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Depending on the setup of your 2009 Subaru Impreza, it may have one of three different tire sizes. The 2.5i model has P205/55R16 tires on 16-inch rims, while the 2.5GT and Outback Sport versions have P205/50R17 tires on 17-inch rims. If you have the upgraded Impreza WRX, it will have P225/45R17 tires on 17-inch wheels. The recommended tire pressure for these tires ranges from 32 to 34 pounds per square inch for standard load versions, with staying closer to 32 psi being preferred for normal use. While the bolt pattern is consistently 5x100 with a 56.1mm center bore, it's important to have all four tires matching. While any of the tire configurations can technically fit your vehicle, changing sizes may require replacing all four rims and recalibrating the speedometer.
The factory-fitted tire size on my 2009 Subaru Impreza 2.5L Outback Sport model is 205/50R17.
The 2009 Subaru Impreza comes with 225/45R17 tires. The recommended tire pressure is 33 psi for the front and 32 psi for the rear. The wheels on the 2009 Subaru Impreza are 17 inches in size.