I may be, I'll look in a dictionary to find the appropriate translation in my language. Fretting as far as I know it's a temperature based tight assembly type with the use of dilatation (exterior diameter is heated to red, the inner part is freeze and assembly is done easly. When they cold/heat up, they realize a strong pressure between the pieces).
Giving you the benefit of the doubt, you're suffering a lost in translation. Read the article on Sheldon's page, sitting still leaned up against the wall isn't the problem. Industrial bearings are not going to differ significantly from a bicycle headset.