Great product, I'm glad I spent a few extra bucks on cheap ones with bad reviews. I have used them with 285 75 17 tires on factory 17" wheels on my wife's 2013 jk wrangler and they fit the spare tire perfectly. I also used a 1" spacer as the tire barely rubbed the bumper. The combination of both provided a perfect fit and factory look without changing the third brake light. It also keeps the weight closer to the tailgate than many other options, reducing stress on the hinges. These shredders are a bit difficult to cut due to their high strength, but can be done relatively easily with a razor blade or hacksaw. It took me about 5 minutes to measure, cut and assemble (not counting the time to remove and reassemble the spare tire).