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In regards to your friend liking them on the 4RS, they may feel totally fine on that car as the spring rates are MUCH higher. While I am running 80/100 on mine w/ MCS dampers, the 4RS is stiffer still, so a softer sidewall tire might not be as much of an issue on it.
While I respect your opinion, I can’t say I share the same feeling towards the A052, given the firsthand feedback I’ve gotten from my fellow track buddies in both the GT4 RS and GT4–all on OEM suspension. Quite a few skilled folks putting in very fast laps across varying tracks—lots of positive feedback on the tire with the only drawback being that it starts to lose time (not composure) after a handful of laps in a given session. It’s a true time attack tire. I would recommend it to any GT4 or RS owner looking for a very fast track tire that’s willing to give up some longevity for outright pace.
I love that we have options, with each tire having its unique characteristics and tradeoffs. I’ve found it enjoyable to learn how to get the most out of each tire while pushing for the fastest times I can. We can all have different preferences that suit our driving style and abilities.
Best of luck with your journey in dialing in your setup to your liking. We’re blessed with so many good tracks here in NorCal. Even one or two days a year can be a great way to learn and satisfy the itch. And the per diem insurance for the GT4 is much more affordable than the RS. But we do all enjoy our cars in our own way. Have fun and be safe!