronts soon!

AzDave47

Road surface has a lot to do with the sound level, 76 to 85 is huge as every 3dB is a doubling of the sound. As stated above the PSS is a 12 year old design and things have changed a lot in that time, noting you had no choice so that is what you have. Toyo R888Rs are far noisier than the PSS or newer PS4S. Contis are generally known for good ride and quiet, good tread ware, but lose out to Bib on the handling and grip area. It's all in the priorities, both the company and the buyers.

Some think the Invo is a great performance tire. I would recommend them only for touring or looks.

JABCAT

Our "delivery" rep at the Corvette Museum called around and is getting me in for an alignment this afternoon.

jbs02somws6

I bought a set back in 2012 for my 09z they were a huge improvement over the factory Goodyears of course. After about two years and with about 60 percent of tread left I started to experience that same steering wheel vibration at about 70 up. Continued to run these a few more years and the vibration got really bad at 130+ by then. Like the car was gonna break apart bad. I ended up switching to r888 toyos and had zero issues with them in three years. Now I run r888r’s in factory sizes, they’re even better.

gsflyer2011

New tires are always slippery, they need about 2 k to settle in and get rid of all that fresh rubber oil.

KennyPowers

https://tflcar.com/2020/09/michelin-...-sport-review/

GET the 4S
I cant believe they still make the SS.. had them on a TT 911 back in 2005, they were the BEST then, 20 yrs ago..

(ps i dont have good things to say about the R888Rs as a street/track tire, they heat cycle out crazy fast, not to offend)

DaveInColumbus

The MPS4S is a superb tire. I just had four of them installed on my 2006 Z06 on the OEM wheels. $2078 out the door.

I've worn through my second set of MPS4S's on my 2015 Focus ST. It'll get a third set soon.

JABCAT

Interesting the replies to get new tires when I stated in my OP I got new tires. The Super Sports are on the car where they're staying until they wear out

Z.06

My experience in my C6Z06 is that the MPS4s is a great all-around tire but the MPSS is a better track tire. That being said, do not rule out the Goodyear Supercar 3 which is great in dry conditions. The MPS4s is still better in the wet.

MswmSwmsW

The super sport in these specific sizes are different from all of the other ones. They were developed specifically for the c7 z06, and are much better than the other sizes.

MswmSwmsW

Just keep in mind that the mpss zp in these specific sizes are different than the other ones. They were developed specifically for the c7 z06. They are much better than the regular version.

JABCAT

Seems like my original questions were answered.

"car seemed more twitchy"- brand new tires.
"are the Michelins louder than the Continentals" - could've been the road conditions and/or new tires.

"Car vibration over 70 mph", found out yesterday 3 of my wheels are bent - thank you Arkansas and Tennessee interstate. Let's see if I can make it home without making them worse.

Spaceme1117

The Super Sports are loud and they may get louder as they wear. Had MPSS’s put on my 2011 GS in 2018 right after I purchased the car. Huge upgrade over the Goodyears that were on there. Road noise was louder. Got louder after about 5000 miles.

Just put on MPS4S’s. Quieter and not as twitchy.

A great all season tire that is very quiet yet still is excellent is the Pilot Port All-season 4’s.

Nosferatu333

Not to mention the toyos look and sound like sh it. I drove them for 50 miles and took them right off.

passagemaker43

Realize you are looking to keep your Michelin's so take my info for whatever it is worth. Once horsepower gets to about 600 rwp I have found the only streetable non drag radial that will hook up in 2nd gear are the Toyo R888R's or a very close version of them. None of my Michelin's (excluding the Cup 2's when they are really hot) can handle that much power in 2nd or sometimes even 3rd. I run the 345/30-19's with great success but once again they aren't made in that width on a 20 inch rim. Have found they handle rain well but avoid standing water like the plague. Noise varies with road surface but I find acceptable. Handling is outstanding and ride when mounted on lighter (24 lb rear wheels vs 29 to 30 stock ones) aftermarket wheels is superior to stock. I drive the cars hard so performance is definitely my overriding concern. Will be at the half mile Indy Airstrip attack mid August on the Toyo's. Hoping to break 170 MPH in the N/A class.

Again don't know how helpful this info is for you but thought I would pass it along anyways. Still running Michelins on my Callaway because that is more a street car to me and rwp is still well below 600 which seems to be the trouble spot for the Michelins.
Keith

JABCAT

Appreciate the feedback. Considering the Michelins we're just installed Thursday & we're $2800 all in, they're not going anywhere.

My Callaway has 595 whp, and the Continentals had no issue hooking in 1st or 2nd, so hopefully the Super Sports are similar. Not that I go around dumping the clutch everywhere anyway

Am ticked I didn't think to grab the rear Continentals and throw them in my wife's Grand Cherokee when she delivered the new tires. They still had plenty of tread.