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crank arm length and Favero Bepro

MACKANG
over 5 years ago

Hi.

Every time I power up my edge 530 and it connects to my Bepro pedals it will change the crank arm length to 180mm for both pedals ore even what you  see in the picture can happen. 180mm left pedal and 208mm for right pedal. I went back from fw3.50 to fw3.20 but the same happens. If I look at the sensor details on the edge it says 172.5, but when I connect the pedals to my desktop and run the bepro program it is chanced to 180mm every time. I have used the pedals with my edge 520 from December 2016 and never had this problem. I can't test it on my 520 any more because of a cracked screen, but if I test with my old edge 500 there is no problem with crank length.

I swore to my self not to by another gramin when I couldn't use my 520 any more, to bad I didn't listen. 

  • 0 over 5 years ago in reply to MACKANG

    Garmin did switch to the latest profile that is how they provided support for Favero.

    Sorry I posted version 5.0 and not 5.1

    Here is version 5.1

    D00001086_ANT+_Device_Profile_-_Bicycle_Power_Rev_5.1.pdf

  • 0 over 5 years ago in reply to aweatherall

    i have the same exact problem.

    and i am very disappointed.

    can we have a solution? garmin should fix that issue

  • 0 over 5 years ago in reply to PaNoSS

    i think that th problem is with garmin edge 530 because user  Mackang said that it was ok with edge 520 or even with 500

  • 0 over 5 years ago in reply to PaNoSS

    The older units like the 500 did not send a crank length to 3rd party power meters.

  • 0 over 5 years ago in reply to aweatherall

    despite that even with edge 500 cannot set that parameter you can via software and value stays!

    why with garmin edge 530 not stays? problem with the communicaion code

  • 0 over 5 years ago in reply to PaNoSS

    Not necessarily. The problem could still be with the receiving end in in terms of what it does with the message.

    I have looked at the message sent by the Edge and it conforms to ANT+ specification for setting the crank length. So from the sending side the problem appears to be with at the receiving side.

    The same message works with PowerTap P1 pedals and the Vector pedals and the Favero ASSIOMA.

    The fact it works with the Assimoma and not the BePro indicates to me that it is a problem with the BePro.

  • 0 over 5 years ago in reply to aweatherall

    Here is some data from a user with a similar issue. They were setting the crank length to 175 mm on an Edge and it was showing as 208 on the pedals.

    The Edge is sending the get/set message for the crank parameters

    2 1 255 255 130 126 0 255

    130 is the crank length which converts to (130 * 0.5) + 110 = 175 mm

    the 126 is the Sensor Status Bit Field  

    126 = 0111 1110
    lsb 10 goes to manually set crank length
    then 11 goes to same SW for both sides
    next 11 corresponds to both left and right sensors being present

    and finally 01 means that a custom calibration isn't required

  • 0 over 5 years ago in reply to aweatherall

    This issue might well be at the Garmin end, but all the radio traffic that I have analyzed always shows the correct length be passed by the Edge.

    The issue appears to be when the two systems first connect even though the Edge shows that it is sending the correct length. If you change the length after it is connected those changes are correctly reflect on the pedals. 

    It appears to be something to do with the handling of that very first message.

  • 0 over 5 years ago in reply to aweatherall

    Are you in contact with favero support team?

    Can we have a permanent solution?

  • 0 over 5 years ago in reply to PaNoSS

    I'm not in contact with Favero.

    I'm willing to work with Favero, but I don't have a set of their pedals to test with. 

    I have passed my findings on to Garmin and I know that they did forward that to Favero.

    From other communications I have seen Favero says it is Garmin issue, while the radio traffic points to at least some of the problem being a BePro issue.

    For the left and right crank lengths to end up with different values has to be a BePro issue (Left 180, right 208). The ANT spec and message only supports passing a single crank length value which is sent to the master pedal. It is then under the control of the pedal manufacture to take that value and pass it on to the slave pedal. The Edge has nothing to do with that pedal to pedal communication and only sees and communicates with the master pedal..