All my bikes use standard bb's - i.e square taper, but since the introduction of sealed cartridge, all three had them. No trouble in years, although I'd always recommend a mid to high range model, and no plastic lock ring thingy's. DA/XTR on the best bike (DA group) ultegra on the ultegra bike and Deore on the mtb. Don't get a cheap bb what ever you do - fit and forget if you get a good 'un.