Originally Posted by
operator
I just wanted to correct you on the 7710 - that unit is not the same as the 7700, which does require periodic frequent maintenance (essentially a looseball octalink bb) The 7710 unit is like any other standard shimano cartridge (e.g square taper or the 105 octalink), there is nothing to service and it is much better for road use.
This is the 7710 unit.
And the 7700.
Good info and thanks for the correction. BTW, wasn't the triple version of the "Dura Ace" (7703?) Octalink also a sealed unit and only the double was the loose ball type?
I have personal experience with both the 6500 and 5500-series Octalink but only "book learning" about the Dura Ace ones.