Originally Posted by
rootboy
Fixed cup is on the left of the bike, therefore, would "loosen" when driven with the left crank if threaded right hand. I think this is overblown though. The cranks are driving the spindle. The cups are isolated from the spindle by ball bearings. Mine has never loosened.
The fixed cup is on the right side. You're right, the spindle doesn't touch the cup. The balls do and they are going the opposite direction, which tends to loosen the fixed cup. The problem is real and not overblown.