Well no, that wouldn't make sense. But think about it, yes there are 17 skid patches over the full rotation of the crank, but if I'm only skidding with my right foot forward... doesn't that eliminate those skid patches I would be using if I had my left foot forward?

This theory is somewhat supported by the fact that only 180 degrees of my tire are showing skid wear. Not saying it's a fact, just hypothesizing...