CdA is a scientific measurement that combines a cyclist’s size with their aerodynamic shape. The C stands for the drag coefficient, and the A stands for the frontal area. In simple terms, it measures how much wind resistance a rider and bike create.
A lower CdA number means you are more streamlined and can go faster. Cyclists reduce this number by wearing tight clothing or using specialized aero equipment. Tucking your body into a small, narrow shape also significantly lowers your total CdA.
Professional racers spend time in wind tunnels to find the most efficient possible position. Even small changes, like lowering your head, can make a measurable difference in speed.
For example, a time trial racer uses a specialized bike and helmet to achieve a very low CdA. This allows them to maintain a higher speed while using the same amount of leg power. It is the ultimate metric for understanding your efficiency against the wind.
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