This is an interchangeability requirement for parts production. To facilitate production, the left and right foot pedals and left and right foot pedal levers are exactly the same, either left-hand or right-handed, so during assembly, any pedals and foot levers can be assembled to the left and right sides, simplifying the process. Production and assembly.
Some people will say, wouldn’t one side become looser and looser? In fact, when pedaling, the friction torque of the pedal bearing is very small, and the thread is self-locking due to the large pressure between the internal and external threads caused by the bending moment of pedaling, so it will not loosen no matter how hard you pedal.
Will the pedals actually become loose? This will happen! That is, the bearings inside some old and broken bicycle pedals have become rusty and stuck. They cannot rotate and make a squeaking sound. In this case, the pedal threads will squirm and may become loose.
So cyclists, rest assured, you don’t have to worry about this problem.