The following equations include any of the relevant drag components: rolling resistance, air drag (including wind speed), mechanical losses, and uphill or downhill power.

P 
Rider's power 
V 
Velocity of the bicycle 
W 
Wind speed 
T 
Air temperature (reduced to deg. Kelvin) (influences air density) 
HNN 
Height above sea level (influences air density) 
rho 
Air density 
rho_0 
Air density on sea level at 0° Celsius (32°F) 
P_0 
Air pressure on sea level at 0° Celsius (32°F) 
m 
Mass of the bicycle (influences rolling friction, slopedependent pulldown force, and normal force) 
M 
Mass of the rider (influences rolling friction, pulldown force, and the rider's frontal area via body volume) 
A 
Total frontal area (bicycle + rider) 
Cw 
Air resistance coefficient 
g 
Gravitational acceleration 
Cr 
Rolling resistance coefficient 
Cm 
Coefficient for transmission losses and losses caused by tire slippage (the latter can be heard during powerful pedal strokes at low speeds, for instance by their echo when you're riding along a vertical wall)

stg 
Inclination (grade) of road (unit: percent) 