Originally Posted by
Henry III
The UN54 is a cheap dependable unit from Shimano that I've used quite a bit. Though I have no issues with a loose bearing bb setup. Most of the time when I get them though the previous negelated them to the point the races are really pitted and the grease is like tar.
Yeah, the UN54 is a really nice example of the "sweet spot" in bicycle parts, dependable and decent quality, for very little money. Too bad they come with the plastic NDS cup. I'd gladly spend $5 more if Shimano supplied them with an aluminum one.
I like cartridge bearing BBs for the reasons already stated: they're buttery smooth, need no adjustment, and they're sealed. And when they wear out, just toss them. They're cheap enough. And if you're really a tightwad, you can open them up with the right tools, and replace the industry-standard cartridges for about $4. I don't think I'd use one on a vintage build, however, just from an aesthetic perspective. But I have no problems using them on any of my 1980s or newer frankenbikes.