Custom 4X4 Off Road Extreme Adventure Spare Wheel Cover Universal for Hummer Trailer Custom Tire Protector 14 15 16 17 Inch Product Information Material: High Quality Polyester Size: 14 Inch, 15 Inch, 16 Inch, 17 Inch Package: 1 X Spare Tire Cover Cover Size Guide Tire Sizes Are Listed On Below Detailed Description, Please Measure Before Purchasing. Cover Size 14" Fits For Tire Diameter 60-69cm/23-27inch Cover Size 15" Fits For Tire Diameter 70-75cm/27-29inch Cover Size 16" Fits For Tire Diameter 76-79cm/29-31inch Cover Size 17" Fits For Tire Diameter 80-83cm/31-33inch Spare Tire Cover Diameter Calculation Guide 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 P225/65r17, A=225 B=65 C=17. Tire Diameter=A*B/500+C*2.54 =225*65/500+17*2.54 =72.43cm According To The Sizing Guide, 15" Spare Tire Cover Is The Size That Fits Your Spare Tire. Product performance : The silver-coated sunshade fabric can not only prevent dust and water splashing, but also prevent sun and corrosion, greatly improve the appearance of the vehicle and keep the spare tire clean. Applicable scenario : The universal model is applicable to jeeps, trailers, SUVs, trucks and many vehicles. Accessory structure : With nylon rope and buckle, it can be adjusted in size, easy to install and disassemble, without tools. Washing instructions : It is recommended to wipe and clean with wet cloth. Note: Please Allow 1~2 Cm Deviation Because Of Hand-Cutting And Sewing.