Just completed 2200 miles and had 4 rear flats (confirmed radial tire wires) in 2200 miles with the Supremes, which are showing wear, but not yet ready to be replaced. My XR's lasted 7500 miles with NO flats and only failed when the sidewalls blew. The Supremes were good on slushy snow over asphalt in conditions where I would be more cautious with the XR's.

I will be going back to the XR's for the rear and will use up the Supremes on the front and as a spare. The Plus Tour is WAY too heavy.