Originally Posted by
RubeRad
So I just got a UN300 122.5 because a UN55 115 I had laying around wasn't right for the chainline of a build.
The NDS cup doesn't have a lip to provide definitive feedback on when to stop inserting, by clamping up against the frame. Instead it looks like it could screw in endlessly. Is there any better way to know when to stop screwing it in, other than when it stops screwing in?
A steel shell with that big threaded interface can take a
ton of torque. And the cartridge, being designed to withstand craptons of cycles of pedaling forces, is also perfectly happy to be pushed on pretty hard by the cups. So go ahead and torque the crap out of it.
Shimano spec is 50-70nm.
No, that's not a joke.
Shimano spec is actually 50-70nm (see page 17).
Anyway, the lack of a flange adds versatility to the BB. For instance, if you put a spacer on the drive side to set the spindle up asymmetrically, there's no flange stopping the NDS cup from inserting far enough to adequately grab onto the cartridge.