SIZE S (14") FIT FOR: diameter 60~69cm
SIZE M (15") FIT FOR: diameter 70~75cm
SIZE L (16") FIT FOR: diameter 76~79cm
SIZE XL (17") FIT FOR: diameter 80~83cm
For example,your tire is P225/70R15, A=225 B=70 C=15
Diameter=A*B/500+C*2.54=225*70/500+15*2.54=69.6cm
Note: "R13-17" just means that your tires's Rim diameter is 13-17inch, not means you need the 13-17inch Tire cover.
You need confirm the overall diameter of your tire.
Overall diameter=section diameter * 2 = Rim diameter
Package Included:
1pc wheel tire cover