Well, a set o Koyo bearings cost 8-10 Euros and will easily give you 10.000km. With
that money you only buy junk BBs like the UN-26 (had three, lasted 200, 280, 320km).
I would have to spend 20 Euros (twice as much for the Koyos) to get better stuff like
the UN-55 but we (co-bikers) have had big mileage variations from it.
And of course the fact that in the end, a set of bearings is less garbage than a sealed
bottom bracket (axle, bearings, cups, cover). Anyway, we use whatever fits us best
so there is no point in all this sealed vs whatever thing
