For what it's worth, the oddball Tire Rack comparison involved the Pirelli PZ4, which is what came on my M3P. In most "max performance" (~ 300 TW) comparisons I found, a lot from Europe, it ranked poorly, and I can tell you why - for 280 TW it really doesn't grip that well dry or wet, and it squeals in hard driving like an allseason.
Yet Tire Rack liked it and even ranked it above my replacement tire choice, which I can tell you performs significantly better. I can't explain how the comparison ended up so skewed though. I'm sure tire makers (and automakers) have slipped in ringer tires for car mag reviews, but I would expect Tire Rack to pull from their regular inventory and not be susceptible to one-off cheater tires.
Maybe Pirelli gave them a big pile of cash with a wink, but to me that would be a really stupid long-term business decision if Tire Rack accepted that.
Maybe the PZ4 happens to work extremely well in the exact size Tire Rack tested...but not so well in the stock M3P size or the sizes used in other comparisons I read. That seems implausible to me but I can't rule it out.
I really don't know, I just know Tire Rack got that one wrong.
In the past I always felt pretty well-steered by Tire Rack's comparisons (get it?
), in multiple tire categories from snow & ice to HPDE use, but I'm glad I didn't trust this one and unfortunately I'll be a lot more skeptical going forward.