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speed from power

SPEED FROM POWER

Cycling calculator: speed from power

Use the sliders to adjust the various inputs to calculate the speed sustainable for a given power. 

Not sure what values to use for various input factors? I've included a few thoughts and guidelines on each below the calculator. Of course having your CdA measured at an Aerocoach session would be a great start!

  • Power

    Power at cranks (W)

    300 W
    • 0
    • 50
    • 100
    • 150
    • 200
    • 250
    • 300
    • 350
    • 400
    • 450
    • 500
    • 550
    • 600
  • Speed

    (km/h)

    10203040506070800
  • CdA

    Coefficient of Drag x Frontal Area (m^2)

    0 m^2
    • 0
    • 0.05
    • 0.1
    • 0.15
    • 0.2
    • 0.25
    • 0.3
    • 0.35
    • 0.4
    • 0.45
    • 0.5
    • 0.55
    • 0.6
  • Crr

    Coefficient of rolling resistance (unitless)

    0
    • 0.001
    • 0.002
    • 0.003
    • 0.004
    • 0.005
    • 0.006
    • 0.007
    • 0.008
  • Gradient

    Rise/Run (%)

    0 %
    • -6
    • -5
    • -4
    • -3
    • -2
    • -1
    • 0
    • 1
    • 2
    • 3
    • 4
    • 5
    • 6
    • 7
    • 8
    • 9
    • 10
    • 11
    • 12
    • 13
    • 14
    • 15
  • Rider weight

    (kg)

    70 kg
    • 40
    • 50
    • 60
    • 70
    • 80
    • 90
    • 100
    • 110
    • 120
    • 130
  • Wind speed

    at rider level (km/h) Positive = headwind. Negative = tailwind

    0 km/h
    • -15
    • -10
    • -5
    • -4
    • -3
    • -2
    • -1
    • 0
    • 1
    • 2
    • 3
    • 4
    • 5
    • 10
    • 15
  • Bike weight

    Bike & equipment weight (kg)

    8 kg
    • 4
    • 5
    • 6
    • 7
    • 8
    • 9
    • 10
    • 11
    • 12
    • 13
    • 14
    • 15
    • 16
    • 17
    • 18
    • 19
    • 20
  • Air density

    (kg/m^3)

    1 kg/m^3
    • 0.8
    • 0.8
    • 0.9
    • 1
    • 1.1
    • 1.2
    • 1.3
    • 1.4
    • NaN
    • 1.4
  • Drivetrain efficiency

    Drive train efficiency losses %

    97 %
    • 90
    • 91
    • 92
    • 93
    • 94
    • 95
    • 96
    • 97
    • 98
    • 99
    • 100
  • Seconds per km

    NaN s/km
  • Rider power/weight ratio

    4.29 W/kg
  • Power to CdA ratio

    Infinity W/m^2

CdA and Crr

CdA
(m2)
Examples Crr Examples
0.17 - 0.20 Very aero time trial riders 0.0020 - 0.0026 Indoor wooden track
0.20 - 0.25 Time trial set ups 0.0030 - 0.0040 Smooth concrete track
0.22 - 0.28 Ironman set ups 0.0040 - 0.0045 Good quality bitumen with race tyres
0.25 - 0.30 Road race bike in aero tuck 0.0045 - 0.0060 Rougher bitumen / chip seal
0.30 - 0.40 Road race bike in upright positions

AIR DENSITY

Air density is not always obvious and so that's why we've created this air density calculator to make it easy! 

Drivetrain efficiency

Drivetrain efficiency of well maintained bicycles is typically around 97-98%.

Wind

Wind measurements are obviously tricky as they are affected by various factors including the direction of wind relative to the rider's direction. Wind speed at rider level will typically be around half that reported by the weather bureau/station. This is because standard weather station wind measurements are made at a height of 10m above ground and wind speed reduces closer to the ground boundary layer. Naturally the wind speed and direction at any moment is also impacted by trees, buildings, vehicles and other features.

CYCLELAB 360
Cycle Lab
Via Pilastri 4
05100 Terni
info@cyclelab360.com

Cycle Lab – Area Lab
Via Giorgio Vasari 17
60125 Ancona

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