2009 SRM - Power Data Lower than Power Tap

Discussion in 'Power Training' started by onebadjd, Feb 8, 2009.

  1. onebadjd

    onebadjd New Member

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    I have been training with Power Tap and Ergomo power meters for the past few years. The power of each meter was consistent. I recently decided to upgrade and purchased an FSA SRM with a power control VI. My power output with the SRM is consistently 12-18% lower than what is shown on my power tap and what a similar ride would have produced using an erogomo. While training today a friend had an SRM with a p.c. V. As we rode along the flats, I noticed his display significantly higher than mine so we switched bikes. I understand that a persons weight etc. will have an impact on the power numbers, but once I got on his bike and he on mine, my numbers were higher. I have double checked to make sure the proper slope is inputed. Has anyone else experienced this problem? If so what causes it and what is the fix. Thanx.
     
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  2. Alex Simmons

    Alex Simmons Member

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    Perform a calibration check on the SRM slope.
    Often factory slopes are wrong. Not usually by that much though.

    Check the SRM zero offset is set properly before riding.
     
  3. onebadjd

    onebadjd New Member

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    Thanx Alex, I zero offset before each ride. I am not sure how to perfrom a calibration check. I downloaded the manual from SRM so I'll check on how to perform the calibration.
     
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