Elevation: Refers to elevation above sea level at point in time of the calculation
(not total elevation gain of a climb). A higher elevation will result in a lower air density
requiring less watts for a given speed.
Wind: Enter a positive wind value for headwind and a negative value for tailwind.
Riding Position: Hoods position is also known as "relaxed hoods", where arms are
slightly bent (ie, not "aero hoods"). CdA estimated values:1 tops:
0.408 hoods: 0.324 drops: 0.307 aerobars: 0.2914
Wheelset: Aero wheelset option reduces CdA value by 3%, super aero wheelset reduces
CdA by 5%.2
High-performance Cycling, Asker E. Jeukendrup (2002)
Tire: Coefficient of rolling resistance (Crr) values are based on 100psi tire
pressure for road, 36psi for gravel. All values are assuming a paved road surface. Using the
advanced mode you can enter a specific Crr value.
Crr values by tire:1
Continental Grand Prix 5000: 0.00321 Continental Gatorskin: 0.00606 Specialized Pathfinder Pro2 Bliss: 0.00722 Vittoria Terreno Dry G+ 2.0: 0.00809