I have been looking for better options for the rear tire on my 2019 GSA mainly to get better mileage but also a larger footprint. When I had my BMW RT I had someone make a rear wheel spacer so I could mount a car tire on it and it worked great. So, I had the same person, Jim Ryan, make a spacer for my GSA so I could try different types of tires on it and see what gives me the best feel and mileage. The spacer with extra bolts arrived today.