Originally Posted by
aclinjury
when it comes to bottom bracket drag, the biggest drag is due to the (micro) misalighment of the two holes of the bb shell. This misalighment is due to the loose tolerance of the bicycle industry.
Yup. The bike industry will sell you an insanely overpriced bearing with (claimed) unnecessarily high tolerances for you to run in a sloppy housing that was manufactured the absolute cheapest way possible. The ultra-precise bearing is promptly destroyed in a small fraction of its designed life by a misalignment. Rinse and repeat.