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Edge705 + powertap = wrong speed calculation.. Help!
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Edge705 + powertap = wrong speed calculation.. Help!
Postby gogo419 » Wed Mar 13, 2013 1:38 pm
I did a total reset and calibrate on the garmin, powertap and cadence/wheel sensor last night and had it all working. However after 1km of riding this morning. An alert pops up saying auto wheel size calibrate complete and the current speed showing on the garmin dropped by 10kmh to what it was doing before.. If I turn power ant+ off during the ride then the speed goes back to what it should be showing..
Anyone had the same problem of got any tips??
If I haven't explained this well enough? Let me know? C
Gogo
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby twizzle » Wed Mar 13, 2013 1:57 pm
...real cyclists don't have squeaky chains...
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby Summernight » Wed Mar 13, 2013 2:05 pm
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby twizzle » Wed Mar 13, 2013 2:16 pm
I did a total reset and calibrate on the garmin, powertap and cadence/wheel sensor
And, does this mean you have a speed/cadence sensor in addition to the Powertap which is also putting out a speed & cadence signal?
...real cyclists don't have squeaky chains...
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby gogo419 » Wed Mar 13, 2013 3:00 pm
Summernight wrote:Can you set the wheel size to manual? I have done that for my Edge500 and it seems to work better than when it was automatically calculating the size.
Yes! I think that could be the problem. I know it is on auto.. So i will change it back to custom and change the size back to 2100mm and then it should all hopefully work..
Although originally the wheel size was set to custom before i got the powertap so not sure how it magically changed..

Thanks to the other guys for replies as well! Yes i have a speed sensor as well as the powertap.. This was put on last week thinking it might help solve the problem.. Originally i thought the GPS sensor must be stuffed before i realized it was isolated to only using the power tap.
cheers gogo
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby Summernight » Wed Mar 13, 2013 5:24 pm
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby Robthommo » Thu Mar 21, 2013 6:34 am
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby Robthommo » Thu Mar 21, 2013 6:34 am
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby twizzle » Thu Mar 21, 2013 1:09 pm
A GSC10 that didn't nuke itself after 12 - 18 months!
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Re: Edge705 + powertap = wrong speed calculation.. Help!
Postby nickobec » Thu Mar 21, 2013 7:05 pm
My favourite Garmin issue, rode single speed with GSC10. 1st half of journey 15km in 30 minutes, 75rpm at average of 15kph, adjustedposition of speed magnet, next 15km in 30 minutes 75rpm at 60kph , estimated 1800w average. Strava does not show my best power figures anymore.
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