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For better traction, the Q60 has larger standard tires than the A5 (255/40R19 vs. 245/40R18).
The Q60 Red Sport 400’s 275/30R20 rear tires provide better handling because they have a lower 30 series profile (height to width ratio) that provides a stiffer sidewall than the A5 Premium Plus/Prestige’s optional 35 series tires.
For better ride, handling and brake cooling the Q60 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the A5. The Q60 Red Sport 400’s 20-inch wheels are larger than the 19-inch wheels optional on the A5 Premium Plus/Prestige.
The Q60 has a standard easy tire fill system. When inflating the tires, the vehicle’s integrated tire pressure sensors keep track of the pressure as the tires fill and tell the driver when the tires are inflated to the proper pressure. The A5 doesn’t offer vehicle monitored tire inflation.
Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the Q60 can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The A5 doesn’t offer run-flat tires.