Originally Posted by
fietsbob
Mk3 they went to Sachs, there the 3 by 2 used a thinner 2mm cog, 13t , and a 15t that skipped 3 teeth as shift gates..
did not change the 3 spline interface, just made it wider.. to fit 2..
They did not make anything wider. I had the same upgrade on a Sachs-3-speed back in the 80ies and is was an official upgrade for retrofit from Sachs at that time. You can do this with any Sachs 3-speed-hub, possibly since the 70ies.