Confusion on JackShaft kits

Two different sizes of pedal threading. When you buy a shifter kit, ( that's what you're calling a jackshaft..) it comes with new crank arms that thread into the freewheel and if your bike's old crankset is a one-piece crank, it has 1/2" threaded pedals, the shift kit takes 9/16" threaded pedals. You will then have to also buy a new converter BB for your bike to use a shift kit.
 
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