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  1. #1
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    Wattage on non-smart trainer

    I have a cycleops mag non-smart trainer that I am using with a speed and cadence sensor along with Zwift. I am having a hard time dialing in the resistance knob on the trainer. It is very sensitive. Too loose and I am a pro cyclist and too tight I am a slug (all within about half a turn on the knob). About how many watts should I be putting out to sustain say 20 mph on a flat surface? I weigh about 200 pounds. Thanks!!

  2. #2
    tlg
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    ~216 watts

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    Custom Di2 & Garmin/GoPro mounts 2013 SuperSix EVO Hi-MOD Team * 2004 Klein Aura V

  3. #3
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    Awesome, thanks tlg.

  4. #4
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    Quote Originally Posted by tlg View Post
    ~216 watts

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    Sounds high. Analyticcycling.com shows a much lower number and a lot of people with power meters do the same. More like 170 watts or less.

  5. #5
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    If OP is running a fairly recent Shimano crankset, older series left arm power meters from Stages or 4iiii can often be found for around $250.

  6. #6
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    Quote Originally Posted by Kerry Irons View Post
    Sounds high. Analyticcycling.com shows a much lower number and a lot of people with power meters do the same. More like 170 watts or less.
    I weigh 190lbs and 170 watts would have me doing about 17 or so outdoors with no wind. Of course in Zwift 170 watts might get you 20mph with their very generous model

  7. #7
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    Quote Originally Posted by DaveG View Post
    ... in Zwift 170 watts might get you 20mph with their very generous model
    Wait... there's mph data in Zwift? ;-) Funny how, in the real world, MPH is (seems) so important. But in Zwiftopia, we really only care about watts and w/kg.

  8. #8
    The Slow One.
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    Even not factoring in CdA, 170W seems a bit low. 216W seems a bit more like what I would do on solo rides in Mississippi along the Gulf Coast (flat) to reach 20MPH.

    I second the recommendation to get an actual power meter and not try to fiddle around with tension to get what you "should" be reading. Power is power. You either crank it out or you don't. Feelings don't really factor in here. I played around with the belt tensions on my LeMonds a bit, but that was maximize the power I was actually putting out (reinforce a higher cadence). I use a power meter, so Zwift ignores my speed sensor anyway.

  9. #9
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    Yeah, 216 sounds right to me. I'm 180lbs and I'm not going to do 20mph with less than 200 watts on flats in the drops.
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  10. #10
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    "I second the recommendation to get an actual power meter and not try to fiddle around with tension to get what you "should" be reading. Power is power. You either crank it out or you don't. Feelings don't really factor in here. I played around with the belt tensions on my LeMonds a bit, but that was maximize the power I was actually putting out (reinforce a higher cadence). I use a power meter, so Zwift ignores my speed sensor anyway"

    Thanks for all the input. I will think about the power meter. Bear in mind that you are dealing with a guy who does not throw away an inner tube until it has at least 5 patches on it!

  11. #11
    tlg
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    Quote Originally Posted by sixtystrat View Post
    Thanks for all the input. I will think about the power meter. Bear in mind that you are dealing with a guy who does not throw away an inner tube until it has at least 5 patches on it!
    So? Think of all the money you saved on patches and apply it to a power meter. Just don't throw away your power meter if it gets a scratch on it.

    FWIW, I don't throw away tubes until they can't be patched anymore.
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  12. #12
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    Quote Originally Posted by tlg View Post
    So? Think of all the money you saved on patches and apply it to a power meter. Just don't throw away your power meter if it gets a scratch on it.

    FWIW, I don't throw away tubes until they can't be patched anymore.
    Ha ha

  13. #13
    Cleavage Of The Tetons
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    Quote Originally Posted by tlg View Post

    FWIW, I don't throw away tubes until they can't be patched anymore.
    What are these ‘tubes’ of which you speak?

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