I think it was Tom Dalton who remarked that Campy crank bolts also came in
14mm size, too. I have found vintage bikes with 14mm on the non-drive side
and 15mm on the drive side. I really can't imagine why, but I have.
Possibly to keep constant the rule that if I get a pocket full of tools out
of one of my boxes instead of carrying the box out on the patio or to
wherever the bike is, I'll invariably have the wrong tool or need one (or
more) more and have to make at least one additional trip back to the
box...sort of a Murphy's law, I guess.
Now here is a question for the cognoscenti...Did Campy make anything but a
15mm peanut butter wrench?