Michelin’s are unavailable? Two possible alternatives I have seen are the BF Goodrich G-Force Rivals and the Perilli P Zero Rosso’s, although the later ones are hard to find too.
Answer by Dan Cragin:
For 18 inch tires, I prefer the Pirrelli P Zero’s. They have a stiff sidewall and good tread wear. Turn in and grip are exceptional. I do not have enough experience with the Rival’s at this point to give a good opinion. My initial feelings are they have good ride quality like the Michelin’s, not sure how they work when pushed though.