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Sprint Cadence Errors with Rally RS200 / XC200 (Also Vector 3)

GPLama
over 1 year ago
This is a long outstanding issue I'm having with both Rally RS/XC 200 and Vector 3 power meter pedals. I'm interested to know if anyone else has encountered the same. 
During hard/fast road sprints the cadence drops to 0 (or extremely low) meaning the power also drops to 0 or reports incorrectly. This is repeatable (see links below). 
Both the Vector 3 and Rally pedals are on the latest firmware and are using a single new CR1/3N battery in each pedal so I've ruled out battery seating issues. 
Apologies for way too many examples... but it does highlight the issue across both sets of power pedals: 
1x Acceleration 16 minutes Rally RS200 cadence drop. 
1x Sprint ~2hrs 9mins Vector 3 drop: 
1x Sprint at 5mins Vector 3 drop
2x Sprints 1hr 10mins and 1hr 12mins Vector 3 drop
Given the repeatability of these and that is occurring across both Rally and Vector meters, I assume the accelerometers are disagreeing with my sprint style? 
  • 0 over 1 year ago

    FYI, post was automatically flagged for review because of the number of links. I approved it.Slight smileThumbsup

  • 0 over 1 year ago in reply to seilogramp

    Thanks. Is there any way to remove the duplicate posts? (Feel free to do this if you have the access) 

  • 0 10 months ago

    I have more or less the same problem with the Rally xc100 reporting power and cadence to my fenix 5. the connection is unstable with drops in the power and cadence data. What to do?

  • 0 10 months ago in reply to 6424921

    it is not the same issue as Shane posted originally. where is your F5 during the bike ride? on your wrist, or on the handlebar? which type of battery do you use? ( CR1/3N or two LR44/SR44)

  • 0 10 months ago in reply to Luko79

    I have the F5 on my wrist, heart rate measurement  works flawless. The XC100 has a CR1/3N battery.  I also have a Wahoo Elemnt on the handle bar, this cycle computer measures  the power from the pedal correctly.

    I have tried if switching off the wahoo helps, but there is no difference. The X5 still has many drops in the XC100 measurements.

    Could it be that simple that the F5 antenna isn't sensitive enough despite the short distance , less than one meter?

  • 0 10 months ago in reply to 6424921

    OFC that the HR measurement from HR belt is works "flawless", because that has a so-called "error correction" and if there is a signal dropout , it holds the last known value for long period so it is just HIDING the drop issue... (the powermeters have no such a correction, obviously.) The problem is the weak antenna in the F5, your wrist is decreasing the signal strenght heavily, the watch must be faced inside on your wrist or try to put on the handlebar onto a mount. or try to pair your XC100 via Bluetooth to the F5 (maybe that signal is a bit stronger), disable the ANT+ type , and check again. 

  • 0 10 months ago in reply to Luko79

    hi Luko

    I tried your suggestion an faced the F5 down towards the XC100. To my surprise this resulted in a huge improvement, almost no  drops in the power measurements and the few drop were very short.

    I've have had this issue up at garmin-support for months , but there is little help from their side though they must be aware of the issue.

    I'll try BT as well, you never know.

    Thanks so far for your help.

  • 0 8 months ago in reply to 6424921

    Face the Fenix 5 down towards the XC100 worked for me as well. Before massive drop outs. Afterwards no drop out anymore.

  • 0 8 months ago in reply to aletsche

    Facing it down towards the XC100 pedal improves a lot, but still there are occasionally drop outs. It's due to the bad antenna in the Fenix5. May be the Fenix 6 & 7 are improved on this point . I don't know .