Was having an idle google about and came across this:
http://www.polaris.net/palmk/crankset.html
I did my calculation, and it returned 171.72mm which seems on the face of it to make sense. Have a bash an post your results......
http://www.polaris.net/palmk/crankset.html
I did my calculation, and it returned 171.72mm which seems on the face of it to make sense. Have a bash an post your results......