The higher efficiencies in each range are achieved at higher power levels and in direct drive hub gears or with large driven cogs derailleurs. A bicycle in which the rider lies in a supine position is referred to as a recumbent bicycle or, if covered in an aerodynamic fairing to achieve very low air drag, as a streamliner. Racing bicycles are light in weight, allow for free motion of the legs, keep the rider in a comfortably aerodynamic position, and feature high gear ratios and low rolling resistance. Energy output[ edit ] Active humans can produce between 1. The rate of food consumption, i. This input power can be determined by measuring oxygen uptake, or in the long term food consumption, assuming no change of weight.
Generally larger riders will do quite well on the flats as their pure power will outweigh the larger frontal area they have to push through the air. Average Bike Speed Uphill This is where the smaller riders will have an unfair advantage as the secret to climbing uphill is the power to weight ratio. The less you weigh the less power you have to generate to get up the hill within the same amount of time. It is true that the larger riders generally have more muscle mass and can generate more power, but the advantage is the smaller riders. This is why pure climbers generally weigh less.