Not sure what exactly the question is, but 17mm is between 5/8" and 3/4". mm refers to millimeters, which is a metric measurement. The discrepency was created when my 2 lower legs were broken 7 places below the knee between the 2 sides, as a result of being hit by a car. No pins or plates were placed, as I was 13 at the time and they figured that everything would heal up just fine after they were reset. Guess not so fine, but this is what I have to work with!

I am committed to do a cross country tour next year, and when my back and neck are out of alignment, I'm out until I get to the chiropractor. That is not going to be easily done on the road, so I prefer to stay aligned. My other choice is to use my street shoes instead of clip-less.