Estimate steady-state cycling power from rider weight, bike/gear weight, speed, grade, and wind.
Inputs are imperial units. Positive wind is a headwind. Negative wind is a tailwind.
Positive = headwind, negative = tailwind.
Used to select aerodynamic drag area (CdA).
Used to select rolling resistance coefficient (Crr).
Sea level default, with optional lower-density alternatives.
Represents drivetrain losses between pedals and wheel.