Susan - thanks for the link for it answered my question. It does not really matter which direction the tread goes.

Melalvai - I don't know about the overlapping scales. All I know is I got nearly 10,000 miles out of the last set of Select K's I had on my bike so I figured I would stick with a good thing. I think I had one or two flats during those 10,000 so I think the kevlar did its job.