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I like the RE71RS, but not for long sessions in moderate to high ambient temps, especially on cars above 3,200 pounds. RS4 was great for throttle steering and wear characteristics in longer sessions, even in 90+ degree temps. I love my RT660, and have returned to them on multiple platforms since my initial experience with an ND2 endurance build a couple years ago. RT660s are pretty good about wear and consistency even in high heat conditions. However, they almost always splice at the tread after a heat cycle or two. Supercar 3R lateral grip is awesome for a DOT streetable tire, but it’s not as durable in high heat and long sessions as I’d prefer. I like to run 10+ laps per session without cooldown laps, or at least without more than a two percent reduction in pace for “cooldown” purposes.
All this said, my latest experiment is with Nankang CR-S V2 on my F80 CS. I liked them a lot in 95+ degree ambient temps. Pretty fast but with confidence (first day out to shake down F80CS completely stock but with DSUNO front pads and ran 2:00:** in almost 100 degree weather), consistent in high temps and long (25+ minute) sessions (deltas were within half a second for 6+ consecutive laps), quick to come up to temp, progressive breakaway (albeit not much sound), and decent feedback. Pretty stiff sidewalls, no tread splicing, no chunking, no unexpected surface degradation or delamination. I’ll be putting more days on these before reaching a verdict, but I’m already considering swapping my regular M2C setup (square 275 RT660) for square CR-S once my RT660s are toast.
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