Chain ring sizes come into play.
One for say a 22-32-44 triple will have a different radius than one for a 28-38-48.
Many come with a couple shims so they can be used on 3 different diameters of seat tubes.
Just doing a quick web search lists-
Shimano Deore FD-M616, 28.6mm. Top-pull
Last edited by Bill Kapaun; 02-14-15 at 08:26 AM.