Dodge Challenger 2014 Owner's Manual page 340

338 STARTING AND OPERATING
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
15 = Rim diameter in inches (in)
Service Description:
95 = Load Index
– A numerical code associated with the maximum load a tire can carry
EXAMPLE:
I n f o r ma t i o n P r o v i d e d b y :