Hi edyvw,
I do.
To quantify how wear changes tire performance, the CR tire team measured the wet stopping performance and hydroplaning resistance of 23 performance all-season tires with full tread, which typically measures between 9⁄32" and 11⁄32", when new, and compared it against the same model tires shaved to 4⁄32".
New tire wet braking performance varies by model, sometimes by a lot. The span in stopping distances is between 127 and 175 feet. That’s about three car lengths of variation. If you frequently drive in wet weather, look for a tire model that scores well in our wet braking test.
Well, this is disappointing: I was expecting a full page chart with stopping distances--apparently they don't share that data?
Maybe they are afraid of being sued by the losers? They would win in court--I am sure their data is fairly derived and reproducible--but court costs can still kill you even if you "win".
Article jumps to recommended tires: Michelin Pilot Sport 4S, Michelin Cross Climate 2, Nokian Happawatta, Continental Extreme Contact, Hankook Winter icept, Bridgestone, BF Goodrich, Vredestein, More Michelins, Pirelli, etc--lots of subdata you need the subscription to see.
What I don't see: Low end tires like Sentury, Westlake, Arizonian, etc. They apparently (based on CR data) don't stop or turn a car as well as higher end tires.
Overall tire brand report card: top five are
- Michelin, 72 score
- Continental
- Vredestein
- General
- Bridgestone 65 score
Bottom five
- Falken, 60 score
- Firestone
- sumitomo
- GT Radial
- Nitto 53 score
Here they say what edyvw has been saying:
"No. 1: Michelin. Score: 72
Michelin is at or near the top of most tire categories we test. Typically, Michelin models offer a good mix of grip, handling, and long tread life. And even though Michelins are often among the most expensive models, they tend to be a good value when factoring in performance and tread life."
And hospital/medical/funeral costs. See above about NHTSB and worn tires being associated with more accidents.
Again, sorry CR doesn't show their data--maybe it was printed in the magazine version?
Incidentally, last year I was looking at replacing 4 tires on a 2 ton 300 HP GM sedan, and I looked at the Sentury tires closely. California car, not driven hard, etc. On paper, the Sentury tires looked good, and were less than half the cost of the Michelins I ended up getting. But, right after I put them on, California was hit with a series of big rainstorms, huge for California, more than doubled the usual annual rainfall, and I was very glad to have the Michelins driving in those storms. They handled the heavy rainfall well, tracked sure and true.
And no, not a Michelin dealer, and I don't get a commission there either.