I realize the 55-series rear tire is popular, and that was what was on the 2013 when I got it used last fall. I stayed with the 55-series when I replaced the tires this spring. When I rode to Austin this past weekend I planned my gas stops-station to station. Pilot Truck Stops that were 222 miles apart according to Google maps came up about 213 miles apart according to the bike. I makes me wonder if the taller tire is throwing off the odometer. The speedometer was right on according to my GPS, so that cannot be coming from the rear tire. I think for my next set of tires I'll go to 50-series. So, has anybody gone back to a 50-series rear tire after trying a 55-series?