Tire Sizing Chart

EXAMPLE:

Example Size Designation: P215/65R15XL 95H, 215/65R15 96H, LT235/85R16C, T145/80D18 103M, 31x10.5 R15 LT

P = Passenger car tire size based on US design standards, or

"....blank...." = Passenger car tire based on European design standards, or

LT = Light truck tire based on US design standards, or

T or S = Temporary spare tire or

31 = Overall diameter in inches (in)

215, 235, 145 = Section width in millimeters (mm)
65, 85, 80 = Aspect ratio in percent (%)

  • Ratio of section height to section width of tire, or

10.5 = Section width in inches (in)
R = Construction code

  • "R" means radial construction, or

  • "D" means diagonal or bias construction

15, 16, 18 = Rim diameter in inches (in)

Service Description:

95 = Load Index

  • A numerical code associated with the maximum load a tire can carry
H = Speed Symbol

  • A symbol indicating the range of speeds at which a tire can carry a load corresponding to its load index under certain operating conditions

  • The maximum speed corresponding to the speed symbol should only be achieved under specified operating conditions (i.e., tire pressure, vehicle loading, road conditions, and posted speed limits)

Load Identification:

Absence of the following load identification symbols on the sidewall of the tire indicates a Standard Load (SL) tire:

  • XL = Extra load (or reinforced) tire, or

  • LL = Light load tire or

  • C, D, E, F, G = Load range associated with the maximum load a tire can carry at a specified pressure

Maximum Load – Maximum load indicates the maximum load this tire is designed to carry

Maximum Pressure – Maximum pressure indicates the maximum permissible cold tire inflation pressure for this tire
Parent topic: Tire Markings