I mount my own tires. I just took my well worn rear tire from my 2018 SGS. I pulled a new tire off my shelf, which I had purchased for my 2016 SGS, only to find that the 2016 was a 16" wheel and for 2018 they went to an 18" rear tire. Just a heads up so people do not do what I did and have 2 new tires that are the wrong size waiting to be installed.