Review on Universal Fit Spare Tire Cover for Trailer, RV, SUV, Truck - Explore Land Tough (Fits Tire Diameters 20''-21.75'', Off-White) by Jay Kowal

I'm glad I read the reviews before buying. I have a 205 70R/16 spare on the back of my SUV and according to the chart I should have bought "Medium" - I've seen other reviews saying the caps are large and then look scruffy and wrinkled on the tire . .I dared and took "Small" - and it was a perfect fit. Nice and tight, but not too much. There are no wrinkles. I'm not saying it's the same for everyone, but I did. In general, the case is of good quality. If I can get away from that for a few years, I'll be happy.