Originally Posted by
bcody
I have an old Shimano rear derailleur, a stag head long cage model (see picture). The pulleys are both 10T but they need to be replaced. Would new Shimano 11T pulleys work as replacements? It seems like the only things that matter are the width and diameter of the pulleys. What do you think?
It will be used with a triple in front and an 11-34 9 speed in rear.

I've got the same DER on my 86 RockHopper. I don't know if it's original or not.
IF the 11T fit, post back. Mine are getting a little sloppy too.