Be sure to check inflation pressure when tires are cool (minimum 3 hours after driving).
Find manufacturers recommended inflation pressure located on the vehicle doorjamb, glove box, fuel door, or the owners manual. Note: the tire inflation pressure listed on the tire sidewall is the maximum pressure for the tire, not the recommended pressure for your vehicle.
Remove the valve cap, take the tire gauge, and press firmly on valve stem.
If the reading is lower than the recommended level, add air and check again.
Over inflated? Push on the metal valve core in the center of the valve with the nub on the back of the tire gauge to release air, and check again.
Once recommended inflation pressure is reached, replace valve cap.
CHECK THE TREAD
Insert the edge of a U.S. penny in the tire tread, with Lincoln’s head down and facing you.
If the top of Lincoln’s head is covered by tread, there is at least a minimum acceptable amount of tread.
If the top of his head is visible at any point around the tire, it is time to replace the tire.
CHECK THE OVERALL CONDITION
Visually check for cuts, cracks, splits, punctures, irregular wear and bulges.