Tires, P245/40R18 front, P275/35R18 rear, summer, run-flat

18" performance summer-only run-flat tires

  • P245/40R18 in the front and P275/35R18 in the rear
  • Run-flat performance tires are optimized for summer driving on dry and wet pavements

Run-flats can be driven up to 50 miles, and up to 50 miles per hour, under moderate load conditions after a loss of pressure, avoiding the hassle of waiting for a service truck. Do not use summer only tires in winter conditions, as it would adversely affect vehicle safety, performance and durability. Use only GM-approved tire and wheel combinations. Unapproved combinations may change the vehicle's performance characteristics. For important tire and wheel information, go to or see your dealer.