Originally Posted by madrob2020 (Post 1597610381)

s but all PSS/Cups are same.

Originally Posted by dfettero (Post 1597606265)

Are the OEM Michelin PSS that you can buy at the dealer the same as ones can buy from Tire Rack or other major distributors?

Originally Posted by Luke@tirerack (Post 1597612063)

yes ... exactly the same

many dealers purchase them from us

Originally Posted by Luke@tirerack (Post 1597612063)

yes ... exactly the same

many dealers purchase them from us

Originally Posted by Bill Dearborn (Post 1597610419)

Well not exactly. The PSS ZP and Cup2 ZP have specific Corvette only rubber compounds. That is why it is a little more difficult to just swap tires to non run flats because things besides the sidewalls are different. You can't compare the MPS4 tire to a PSS tire and assume the comparison is the same for the PSS ZP.

Bill

Originally Posted by rrsperry (Post 1597619134)

Ok, I'm not quite believing that. Are you saying that if you buy a PSS, or CUP tire from the dealer and Tire Rack, (same model, ZP, and size) there is a difference in compound? I mean, yes, PSS4 are differnet than PSS, but if you order the same tire, it's the same tire...

Originally Posted by rrsperry (Post 1597619134)

Ok, I'm not quite believing that. Are you saying that if you buy a PSS, or CUP tire from the dealer and Tire Rack, (same model, ZP, and size) there is a difference in compound? I mean, yes, PSS4 are differnet than PSS, but if you order the same tire, it's the same tire...

Originally Posted by Dcasole (Post 1597619309)

Right , I agree , unless its otherwise noted , my AMG does list MB specific tires , not sure what the difference is , I am think it's the MB extended mobility which is a fact name for runflats ...lol
Dave

Originally Posted by madrob2020 (Post 1597620349)

Guys (hope I'm correct), I believe he's saying that the ZP (runflats) are what was specified by GM especially for the C7, for sure the GS/Z06/7. If you go to a non runflat in same tire, MPSS, the compound will be different & will not handle as well due to rubber compound & the sidewall. I think I read were the inner or outer sidewall is made even stiffer (different) from the other sidewall for better handling. It's the ZP versus non-runflats that are different compound. I'm sure Bill will be back to tell me/us the truth, the man is beyond just knowledgeable.

Originally Posted by Dcasole (Post 1597620807)

I agree with you on Bill's knowledge!!!

Originally Posted by atljar (Post 1597634733)

There is such a thing as a tire made specifically for a car manufacture, and they are "different". This is even beyond runflat vs non runflat.

ie... you could have a 295/30/18 Mich PSS Non runflat and a manufacture specific 295/30/18 Mich PSS non runflat that are different compounds, sidewalls, and even width (seriously).

Here is the kicker, these manufacture specific tires are all "marked". BMW uses a Star on the sidewall, mercedes "MOE", Porsche "NO" etc etc. GM..... uses "TPC". If you get the TPC marking, regardless of where you purchase it, you are getting the exact same tire. Since they were mentioned, TireRack does a very good job of letting you know if they tires are designed for a specific manufacture. In C7 Z sizes, the only MPSS and M cup2s available are TPC spec so theres no chance of getting in wrong (at least for the current time). Im honestly not sure whats available for stingray fitment.

Originally Posted by Luke@tirerack

Many times tire engineers alter tires for a specific application, purpose or OE fitment. These changes can lead to dramatic performance differences even though the tire name, UTQG and appearance all remain identical to the original design. These "altered" tires are rarely discussed and the changes are, for the most part, considered proprietary information which doesn't get shared with the general public. Many times these types of altered tires are only seen on performance vehicles like the ZR1, a Dodge Viper SRT10 or a Porsche Turbo.

