Originally Posted by
Chombi1
There's no "standard amount of movement or force used on friction shifters. It all depends on how quickly your derailleur can shift.
And the barrel diameter on the shift lever. E.g. Simplex retrofriction levers have a smaller diameter than SunTour "Power" shifters, and require more lever travel than the SunTour levers regardless of the derailleur at the other end of the cable.