2009 GMC Sierra 1500: What is the tire size and pressure, and wheel size?

The tire size of the 2009 GMC Sierra 1500 is 265-65-18. Tires that contain the specified amount of air pressure last longer and contribute to vehicle safety. Low tire pressures affect braking distances and provide leSSResponsive steering and handling. This can be especially dangerous when an emergency stop or sudden evasive maneuver is needed to avoid a collision.Inflation pressure affects every aspect of the tire, including the load carrying capacity, tread contact patch shape where the tire touches the road and size and handling characteristics. If a tire is underinflated, more heat is generated inside of it, and this could cause structural damage meaning You may have to replace the tire much more often.