I've been at touring rallies and have heard grizzled high-milers say things like, “Now, this here Metzeler front's got twenty-three thou on it right now, but you shoulda seen the Dunlop I had before. That one…” Why is tire life so anecdotal? Because the conditions of use vary so widely. Dunlop technicians attending such rallies say that 40 percent of the bikes they check have under-inflated tires. Under-inflation means greater rubber flexure, which generates more heat and becomes a higher continuous operating temperature. The hotter the tire runs, the faster it wears. A touring rider I know does most of his long distance in the fall, because he likes cool weather. Others hustle up the Rockies with full luggage, passenger, and trailer at 85 mph in August. Rates of tire wear will differ in those cases. Another determinant of a tire’s operating temperature is speed—higher speed means more flexures per second as the normally round tread profile flattens at it enters the footprint, then becomes round again as it exits. Therefore, 10,000 miles of exploring back roads at 40 mph will wear tires less than 10,000 miles of 85-mph Atlanta rush-hour commuting.