Material: Made Of Strong Fabric, Not Only Dust-proof And Water-proof, But Also Sunscreen And Corrosion-proof, Greatly Improving The Appearance Of Vehicles And Keeping Spare Tires Clean. No Tools Required: It Is Easy To Install, Remove And Clean. OCCASION: Universal Models For , Trailers, RVs, SUVs, Trucks And Many Vehicles Fittings Construction: With Nylon Rope And Clasp, Adjustable Size. Washing Instructions: Use A Rag To Wipe It Clean. Package: 1Pcs Spare Tire Cover. Size Guide: Tire Covers Size 14"" Fits For Tire Diameter 60~69cm Tire Covers Size 15"" Fits For Tire Diameter 70~75cm Tire Covers Size 16"" Fits For Tire Diameter 76~79cm Tire Covers Size 17"" Fits For Tire Diameter 80~83cm How To Calculate Your Tire Diameter? 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 P215/60R16, A=215 B=60 C=16. Tire Diameter=A*B/500+C*2.54 =215*60/500+16*2.54 =66.44cm You Need To Buy The 14"" Cover.