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Spare Tire Cover Description Package: 1Pcs Spare Tire Cover Material: Polyester (Waterproof & Dustproof & Anti-UV) Spare Tire Cover Sizing Guide 14" Fits for tire diameter 60~69cm 15" Fits for tire diameter 70~75cm 16" Fits for tire diameter 76~79cm 17" Fits for tire diameter 80~83cm Spare Tire Cover Diameter Calculation Guide Step 1: Find Your Tire Parameter. It’s written on your tire side Step 2: Calculate Your Tire Diameter If your tire is written with P225/65R17, A=225 B=65 C=17. Tire diameter=A*B/500+C*2.54 =225*65/500+17*2.54 =72.43cm According To the Sizing Guide, 14" Spare Tire Cover is the size that fits your spare tire.