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I've recently driven the RE-71R and R-S4 a couple weekends apart... The RE-71R has noticeably superior grip, and just as importantly they break away gradually. I found the R-S4s give less notice before they surrender grip, so I don't have the same confidence pushing them through high speed sweepers.
The RE-71Rs lasted 5 track days. Next time I'll flip them left to right (I run staggered) with the tread direction backward to get a couple more days out of them. The R-S4s tolerate heat extremely well (was over 40 psi before they greased up, that was my fault) and the wear is far superior.
But I'd kinda rather have the grip and confidence.
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America is all about speed. Hot, nasty, badass speed. - Eleanor Roosevelt
'17 BMW M2
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