Bare tires are only fit for workboats at a working dock. They are simply not "yacht" (sniff
20 years ago my wife came home with an armful of 3 1/2" X 5' solid pool noodles (no hole down the center). As soon as I saw them I realized she had bought them to use as dock edging. They are closed cell foam and cost next to nothing - especially at the end of summer at dollar stores.
I lashed them in place using lengths of old sail ties screwed to the float with stainless screws and fender washers. They worked exceptionally well - if a fender flips up you are still completely protected. If you misjudge and rub the dock - nada.
They will deteriorate from UV - lasted three years here before they started shedding. You have two choices about that - spend $20 every couple of years for new ones or spend a bunch more and make up covers like those sold for fenders. If I could use a sewing machine I'd make covers colour coordinated to the boat but as it was I simply used noodles that were colour coordinated to the boat.
After I implemented her idea we started noticing other people using them in the same way - should have patented the idea.