When people do find these "special build" tires in many instances they gain an competitive advantage just through tire selection.
Originally Posted by 2007 One Lap of America

Mid Ohio #1 - Time Trial - Results sorted by position Page 1
Pos Car # Vehicle Class Time Points

1 3 Dodge Hennessey Viper SSGT1 BB 5:00.571 435
Brian Smith, Nick Arevalo
2 1 Porsche 996 TT SSGT1 BB 5:07.871 430
Mark DaVia, Drew Wikstrom
3 14 Toyota Supra SSGT2 SB 5:08.041 425
Greg Caloudas, Leh Keen
4 2 Dodge Viper SSGT1 BB 5:09.325 420
Ronald Adee, Rick Schopp

question = how was 1 car over 7 seconds faster ?
answer = Pilot Sport PS2 C1

and since somebody will ask
question = why didn't it win overall ?
answer = car broke at 1 event and recorded a DNF
Originally Posted by 1 Lap of America

Miller Motorsports Park #1 - Time Trial
1 3 Dodge Hennessey Viper SSGT1 BB 5:11.379 435
Brian Smith, Nick Arevalo
2 14 Toyota Supra SSGT2 SB 5:17.340 430
Greg Caloudas, Leh Keen
3 8 Cheverolet Corvette SSGT1 BB 5:19.554 425
Steve Stubbs, Aaron Pfadt
4 1 Porsche 996 TT SSGT1 BB 5:21.466 420
Mark DaVia, Drew Wikstrom
For something a little more current

Quote:Originally Posted by Optima Ultimate Street Car Invitational

B.F. Goodrich Hot Lap Challenge
1. Danny Popp, #14 01:42.208 (25)
2. Pete Callaway, #45 01:44.749 (22)
3. Mark Stielow, #01 01:45.410 (20)
4. Kyle Tucker, #13 01:48.430 (18)
5. Gary Rubio, #34 01:48.441 (16)
6. Mike Maier, #50 01:48.721 (15)
7. Brian Hobaugh, #47 01:48.879 (14)
8. Filip Trojanek, #44 01:50.265 (13)
9. David Mikels, #42 01:51.319 (12)
10. Vincent Allegretta, #12 01:51.584 (11)

RideTech Street Challenge Autocross
1. Danny Popp, #14 00:38.251 (25)
2. Mary Pozzi, #15 00:39.414 (22)
3. Brian Hobaugh, #47 00:39.502 (20)
4. Pete Callaway, #45 00:39.626 (18)
5. Mike Maier, #50 00:39.654 (16)
6. Brian Finch, #11 00:39.658 (15)
7. Mark Stielow, #01 00:40.017 (14)
8. Kyle Tucker, #13 00:40.031 (13)
9. Gary Rubio, #34 00:40.117 (12)
10. Mark Rife, #53 00:40.167 (11)

Now, I will be the first to concede that Danny Popp is an excellent driver and a true hotshoe but, those other cars and drivers are not slouches. Most if not all of the other entrants had a significant horsepower advantage. Many of them were somewhere north of 1000+ hp while the white raft racer Z06 was pushing approximately 600hp yet it prevailed.

Why .... tire selection

here's the tire combo that Danny won the street car invitational with

345/30R19 Michelin Pilot Sport PS2 C1 (Dodge Viper SRT10 OE)
315/30R18 Michelin Pilot Sport PS2 N4 (Porsche GT3 OE)

both of these, as well as some other, specially engineered tires are rumored to have been manufactured using the same rubber compound found in Michelin's endurance racing tire the Pilot Sport Cup.

for your specific use I would suggest these
295/35R18 Michelin Pilot Sport PS2 N4 (2012 Carrera 4 OE)
345/30R19 Michelin Pilot Sport PS2 C1 (Dodge Viper SRT10 OE)

and before anybody asks yes, the Pilot Sport PS2 ZP used on the ZR1 is rumored to be one of those uniquely engineered tires as well

Originally Posted by Luke@tirerack (Post 1597635127)

ok ... now the discussion has changed. Yes atljar is correct tire manufacturers do alter tire designs to meet auto makers requires and in many cases the "OE" type tires are significantly faster than the "standard" versions.

I made this post on here several years ago
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