My Sbike's UN-10 BB is finally giving up the ghost (TBH I didn't expect it to last this long) and due to the switch to M730 and different BB length requirements, my Scott needs a new BB as well.
For the Sbike I was able to source a pair of NOS UN-72 BBs in the correct 68-113 fashion, so that's sorted and I should be good for another decade or so.
However the Scott is doing my head in. No UN-72s to be found in 68-122.5, but I did find a UN-55 and a NOS XT M730 BB in the correct size and thread type.
The bike would normally have a 1994 Alivio set instead of the M730-735 it's wearing now, so originality is not an issue. Reliability is, especially because I tend to break UN-45 and UN-50 BBs very quickly.
So which one would be most likely to be stronger and more reliable?
Also, I'm totally unfamiliar with those old BBs. Is it easy to set up, adjust and maintain? Not planning to put the bike in the workstand every week to re-grease the bearings and adjust the tension. OR