QUOTE (Brandini @ Sep 8 2009, 08:28 PM)

I think you'll find that they explain their weighting to bias towards dry since they were upper level performance summer tires which sacrifice wet traction the higher level you go.... i think they're being more realistic of their test segment. Also, they showed wet braking because, well, it rains.
It is simply untrue, false, misinformation, disinformation that tires "sacrifice wet traction the higher you go." It is true that there is a separate category of tires designed for high speed, high temperature operation (street-legal racing tires), and tires of that description -- such as the Yokohama ADVAN Neova -- usually are one-trick ponies; Tire Rack, to which Car and Driver was beholden for the test, calls them "extreme performance" tires. In fact, the Car and Driver test group was explicitly of "economy" tires. It happened that one "extreme performance" tire made it under the $140 filter that Car and Driver imposed, the Dunlop Direzza Z1 Star Spec. Remarkably, the Star Spec fared o.k. in both wet and dry braking (probably reflecting high ambient temperatures at the time of the testing). The other tires were not in the "extreme performance" category.
Which leads into more Car and Driver misinformation:
QUOTE (Car and Driver)
There are now five categories of street tires designated exclusively for summer driving—grand touring; and high, ultra-high, maximum, and extreme performance. This category list is arranged in increasing dry-road capability, and those capabilities tend to produce trade-offs on tire wear, noise, wet performance, or all of the above.
Well, no. With the possible exception of the Dunlop Z1 Star Spec,
none of the tires in the Car and Driver test were "designated exclusively for summer driving." The Car and Driver copy writer (Dave Vanderwerp) simply has spent time reading advertising claims rather than doing his homework, and is showing his ignorance. The five categories (yes, we, too, used the same word above) to which Vanderwerp alludes are a marketing invention, not definitions of the Rubber Manufacturer's Association. And the only one of those categories that trades off wet performance is the "extreme performance" category -- but the "dry-road capability" that the extreme performance tires maximize is the ability to run at very high temperatures; it is not an increase in dry-road cornering ability, dry road braking, or dry-road rolling resistance. The "extreme" in "extreme performance" tires, in other words, is heat, not performance. The kind of tires that Car and Driver included in the test is the kind of tires that will give the driver
the best performance in the spring and fall, as well as the summer; those tires are
_not_ (snicker) "exclusively for summer" driving.
Again:
QUOTE (Car and Driver)
In the wet, the RE760s were generally below average, but their lap time was well above those of the three worst-performing tires, striking us as having sufficient chops in the wet for a summer tire.
The last four words in that sentence are a howl. "His leg strength struck us as having sufficient chops. . . for an NFL offensive tackle." The group of tires that Car and Driver calls summer tires is the kind that has the very best wet performance of any tires that one can purchase for a passenger car. Had all-season tires been included in the test group, it is likely that none of the all-season tires would have done as well in wet braking as the ninth-place Falkens.
And while we are on a roll, look at this statement:
QUOTE (Car and Driver)
At the time of this test, Michelin, Goodyear, and Toyo didn’t have any tires that qualified for our criteria, so we turned to their subsidiaries—BFGoodrich, Dunlop, and Nitto, respectively ...
BFGoodrich is a subsidiary of Michelin, and Nitto is a subsidiary of Toyo, but Dunlop is not a subsidiary of Goodyear. The Dunlop brand is jointly owned by Sumitomo and Goodyear; broadly speaking, Dunlop tires made in Europe are made by Goodyear or its Fulda subsidiary, and Dunlop tires made in Asia are made by Sumitomo; the Dunlop Direzza Sport Z1 Star Spec tires are made in Japan. (At one time, Goodyear owned some shares of Sumitomo stock,but we do not know where that stock ownership stands now.) Again, it appears that Vanderwerp failed to do his homework before going to his word processor.