Originally Posted by Metricoclock

I think the key phrase people were talking about as a phenomena on why fixed bikes will help pull you through the dead spots of the stroke and not loose effeicency is the fact that..

the rear wheel is acting like a free-wheel in an engine of a car. A spinning mass helping keep the engine or in this case the pedal stroke continuous and smooth.

With a non fixed bike, all the rotational mass and energy is lost.