FINGERINSPIRE Happy Camper Spare Tire Cover Universal Wheel Covers Waterproof Dust-Proof Tire Protect Cover for RV Travel Trailer Camper Truck SUV?15" Fit 27-29 Inch Tire Diameter?

Features: 
-Refer to our fitting guide picture for size selection, fits entire tire diameter from 27.5"-29.5", it’s NOT the rim size.
-How to calculate your tire's diameter: 1.Choose model as size chart 2.Measure the tire diameter for your tire to choice. 3.Calculate your tire diameter. For Example: Tire "225/55R17" Tire Diameter=22.5x0.55x2+17x2.54=67.93cm/26.7inch Just replace the numbers 225,55,17 with real tire data,you will get the right date.
15" fit 215/65R16?225/55R17?235/50R16?235/75R15?245/75R15?255/55R17 type tires.

Specifications: 
Material: Polyester
Pattern: Happy Camper