The typical OEM setup for a 2009 Audi S5 with the factory 19-inch wheels is 255/35R19 in the front and 275/35R19 in the rear.
Beyond that quick answer, tire sizes on the S5 vary with wheel diameter and options. Some models rode on 18-inch wheels, which use different front and rear sizes, and wheel swaps or aftermarket tires can change what you see on the car. Always verify the exact sizes on your vehicle using the door placard or the tire sidewalls.
OEM tire sizes by wheel size
19-inch wheels
The following are the typical factory tire sizes for the 2009 S5 when equipped with 19-inch wheels.
- Front: 255/35R19
- Rear: 275/35R19
These sizes reflect the common OEM configuration for the 19-inch setup. Some models might list the tire type as 255/35ZR19, depending on the tire model and speed rating.
18-inch wheels
For 18-inch wheels, a common OEM configuration is:
- Front: 245/40R18
- Rear: 275/35R18
As always, verify with the door placard or vehicle documentation for your exact car, since wheel options and aftermarket changes can alter the sizes.
How to verify tire sizes on your car
To confirm the exact sizes on your vehicle, check the driver’s door jamb placard and read the tire sidewalls. The placard lists the recommended sizes; the sidewall shows the size of each installed tire (for example, “255/35R19”). If you’ve swapped wheels or tires, refer to the manufacturer’s specifications or your dealer for the correct sizes.
Summary
In summary, the typical OEM tire sizes for a 2009 Audi S5 are 255/35R19 front and 275/35R19 rear with 19-inch wheels, and 245/40R18 front and 275/35R18 rear with 18-inch wheels. Always verify the exact sizes on your car via the placard or owner's manual, especially if wheels or tires have been replaced.