Jeep Grand Cherokee 2020 Owner's Manual page 350

348 SERVICING AND MAINTENANCE
NOTE:
P (Passenger) — Metric tire sizing is based on

US design standards. P-Metric tires have the
letter "P" molded into the sidewall preceding
the size designation. Example: P215/65R15
95H.
Tire Sizing Chart
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)
European — Metric tire sizing is based on

European design standards. Tires designed
to this standard have the tire size molded
into the sidewall beginning with the section
width. The letter "P" is absent from this tire
size designation. Example: 215/65R15 96H.
LT (Light Truck) — Metric tire sizing is based

on US design standards. The size designation
for LT-Metric tires is the same as for P-Metric
EXAMPLE:
tires except for the letters "LT" that are
molded into the sidewall preceding the size
designation. Example: LT235/85R16.
Temporary spare tires are designed for

temporary emergency use only. Temporary
high pressure compact spare tires have the
letter "T" or "S" molded into the sidewall
preceding the size designation. Example:
T145/80D18 103M.