Polar power sys – inaccuracies due to the BIG DIFFERENCES IN RINGS HEIGHTS

Discussion in 'Power Training' started by VS1, Feb 4, 2006.

  1. VS1

    VS1 New Member

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    Hi,

    Do you think that installing POLAR power system on a Cross-bike with 50-34T Crank will cause a problem due to the big differences in rings heights ?

    (it’s a 50-34T with an 11-34 XT casstte..)

    I am asking as it is said (I also experienced it on a dura ace 53-39T) that the Polar power system losses its accuracy when the chain gets far from the power unit.

    Thanks !
     
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  2. mises

    mises New Member

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    YES, it will cause problems if you follow the standard mounting directions. With a 50/34,11-25 I got it to work fine but had to set the sensor height so it almost rubbed in the 34x12 when the chain was under tension. With an 11-34 cassette you will probably need to have it almost rub when on the small ring and the 3rd smallest cog on the cassette to get consistent readings.
     
  3. JTE83

    JTE83 Member

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    I run a 12 - 27 cassette and the power readings go bad on cogs 21 and over.

    53 x 39 front
     
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