Chain Sprockets are effectively regular polygons. Because of this, when the small sprocket is pulling the chain a pulse is created in the system.
It is important not to choose a sprocket too small for the smoothest power transfer.
(pitch /(2*TAN(PI()/ teeth ))) / (pitch /(2*SIN(PI()/ teeth )))
![Cog-Variance-from-round.gif](/wiki/images/7/7a/Cog-Variance-from-round.gif)