vcballbat
Senior Retro Guru
The Simplex Retrofriction shifters have an internal spring which is under tension when the shift lever is fully forward and not under load. When pulling back to load the lever the spring releases tension to lighten the shift. The operation is smooth with no ratcheting or clicking and the effort required to up and down shift is similar because of the assistance of the loaded spring. I would say that shifters similar in action and operation to Simplex Retrofriction shifters could be described or labelled as 'Light Action' Shifters... hope this makes sense..☺