You should not judge cold grip by treadwear rating. There's not going to be much if any meaningful correlation. Even at the same treadwear rating some tires are optimized to have more grip sooner at colder temps and some are optimized to have grip that lasts for many laps at hotter temps.
I would put money down on the RE71R vs. S007A for initial cold grip at, say, 55F temps. But I'd also put money down that any difference between the two for street driving is going to be negligible for all practical purposes.
Tire Rack tested and compared these two tires, along with the S-04, on the street and on their track:
https://www.tirerack.com/tires/tests...y.jsp?ttid=239
Road test suggests RE71R superiority as far as performance. Track and slalom results: S007A's wet performance is a bit disappointing, way down from the dominating RE71R and not as good as S-04 either.
If anything it seems to me the RE71R probably has better grip when cooler, if wet grip is any indication.
Quote:
Originally Posted by venturaII
Not saying they can't be driven on the street, but any tire in the 200TW category are going to be further from their peak grip temps than a more street oriented model like the S007A with it's 240TW rating. Given that OP only does a few events a year, he'd be better off with a tire that was closer to it's optimum operating temp and only giving up a small amount of peak grip in exchange for not needing to come up to temps as much, so he'll have potentially more grip available immediately..
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