There are always alternatives to the UN55. I used one that was purchased from Chain Reaction (before the Shimano National embargo) until the frame snapped on the bike in which it was installed. I like the fact they have metal cups both sides but it seems many others do too. I'd try Tange or FSA in the future if need be, or a BB which allows for swappable sealed cartridge bearings. The bike I ride still has the original adjustable cups.