Originally Posted by
RubeRad
I don't see how the marker in the cup makes an analogy with the pedal, is the marker the pedal spindle, and the cup is the crank??
Yep.
If you look at the right crank, the point of highest pressure in the threads will wander around in a counter-clockwise direction, which will cause the pedal axle to turn in a clockwise direction, screwing itself in.
Originally Posted by
RubeRad
If my pedal seized on the spindle, and I somehow kept pedaling, wouldn't that unscrew the pedals as sure as grabbing the spindle with a wrench and pedaling forwards?
If the pedal hadn't had time to torque itself in, or hadn't been mounted properly to start with - sure.
Originally Posted by
RubeRad
And isn't a proper greased ball-bearing just making that seizure very very very gradual?
No. In this case, a lot of tiny nudges do not equal one big shove.