Originally Posted by
rekmeyata
They were called grease ports and had a small zertz fitting to which a grease gun with the smaller adapter went on to the fitting. Dustcaps cover the ports.
I have no idea where one could buy a small zertz fitting for a bicycle hub, but I don't think they can be replaced.
I only have one bike with hubs that have the grease ports, I wish all my hubs had those, their easy to maintain.
Originally Posted by
Metacortex
Hmm, not entirely sure that is what it is, these ones are just little screw in plugs. I don't see a hole that would make it a real grease nipple. When I unscrew it, all that appears is a hole into the hub for the grease, no seals.