What factors influence the total aerodynamic resistance in wheelchair racing?

The reduction of the frontal surface, the orientation of the body segments, and the use of tight clothing influence the total aerodynamic resistance.
Internal friction losses between wheelchair components, such as wheel axles, are negligible if well lubricated.
Losses of energy can occur during the application of forces in the push phase of propulsion if the frame structure is not sufficiently rigid.
The weight of the athlete-wheelchair assembly has little influence on rolling resistance, but is a very important factor when climbing hills or accelerating rapidly.