What's the difference between un91 and un73?

I knew someone would come back with that, which why I put in the "I ride a lot" caveat. It's been like that since I've been riding, never had much more than a year out of one. This latest UN73 has surprised even myself, NOS fitted to the bike October and it's totally shot (4 rides per week average 15-20miles off road per ride) perhaps where it's been in store the grease has moved somewhere, dried up to some extent - who knows...

Anyway, back to the topic. Any more info on the UN91?
 
What do you want to know on the un90/91?

Fitted mine in 1992, came out a few years ago as it had a hint of play, still perfectly smooth.

Been through dossing around at nights urban style, paper rounds, big hills, rain, sleet mud, commuting, neglect, not used for a few years Ridden again then not used much and then back out in Retrobike land and retired etc...
Good bottom brackets.
 
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