Per-Gull Happy Camper Spare Tire Cover Waterproof Dust-Proof Universal Spare Wheel Tire Cover Fit for Jeep Trailer Rv SUV Truck and Many Vehicle Camper Accessories 15 Inch

14" For Diameter 23"-27". 15" For Diameter 27"-29". 16" For Diameter 29"-31". 17" For Diameter 31"-33" How To Calculate Your Tire Diameter ? If Your Tire Is Written With P215/60r16, A=215 B=60 C=16. Tire Diameter=Axb/500+Cx2.54 =215x60/500+16x2.54 =66.44cm, You Need To Buy The 14 Inch One. This Product Uses Waterproof Fabric, Not Only Dust-Proof And Waterproof, But Also Sunscreen And Corrosion-Proof, Greatly Improving The Appearance Of Vehicles And Keeping Spare Tires Clean. 1.Universal Models Are Suitable For Jeeps, Trailers, Rv, Suv, Trucks And Many Vehicles. 2.With Nylon Rope And Buckle, Adjustable Size, Easy To Install And Disassemble, No Tools Required. 3.Washing Instructions:Clean With A Rag. If You Have Any Problem,Please Contact With Me,I 'D Love To Help.