Acoustic Reduction Tires, or other choices?

What are the two different ME tires options? First taking a look at what we think at the C8’s tires specs:

Clearly looking at the there’s a typo, for both sets will be 19” fronts, 20” rears. We know exact tire sizes and that at least one set of the C8’s tires would be Michelin 4S’s.


But what about the two different ME tire option codes.? What makes them different? I noticed something when staring at the specs, that one set has “RF4”in them. As that does not stand for “right front,” IMO represent that one set is run flats, and perhaps the 4 stands for Michelin PS4’s. So is the other option not a run flat tire as it does not have either a “RF” in it not a “4” thus the second set not being PS4’s but instead something else?
Earlier I had asked whether one set was for all seasons? meyerweb responded that he thought probably not, and instead suggested one set could be the the Cup 2 tires. However, we have never had Cup 2 tires on any Stingray before. Doesn’t mean GM can’t change this up, but has not GM always, when one got Cup 2’s, they were automatically paired with carbon-ceramic brakes paired? As of yet however, we have not yet seen C-C brakes as an option for the 2020 ME.
I conclude, maybe erroneously, that perhaps as the Michelin 4S tires (option XFQ) are runflats (no surprise there), but what about the second second (option code XFN); are they non runflat versions of the PS4 (which Michelin also makes), or Cup 2’s or all seasons Michelin A/S 3+ tires? Might GM be giving us a completely different second tire choice?
Or is there another option for our consideration, that could second option code set of tires be the fairly new Michelin Acoustic tires?

https://www.michelinman.com/US/en/wh...echnology.html
What are the two different ME tires options? First taking a look at what we think at the C8’s tires specs:
Clearly looking at the there’s a typo, for both sets will be 19” fronts, 20” rears. We know exact tire sizes and that at least one set of the C8’s tires would be Michelin 4S’s.
But what about the two different ME tire option codes.? What makes them different? I noticed something when staring at the specs, that one set has “RF4”in them. As that does not stand for “right front,” IMO represent that one set is run flats, and perhaps the 4 stands for Michelin PS4’s. So is the other option not a run flat tire as it does not have either a “RF” in it not a “4” thus the second set not being PS4’s but instead something else?
Earlier I had asked whether one set was for all seasons? meyerweb responded that he thought probably not, and instead suggested one set could be the the Cup 2 tires. However, we have never had Cup 2 tires on any Stingray before. Doesn’t mean GM can’t change this up, but has not GM always, when one got Cup 2’s, they were automatically paired with carbon-ceramic brakes paired? As of yet however, we have not yet seen C-C brakes as an option for the 2020 ME.
I conclude, maybe erroneously, that perhaps as the Michelin 4S tires (option XFQ) are runflats (no surprise there), but what about the second second (option code XFN); are they non runflat versions of the PS4 (which Michelin also makes), or Cup 2’s or all seasons Michelin A/S 3+ tires? Might GM be giving us a completely different second tire choice?
Or is there another option for our consideration, that could second option code set of tires be the fairly new Michelin Acoustic tires?
Originally posted by Michelin
https://www.michelinman.com/US/en/wh...echnology.html
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