Toilets

So why is it these new psc 2 tires are claimed to be better than the cup tires from the ZR1?

I ask because the standard cup tires are a 80 wear vs the new cup 2 tires on the Z07 are a 130 wear. Wouldn't this signify that the older cup tires have more grip and are a softer compound?

URBAN LEGEND

Michelin is a fantastic tire company. The hot tire for the past few years has been the MPSS.
Michelin found a way to deliver grip and also provide thousands of extra miles of tread life with that tire.

Maybe they played with the compounds and applied the latest knowledge on the new SC2s.

jdmdohcpower

100% compound is different

AzDave47

When the PSS originally came out (300 wear rating) people wondered if it was a grippy as the PS2 (220 wear rating). It is clear that M learned a lot about tire compounds and technology between the design of the PS2 around 2000 and the PSS about 2012 and gets both better grip and wear out of the newer tires.

The same learning and progress applies to the PSC and it's successor PSC2. The wear rating on the new PSC2 ZP's on the Z07 is 180.

PRE-Z06

Being a bi-compound tread, I wonder if they chose the harder inner instead of softer outer this time around as I can't imagine it's an average. Numbers may not even be directly comparable anymore, things could have changed in the rating and the hardness scale isn't a standard across the board between manufacturers anyways so they can skew them however they want in reality.

AzDave47

On cars where the tires can be rotated to all positions, M warranty's the tread life of the PSS at 30K miles. On staggered fitment like the Z06 it is 15K.

The Cup and Cup2 tires are considered track tires and have no mileage warranty.

EVL-C8

Would Nitto Invo's be a good daily driver tire?

AzDave47

Not if you expect to use the power. They are inexpensive, quiet and get good treadwear. They are not a performance tire.

shaark92

wow. what a rabbit hole one enters in 2021 trying to replace C5Z OEM tires (wheels)

I spent over an hour at Discount Tire with a trusted/knowledgeable service agent. I've done lots of work with them in the past, they outfitted my '61 Impala last year.

anyhow ... I ended up getting Cray's Scorpion wheels (found a crack on the LF wheel during the alignment/balance operation) ... and Michellins ... 18" all around. 9" on the front, 10.5 on the back. Ordered 'em, that is.

hopefully by next week, Val will have new shoes.

user0405240328

Treadwear numbers alone are a poor way to compare performance between tires. Many cases where higher treadwear tires are actually better performing than a lower treadwear. I would take it as a very rough indicator only.

SladeX

Treadwear indicator is very hard to judge how grippy a tire is or how long they last when they are at this level of performance. Trust the advice of the members here who jave burned through half a dozen sets already for a better clue.

For track use up to 8/10 skill level, you have toyo r888r and will be good in cooler temps and has street grip available up until you try to get to top level track performance then it falls off. Trade off is its noisy.

PSS is the default compound, quiet on streets, can push up to 8/10 on track, lasts around 15k tops. Trade off is that not so good in cooler temps, requires it to warm up to get some grip especiqlly if compared to other options.

PSC2 tires are track tires but with a caveat, good for 10/10 driving when new, falls to 9/10 after a few hard laps then is 8/10 till end of life. If track is avoided can last 8 to 9k tops. As loud as pss, grips poorly when cold, terrible in both cooler temps and in rain.

Now some caveats; a factory or dealership alignment will halve the usable life of these tires or worse. GM default alignment is a crapshoot, and most leave the factory with bad toe, too much camber and uneven caster. You need a true alignment shop that knows these cars and have a rear caster tool. That is the litmus test question to see if they can do the specs described in the searches.

To get max mileage needs a street alignment. This alignment will wear poorly when used on track. There's a ton of info when searched, but basically be sure to temper your expectations according to the use you intend for your car.

57gman

Man oh Man.... I just saw this post by accident. It's not current any more. My Michelin A/S Sport run flats are 7 plus years old but only have 17,000 miles on them. Its in hibernation mode now.

jipper

just curious on a c7z how the power delivery on a warm temp day is with AS3 or AS4s versus the summer tire setups…can you put down the power or is it spin city

car2fast4you

My Z will spin the AS4 tires pretty easily. Traction control will also kick in when accellerating out of a turn. I can't wait until spring to get the summer tires back on.

jipper

do you have 2 sets of tires? I thought it was kinda tough to store them and not get dry rot ?