The Co-op that I volunteer at had a 8 1/2 by 11 sheet of paper that had all of the various BCD's outlined. It was set up so you could just hold a crank or chain ring up to it and it would show you what BCD it was. It has grown legs and left the shop and we really miss it. Does anyone have an eletronic copy that they could post or email me?
Chris "at" sacbikekitchen "dot" org