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For better traction, the GT-R has larger front tires than the 911 (255/40R20 vs. 235/40R19).
The GT-R’s 255/40R20 front and 285/35R20 rear tires provide better handling because they have a lower 40 series front and 35 series rear profile (height to width ratio) that provides a stiffer sidewall than the 911 Dakar’s standard 45 series front and 40 series rear tires.
For better ride, handling and brake cooling the GT-R has standard 20-inch wheels. Smaller 19-inch front wheels are standard on the 911.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the GT-R can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The 911 doesn’t offer run-flat tires.