Protect your spare tire from the elements with this high-quality 15 inch soft tire cover. Made from durable PVC leather, this cover is designed to fit universally and is suitable for all travel trailers, RVs, campers, and Jeep Liberties. The cover features a sleek design and is easy to install, providing you with peace of mind that your spare tire will remain in top condition no matter where your adventures take you. Perfect for anyone who loves to travel, this tire cover is a must-have accessory for any vehicle.How To Calculate Your Tire Diameter by formula?Tire Diameter=A*B/500+C*2.54Example as below:If your tire is written with 215/60R16,A=215 B=60 C=16.Tire Diameter=A*B/500+C*2.54 =215*60/500+16*2.54 =66.44cm