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  1. #1
    Formerly of Kent
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    Stages took a hit, now won't calibrate "properly".

    As the topic alludes, I had a bit of an off on my bike recently. My Stages Hollowgram, which used to calibrate between the low 860s and the low 870s, is now calibrating in the mid-880s.

    As a result, I *believe* that it is reporting artificially low wattage when I ride. To test this, I took my SRM off my hardtail and put it on my ASRc. Then, I calibrated it, and rode on the trainer. The Stages crank was showing 10-15w lower than the SRM. Prior to this, they were relatively close in the values reported.

    Anyone have experience with this? Any way to fix this at home without sending it back to Stages?

    Thanks!
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  2. #2
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    Was the bike experiencing different changes in temperature?

    I'm impressed you were able to pinpoint a 10-15 watts difference.

  3. #3
    Formerly of Kent
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    No. The bike was on the rollers. In my garage, doors closed.

    And, they were both mounted on the bike at the same time. Stages on left arm, SRM on right.

    Stages app on my phone, SRM was connected to my 520.

    Sent from my XT1585 using Tapatalk
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  4. #4
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    Any idea why the calibration changed ? any wet riding/cleaning happening ? If so, for me, opening the door and leaving the Stages in the house for 12-24 hours fixed it.

  5. #5
    Formerly of Kent
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    Quote Originally Posted by wheelzqc View Post
    Any idea why the calibration changed ? any wet riding/cleaning happening ? If so, for me, opening the door and leaving the Stages in the house for 12-24 hours fixed it.
    Had a relatively minor crash. The NDS side of the bike made contact with the ground. Mostly just the crank/pedal. I was able to get a foot out and didn't really touch the ground other than my left hand and foot.
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  6. #6
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    The stages PM works by having the strain gauges measuring the crank deflection over the glued patch, I doubt the strain gauges had sustain any damage because of the crash, however the glued adhesion may have suffered?

    Either way, the nominal calibration value is 890 with a deviation of +-50 so you are well within limits, whatever might have happened the calibration is making up for it, I'm not sure there is anything to be done by you other than just using it as it is.

    As a side note, I'm still skeptical on running the stages PM on a mtb bike, I'm not sure if its my lack of skill compared to others who have mentioned its very hard to hit the stages PM, but I continually hit my cranks and chainrings on rocks, I'm surprised they are actually in good shape, that is what has hold me off on using a stages on a mtb bike, the fear of trashing 500 bucks on the first ride.


    Edit: I would recommend submitting a ticket on the stages website, see what they say about it, here is the link: https://support.stagescycling.com/en...rt/tickets/new

  7. #7
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    Quote Originally Posted by TDLover View Post
    As a side note, I'm still skeptical on running the stages PM on a mtb bike, I'm not sure if its my lack of skill compared to others who have mentioned its very hard to hit the stages PM, but I continually hit my cranks and chainrings on rocks, I'm surprised they are actually in good shape, that is what has hold me off on using a stages on a mtb bike, the fear of trashing 500 bucks on the first ride.
    I am concerned about this too and that keeps me from getting a Stages unit on my MTB. The one on my road bike freaked out once and wouldn't calibrate correctly for about a week, then just went back to normal. This was during a stretch of particular wet weather.

    What power meter to you use on your MTB then, if any?

  8. #8
    Formerly of Kent
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    FWIW, I'd had my Stages on there for 2+ years. Worked flawlessly during that time, to include some pretty spectacular yard sales.
    Death from Below.

  9. #9
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    Sorry to hear about the calibration issue. On it's face, I wouldn't suspect a zero-offset change of that magnitude would have that much of an impact on the power reading. Stages notes that the expected range of values is within +/- 50 from 890 - so according to them, you are still well within the range (even closer in fact). Some power meters can be re-calibrated from home...I'm not certain Stages is one of them.
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  10. #10
    LMN
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    My experience is that Stages just about always read 10 to 15 watts less then and SRM or just about any power meter.

    Have you compared the two before?
    "The best pace is suicide pace, and today is a good day to die." Steve Prefontaine

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