mph

170

watts

2.5

w/kg

mph

170

watts

2.5

w/kg

0 watts

%

lbs

lbs

*Grade*: Enter a positive value for uphill, negative value for downhill.*Rider Weight*: Weight when wearing full a kit including shoes.*Bike Weight*: Include all mounts, saddle bags, etc.

- g = gravitational acceleration (standard value
of 9.80665 m/s
^{2}) - slope = gradient (%)
- M = weight of the rider (kg)
- m = weight the bike (kg)

141 watts

mph

ft

*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}

^{1}High-performance Cycling, Asker E. Jeukendrup (2002)^{2}Cyclist.co.uk

- Cd = drag coefficient
- A = frontal area
- ρ = air density
- v = speed (meters per second)
- w = wind speed (meters per second)

22 watts

*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

- g = gravitational acceleration (standard value
of 9.80665 m/s
^{2}) - slope = gradient (%)
- M = weight of the rider (kg)
- m = weight the bike (kg)
- Crr = coefficient of rolling resitance

7 watts

*Chain*: 3% power loss for well lubricated chain, 4% loss for poorly lubricated chain.^{1}*Derailleur Pulleys*: 2% power loss for steel bushings, 1.5% for steel bearings, 1% for ceramic bearings, 0.5% for ceramic bearings with oversized cogs.^{2}*Pedals and Bottom Bracket*: There is power loss from bearings in the bottom bracket and pedals but in most cases it is less than 0.3% so we have omitted from our model.

^{1}Ridefar.com^{2}Ridefar.com

- loss = percentage loss in power from drivetrain