Izzone

While at the Sebring race this weekend I spent some time at the Michelin tent

After I pleaded my case that the need real sport cups in proper 18" fit at ra1 price point I asked about the supersport

The Michelin engineer said the gt3 rs rear fit will be out in the fall.....Michelin plans to introduce "n" sizing of the tire with the "special" gt3 version coming out.

If true, great......but really a gt3 on a "better than ps2" tire.

Targa Tim

Great news, I will need a set for daily drive and wet track.

CRex

This may come just in time as I'll need a set of DD replacements after my OEM MPSCs wear out.

Carrera GT

I've been told by some folks at Porsche that the lap times of a GT3 running PS2 versus Sport Cup is a negligible difference. Appearances can be deceiving. The PS2 might not be as enjoyable to drive at the limit, but it doesn't lose much in performance. I know that's hard to believe, but there it is.

CRex

Hardly a shocker... the MPSC+ (N-specs) are really just glorified PS2s. On a short track they're typically within a second of each other. Even the tread patterns are eerily similar. The original MPSC is another story but obviously they're no longer made.

This PSS should be interesting. Can't wait for actual user feedback.

GT

Sorry quick question regarding above post; the newer mpsc+ tires are not just a newer/stickier version of the original mpsc tires? Are the new ones more road oriented (less track)?
If that is the case then were would the Corsas stand in the comparison?

Carrera GT

I think the N2 Sport Cup is designed to handle the weight/power of the GT2 RS -- that would make it a tad less sticky, so to speak. In any case, about the most expensive tire on the planet and Sport Cups are mediocre tires at best.

Carrera GT

I think we can hope for the oddly labeled "SS" tire to work well on wet roads (or tracks) and do a lot (lot) better job of dealing with the heat of track sessions. The advantage would be an all-weather track tire with lower operating costs making it a good compromise between Pirellis and Hoosiers.

CRex

The MPSC+ is newer but definitely not better. Cup+ has wider (and one extra) longitudinal rain grooves to improve wet handling.

A picture's worth a thousand words:
https://rennlist.com/forums/wheel-an...he-n-spec.html

The original Corsas (non-system) are comparable to the original Cups. On the other hand, Corsa Systems are comparable to MPSC+'s--both are "detuned" and hence OEM-qualified. I've run one set each on my .1 and found them to be very similar--maybe slight advantage to the MPSC+ for consistency but that's more butt feel than science.

nash

Really, they don't make MPSC (generic, not N Spec or Plus) anymore at all? Thanks for the link, I had no idea that the + version was actually inferior...

FTS

Yes, that is really hard to believe for me. I can understand it is a lot about driver confidence to get the most out of the tires, but I just hated the PS2s. Also, as you know so very well, it is not a matter of just pulling a great time for one or two laps, but I found the PS2s rolling over and playing dead after 15-20 mins having a heat stroke. At least Cups last a long while.

Larry Cable

I checked with my contact at Michelin US; there will be no additional sizes released beyond those at launch until early 2012; additionally N-spec fitments (Porsche homologations) will be "select" i.e it will not necessarily be a simple replacement of Super Sport N-spec fitments for existing PS2 or MPSC+ N-spec fitments.

Further there is no comment on the 4.0 GT3RS LE equiped with N-spec 325/19 Super Sport fitment.

If we as a community want a 325/30-19 fitment (which is only a Porsche dimension, and therefore only a homologation candidate) then we will have to lobby Michelin and Porsche for this.

Same applies for 305/18 rear fitment for 996.2 etc ...

Carrera GT

I don't think 325 will cut it. 345 would be nice.

Perhaps the product guys at Michelin can explain why they're producing a 22 inch PSS and the front tire sizes for a 911, but not the rear ...

911SLOW

It's a conspiracy.

Larry Cable

I am assuming those are Cayenne fitments or similar ... I think the front 911 fitment is an "accident" since it is a common dimension.

I have to assume there is some logic behind this, a combination of manufacturer and existing market anticapated demand.