Find the tire sidewall
Read the tire size code, such as P215/65R15
Note the first letter
Identify the section width in millimeters
Identify the aspect ratio
Identify the construction type
Identify the wheel diameter in inches
Check the load index
Check the speed rating
Find the DOT code
Read the manufacturing date code
Check the maximum load
Check the maximum inflation pressure
Look for the treadwear, traction, and temperature ratings
Check the rotation direction if marked
Check the tire type markings such as M+S or all-season
Check the wear indicators on the tread