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It's heat. No matter how big your tires, the contact patch for the same pressure is exactly the same size. Narrower tires, however, have a long patch, which causes more carcass deformation than a wide patch, which causes more heat build-up.
Something Bridgestone touched upon in the press release. I guess they're getting around it with stronger sidewalls and higher pressures, which makes for a smaller contact patch.
The wet weather grip is no surprise. Wider tires hydroplane more than regular ones, and narrow tires tend to hydroplane less.
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