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Thread: Hrm fwiw

  1. #1
    PMK
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    Hrm fwiw

    We are an average team having fun. One issue we have struggled with on all our tandems, but more so on the road is monitoring stoker effort. I appreciate her amount of power, but some times we need less peak output and more constant power delivery.

    We have tried a bunch of different HRMs in an effort to put the stokers HR in front of the captain so I could better see how shes doing and make better gear choices or read through her "I'm ok we don't need to stop" as we pass by a 7-11 or cool spot along the ocean.

    Jeanne hurt her knee recently and is healing well (no evil comments TG, special tape is done for now). Our friend that is a former Australian National Triathlon champ and one of the girls helping with her PT mandated we start actually monitoring cadence. My non exact was not good enough, but turned out pretty close.

    We got a Sigma ROX 9.0, primarily for cadence, as luck would have it, the stoker HR can be detected on the main unit mounted on the captains stem.

    With several rides now done with the ROX 9.0, it is proving well worth the money as it lets the effort needed and output keep things well under control.

    The downside of the unit, and a screen I may disable is the ambient temp. Headed South along A1A, into a 25 mph headwind, for over thirty miles was showing over 103f. Pretty discouraging info. I don't need to select it, but was curious.

    Also, the altitude function on the ROX 9.0 does work, but is barometric based and obviously varies constantly as the day changes, so don't count on that function as accurate. Percent of grade may also be barometric, so it's accuracy may not be that accurate either. It reads 0 along the ocean.

    Just a FWIW topic. So far so good with all (3) of our various Sigma HRMs.

    PK
    Last edited by PMK; 03-27-11 at 04:45 PM.
    2006 Co-Motion Roadster, flat bars, discs and carbon fibre fork, size 22 / 19
    2006 Ventana ECDM full suspension mountain tandem
    Some single bikes and a couple of KTM's
    And most important, someone special that enjoys them with me (except the KTM's)

  2. #2
    just another gosling Carbonfiberboy's Avatar
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    Do you also monitor and compare captain's HR? And if so, do you try to match zones with her, and if so, how?

  3. #3
    PMK
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    Quote Originally Posted by Carbonfiberboy View Post
    Do you also monitor and compare captain's HR? And if so, do you try to match zones with her, and if so, how?
    Yes, captain also has a HRM. Yes they are compared.

    As for matching zones, yes and no. To run at 100%, I can run a bunch of BPM more than she, mainly on account of her asthma. My recovery time is much faster. My resting HR, and "idling" HR is lower.

    From past riding experience where she had a HRM, and I had mine (each calling out BPM when asked), we found certain conditions that offered decent speed, estimated cadence, and HRM stats. So do we match them for zones? On the flats it's very close if not matched. Climbing hers will climb quickly but is breathing limited.

    Previously without cadence there was more guess work. Now with everything grouped together, it seems easier to watch speed vs cadence vs HR. In summary, it's now easy to see high rpm / light loads bring HR down plus watch for a speed decrease or feel the bike bouncing. Same for a low rpm / high load speed decrease. So I think to answer your question, it's a function of watching speed, then finding a good cadence to keep the HR lower. There are times when we just don't want to turn 100 or more so at times we mash a bit.

    It also is now more obvious where we want to be when pushing or backing off to unwind after a big effort. Stoker no longer has to be concerned with the numbers. This so far has made the workload easier, and keeps her from pushing too much.

    Bottom line is, I wish it were easier to come up with perfect numbers, but we're having fun.

    I did not intend for this to be a review though it is sort of. Mainly letting others that have possibly looked for a HRM that will transmit to the captains location know this is working for us. Our science of what works to make the bike go will likely be a lot different than others.

    PK
    2006 Co-Motion Roadster, flat bars, discs and carbon fibre fork, size 22 / 19
    2006 Ventana ECDM full suspension mountain tandem
    Some single bikes and a couple of KTM's
    And most important, someone special that enjoys them with me (except the KTM's)

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