What do Rotor Cranks do? Rotor Cranks work by slightly increasing the force required on the drive side crankarm during the pedal downstroke, using this energy to propel the non-drive crank are past the 12 o'clock point ... also known as the dead spot. This happens 180 times a minute in a 90RPM ride. Or 10,800 times an hour. This might sound as if we're just transferring energy from one leg to the other, to no gain. But that conclusion is wrong: by throwing the leg in the last 50 degrees of the revolution over the dead spot, you enable that leg to apply more power earlier, leading to a net gain in power output. With ROTOR Cranks, the cyclist can"permanently push" the cranks, as there need be no gap between when the legs take over push/recover duties, otherwise known as the dead spot. All the same, this doesnt eliminate the "rest time" for your legs, because you dont put any force into the pedal stroke in the last section of the upward stroke, and the imporved ergonomics of Rotor System Cranks lead to a reduced production of lactates in the stroke, making the "rest zone" less to un-necessary . This elimination of the dead spot allows the rider to produce more wattage and improve his/her lactate threshold. The extra wattage is converted to speed in the amount of 2-3 minutes per 40k. This is the difference between being 1st on the podium, and not even being on the podium in many races. The difference is even greater when going uphill and accelerating. This is beacuse the power required to overcome wind resistance increases to the third power of rolling resistance as speed increases. In practice, this means that the increased power generated by ROTOR cranks will have a much more notaceable effect when the riders wind speed is lower. As a consequence you will also see significant increses in your climbing speed and a big improvement in sprints from standstill (like when starting at a race, or accelerating from an intersection) once you have switched to Rotor Cranks.
