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1st sports car application of Michelin’s all-season high performance tire that can corner at nearly 1G Tires: 245/35ZR19 305/30ZR20 Wheels: 5x120mm pcd
19x8.5"
20x11" Rotors: 12.6x1.18" 13.6x1.02"
I'm guessing this new AS tire is a slight evolution of the Michelin AS3+, which many of us have been running on C7s for several years now. I have two dedicated sets, the OEM PSS, and the AS3+, which I've been swapping back and forth, winter and summer, for 3 years now.
The performance difference in reasonably sane street use is almost undetectable, except that the AS3+ is vastly superior at any temp below 50ºF. Below freezing, and it's no contest as the PSS is horrible, while the AS3+ is great even down to single digits. Even when warm or hot, the AS3+ retains more than ample grip. My conclusion is that the only time the PSS is superior is for track use, when pushing hard and when the tires have a lot of heat in them. I know the AS3+ has been tested at Spring Mt., and the pros there confirmed that the AS3+ is pretty close for the first few laps, and PSS only gets noticeably better when the tires get really hot.
I suspect the same will apply to the PS4 vs AS choice. Quite frankly, for an all street-use car, you'll be far better off choosing the AS because of it's superiority in even moderate temps (40-60ºF).
Such a smart move for GM to do this! I have always thought they should have offered an all season tire, at least as an option for some people. If I could have chosen an all season tire for mine from the factory I would have done it since there is a good portion of the year where I'm driving in sub 50 degree temps here. The plan has always been for me to go to all seasons when the OEMs wear out.
Yes, it's very smart. When the AS3+ debuted, multiple reviewers commented that the performance difference between UHP all season tires and summer max performance tires is getting very small, and the advantage in cooler temps is obvious.
It's a great choice. I swapped out my oem Pirelli run flats with these as soon as I bought my Mercedes. Great all season performance, and they have worn extremely well.
I don't know if it is a Tire Rack specific deal, but I am covered for road hazards (a.k.a. NYC streets) damaging the tires. They sent me a next day replacement for any damaged or bubbled sidewalls.
Yes, it's very smart. When the AS3+ debuted, multiple reviewers commented that the performance difference between UHP all season tires and summer max performance tires is getting very small, and the advantages in cooler temps is obvious.
Where I live (and most of the northern US for that matter) there is a good 7-8 months straight where I might see sub 50F temps for at least a portion of the day, so having that bigger safety margin is definitely a good thing!
19 and 20 inch wheels? Is sanity returning to the selection of wheel sizes? Does anybody know if the Z51 has different wheel and tire sizes from the base car?
dry-sump is standard for all cars. I guess that means we will have a 500 mile break in?
Not necessarily. It was only implemented because of a late discovery after the first cars were delivered that the design of venting system was such that foaming oil caused by the silicon seals curing in new engines burped through the vent tubes in such a way that it could contaminate the intake. More specifically, the new silicon seals in contact with oil depleted the anti-foaming additives in the oil. After 500 miles of curing, that no longer happens, hence the 500 mi oil change.
The C8 design may not have that issue if oil foam can't vent into the intake.
Not necessarily. It was only implemented because of a late discovery after the first cars were delivered that the design of venting system was such that foaming oil caused by the silicon seals curing in new engines burped through the vent tubes in such a way that it could contaminate the intake. More specifically, the new silicon depleted the anti-foaming additives in the oil. After 500 miles of curing, that no longer happens, hence the 500 mi oil change.
The C8 design may not have that issue.
We're sort of crossing wires here. The 500 mile oil change is mandatory on the C7s because of the reason you listed. That's not the same as the required 500 mile break in. The latter is for the drive train components other than the engine. Think: differential. Good bet that will still be required.
We're sort of crossing wires here. The 500 mile oil change is mandatory on the C7s because of the reason you listed. That's not the same as the required 500 mile break in. The latter is for the drive train components other than the engine. Think: differential. Good bet that will still be required.
I know, I was interpreting what he almost certainly meant. He just left "oil change" out of the 500 mile part.
It does, but Tirerack is only listing, so far, the 2020 in Z51 trim, and, its showing summer tires only as we would expect, but its also showing NON Runflats. THey havent listed the standard Stingray yet nor the new Michelin Pilot All Season Sport tires which will be runflats.
07-24-2019, 08:06 AM
BASE C8 Michelin Pilot Sport ALS
