Calculating Power

Discussion in 'Power Training' started by CapeRoadster, Dec 5, 2006.

  1. CapeRoadster

    CapeRoadster New Member

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    If I know my speed and cadence, can't I calculate power without a power meter?

    Why would I want to buy one when I could spend a grand on a nice cycling vacation somewhere?
     
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  2. rmur17

    rmur17 New Member

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    nice one ...
     
  3. jws

    jws New Member

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    Cadence has no significance, but you can calculate power pretty easily if you:

    1) know total weight
    2) know or calculate speed
    3) estimate friction and rolling resistance(not too hard)
    4) know grade
    5) do the test on a steep, steady grade so that speed is low; or, alternatively, know your CdA(aerodynamics) and ambient air conditions very precisely(pretty tough).
     
  4. SolarEnergy

    SolarEnergy New Member

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    Well (and I'm not being sarcastic here), if you're not to concerned with your improvement... I mean I have a lot of friends who just ride for the sake of riding, with no goals other than piling as many miles as they can in a season. Which is perfect if it's what you want.

    In such a case then choose the vacation.
     
  5. Eden

    Eden New Member

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    with some of the info above you can use this http://www.kreuzotter.de/english/espeed.htm calculator to get a power estimate.

    this is also kind of fun to use to find out how losing weight or making other changes can change your ride times.
     
  6. rayhuang

    rayhuang New Member

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    I was bored last night and did just that. Figured out my power to weight ratio now, if I were 10 lbs lighter and how much power I would need to produce to be at a Cat2 level. Fun, humbling and a great source of motivation!!!
     
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