Originally Posted by
zeppinger
Many reasons. Such as to pack the bicycle for transport on an airplane, train, or bus. To assemble the bike once you reach your destination on an airplane, train, or bus. To put a pedal that has fallen off back on, which is admittedly rare but it happens.
Or if the dang thing is just creaking and you don't want to listen to it click and creak for another 500 miles.