Tire Covers For Rv Wheel 4 Pack Silver, Waterproof Uv Sun ProtectorsSize Selection Universal fit for 27 - 29 inch tire diameters (not the rim size). Perfectly compatible for RV, boat trailers, campers, jeep, truck and SUV. Refer to our fitting guide picture (in Details Page) for size selection. Mail me if you have any question about size selection. Premium MaterialRv tire covers is made of 4 layers heavy duty material. 100% rainproof snowproof and sunproof.The inner lining is soft cotton.So it is much more durable in any extreme weather. Hook DesignElasticized band and hook design keep the tire cover stay on the wheel even on windy days , ensures more secure fit, easy to put on and remove. FunctionWindproof, UV-resistant, Water-resistant, Non-scratch, Dustproof. The tire cover protect the tire from sun damage, corrosion and all types of weather when your vehicle is parked. Keep wheels in good shape and extend service life. Precautions Please pay attention to the size is the full tire diameter not the hub diameter. For 205 / 55R16, A = 205 B = 55 C = 16, Full tire diameter calculation formula is A * B / 500 / 2.54 + C = 205 * 55/500 / 2.54 + 16 = 24.9 inch. Replace the number 205 55 16 with your tire data then you will get your real tire diameter.