Originally Posted by wrk101

Just based on my unscientific experience. In buying and selling several hundred used bikes, out of the bikes I have acquired with spindle and cup bb, 5% or less are worn out. Meanwhile, when I find a bike with a cartridge bb, 75% or more are shot. Most of the ones I find are Shimano UN-xx square taper. No Campy cartridge bbs, an occasional Octalink.