Originally Posted by TejanoTrackie

The problem is that the stock Sugino 75 BB is not sealed, since its intended use is on the velodrome, which is clean and dry. Yes, the loose ball BB is a bit smoother when properly adjusted, but it is hardly noticeable in normal use on the road. If you only ride in dry weather, and there is not a lot of dirt and sand on your roads, then it probably won't matter, but for non-competitive use I prefer the convenience of maintenance free bearings.