Jeep grand cherokee 2015 Owner's Manual page 497

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
EXAMPLE:
STARTING AND OPERATING 495
5