Find the tire sidewall markings
Read the tire size code, such as P215/65R15
Identify the tire type letter
Read the section width in millimeters
Read the aspect ratio as a percentage
Identify the construction type letter
Read the wheel diameter in inches
Check the load index
Check the speed rating
Find the DOT code
Read the manufacturing week and year from the DOT code
Check the maximum load rating
Check the maximum inflation pressure
Find the treadwear, traction, and temperature ratings if present
Check the rotation direction if marked
Check the load range or ply rating if marked
Look for the tire’s service description
Verify the recommended vehicle fitment in the owner’s manual or door placard