【Size】Usually fits for your tire size marked is 145/70R13, 155/65R13, 155/70R13, 165/65R13, 135/70R14. If you have any question about size selection. Please contact us feel free. 【Size Selection】Universal fit for 19 - 21 inch ENTIRE TIRE DIAMETER (⚠️ not the rim size). Please choose the suitable size of tire cover according to our size guide chart (or by calculate formula: For example your tire size marked is P145/80R12, A=145 B=80 C=12 Diameter=A*B/500/2.54+C=145*80/500/2.54+12=21.13 inch，then you should to choose the size XS for Tire Diameter 19-21 inch.) Moonet tire covers helps guard against sun, rain, mud, and other elements, messes. And tire covers can be wiped or hosed off. Perfectly compatible for RV, boat trailers, campers, jeep, truck and SUV. Refer to our fitting guide picture(in Details Page) for size selection.