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Aerodynamics & Power
Explore the relationship between aerodynamic drag (CdA), power and speed.
Enter two known values
Leave the value you want to calculate blank. The result updates automatically below.
Your estimated result
Estimated result
Calculated using your total weight and the settings below.
SettingsCrr 0.004 · Efficiency 0.95 · Air density 1.225 kg/m³
Model settings
Model settings explained
Rolling resistance (Crr)
- 0.002 to 0.003 for indoor wood
- 0.003 to 0.004 for smooth concrete
- 0.004 to 0.005 for asphalt
Weight (kg)
Total system weight, rider plus bike.
Mechanical efficiency
Percentage of power transfer efficiency from the athlete through the bike.
- 0.94 = poorly maintained drive chain or standard road chain
- 0.96 = competitive but not fully optimised
- 0.98 = world class components and quality bearings
Air density (kg/m³)
If you have an air-density meter, use live data. If unknown, assume 1.225 kg/m³.
