Rguy271

I recently got finspeed wheels, which came with Sport Cup 2 tires, but NOT the Zero pressure onces (known as PSC2 ZP). At a cars and coffee this weekend, I noticed how the tires on the Z07s all looked so damn worn, even when the cars were barely used. Mine, with 1000 miles on them, look mint.

Does anyone know why the difference? Why does a ZP tire look as if half the tread is worn off right from the factory?

Pics for reference. Z07 tires:


Same tire, just not ZP.

dcher

I went to the Michelin website and it seems they may have a new generation version of the Sport Cup 2s with thicker tread. My Z07 was delivered last March with the original SC2s that looked almost like slicks when they were new. They lasted about 7K miles and now I have Pilot Sports. My question is whether anyone can confirm whether there is a new and improved generate SC2?

CGZO6

Tire rack lists the tread depth as:

Cup 2 ZP - 5.9 front, 5.7 rear.

Cup 2 non ZP - 7.2 front/rear.

So non ZPs get you 18% more tread for front and 20% more for rear.

Tread wear rating is 180 for both, and non ZPs are less $$.

What sizes are you using? Any issues w/TC or AH due to diameter diff?

dcher

My new Pilot Sports that I used as replacement tires are the ones that come with the standard Z and they fit fine. I presume my original Sport Cup 2s were ZP. My question is whether all of the Sport Cup 2s are now the non-ZP? I am contemplating what my next tire will be and I would prefer to go back to the SC2s if they have more tread than the previous generation.

Poor-sha

I was at the track last year with a guy who had a 991 GT3. The OEM MPSC2 (non-ZP) for the 911 look like the ones you bought. I believe the ZP variant is a special design for the Corvette.

dcher

On the Tire Rack website I could only find the ZP tires. How does one find the PSC2 non ZP?

CGZO6

The OPs pics are of 2 different Sport Cup 2s. One is the Zero pressure version (runflat) that the Z07 optioned Z06s come with. The other is of the regular (not runflat) Sport Cup 2s.

The Non RF Cup 2s are not made in the exact sizes as the stock Z07 RF Cup 2s. Hence my question about the OPs sizes/potential issues w/ the regular Cup2s he has on his Finspeed wheels (19/20? or I'm assuming they are 18s).

CGZO6

Think the OP did this with Finspeed 18s. Correction 19x10/20x12 setup w/front 285/35 and rear 345/30/20 Sport Cup 2's (non-runflats).

https://www.corvetteforum.com/forums...ger-tires.html

lpw016

I'm going to replace my rears soon-- 9.5k miles on them.

I have a non-Z07, so can I put the PSC2 ZP on the rears and keep PSC2 on the front?

cheet_code

They are different tires any way you slice it.

The ZP tires should never be used in the rain or cold weather. They also use a different compound and heat range, hence Michelin's warning not to mix the 2 tires. They are a "Competition Tire". Basically they are track tires. If you are not careful they will quickly get you in serious trouble in cool weather or wet roads.

The non ZP tires are also a "Streetable Competition Tire" but they are far better for rain, cooler weather etc, still not great but much better. They are also a good track tire as well. I have used both and would never use the ZP tires again, unless they were for a "Track Only" setup. Just my 2 cents

CGZO6

Mixing RFs with non RFs is a No! Not safe.

Assuming you still have the stock Z06 Michelin PSS on front (runflat), you "could" put the Cup2s RFs on the rear. But, the Cup2s will hydroplane a lot easier than the PSS would.

lpw016

Thanks for the response. I'll stick with the PSC2s for the rears.

ChopperDan64

Took my 16 Z07 with SC2's for a state inspection last summer, had about 500mi on it. BTW, this is a tire store I took it to. When completed and I went to pay, desk clerk told me the tech said I only had 4/32 of tread left and it was time to replace the tires. I stood looking at him for a few seconds to see if he was screwing with me. You sell Michelin here? Huh, yes. Well I won't be buying any replacements here.

cruzc5frc

I know I'm late to the party, but why would you still go ZP if they were track only, is there any track difference between non-ZP and ZP? I feel like non-ZP should have better track performance?

thebishman

Both are SC2s, but probably have markedly differing construction besides the fact one is a ZP tyre. Meaning the 'rubber' compounds are probably very different, as the SC2 ZP is made specifically for the Z06/7 iirc and to GM's spec for the car.

Bish

cruzc5frc

I have acquired an OEM set of wheels and TPMS sensors to dedicate to my new set of SC2's (I'm looking to order today), my question is should I be trying to find the non-ZP since they are going to be track dedicated?

cruzc5frc

The problem is tirerack.com only shows ZP, so also calling Michelin to see if they make both non-ZP and ZP in my C6 ZR1 wheel sizes.

fleming23

I personally don't think you should be trying to find the non-run flats. There is a reason why competition tires offer a shaved option. Tread has a tendency to roll over and can lead to chunking and other premature wear. The "slicker" tire is going to be the better bet, especially if you are using it exclusively for tracking. I suppose there may be an argument that the non-ZP tire could last longer if you didn't abuse them but I can't say for sure and would expect the difference to be minimal at best.

cruzc5frc

I can understand that and looks like ZP might be the only route anyways.

I do see the shaving and heat cycle options and curious if having someone like tire rack perform those services and not worrying about wasting a track session trying to get it done right without the 24 hour waiting period.

http://www.thechicagogarage.com/foru...eat-cycle.html

thebishman

I definitely wouldn't get them shaved as there's not much tread on them to begin with. This of course if you're driving the car to the track instead of towing it. Heat cycling? Maybe. But if you can throw your track wheels/tyres on the car and get them as warm as possible on the street, then park the car for >24 hours, you'll be getting close.