Fiat 500 Abarth Owner's Manual page 240

238 STARTING AND OPERATING
Tires designed to this standard have the letter "T" or
"S"molded into the sidewall preceding the size desig-
nation. Example: T145/80D18 103M.
Tire Sizing Chart
Size Designation:
P = Passenger car tire size based on U.S. design standards
....blank.... = Passenger car tire based on European design standards
LT = Light truck tire based on U.S. design standards
T or S = Temporary spare tire
31 = Overall diameter in inches (in)
215 = Section width in millimeters (mm)
65 = Aspect ratio in percent (%)
— Ratio of section height to section width of tire
10.5 = Section width in inches (in)
R = Construction code
— R means radial construction
— D means diagonal or bias construction
• High flotation tire sizing is based on U.S. design
standards and it begins with the tire diameter molded
into the sidewall. Example: 31x10.5 R15 LT.
EXAMPLE: