Originally Posted by
dabac
But for the sufficiently stubborn it is possible to build a quad crank...
For the full
Rube Goldberg, one could combine a two-speed kick-back hub (Sachs or Bendix) with a Schlumpf Speed Drive crank/bottom bracket, yielding four gears of, say, 40, 54, 66 and 90 inches, with just the single chainwheel and sprocket and without any visible shift mechanisms.
Best,
tcs