Garmin Edge 500 erratic speed.

LOCKER Posts: 17
edited April 2011 in Road buying advice

This is my first post and I hope someone can help me.I bought a Garmin Edge 500 + HR and cadence and so far I am quite impressed except that from time to time the speed is a bit erratic i.e under constant effort on the flat it will drop from 22mph to 12mph and back up again over a few seconds. Due to the nature of the device it should even itself out over the ride but its a bit off putting seeing it flucuate like that. At present I am not using the HR or cadence as I want to get used to it and add a bit at a time.

I have emailed Garmin but so far had no response.
Dry Argon 18 Gallium Pro 2010.
Wet Wilier Evasion


  • amaferanga
    amaferanga Posts: 6,789
    Are you using the GSC-10 for speed or is speed from the GPS? If you are using the GSC-10 for speed then it could be that the wheel magnet isn't close enough to the sensor. If you're not using the GSC-10 then it may just be down to getting a poor GPS signal. When it does fluctuate are you under trees or surrounded by hills or buildings?
    More problems but still living....
    LOCKER Posts: 17
    Thanks for the quick input.

    At present I am only getting the speed from the GPS as I was going to introduce the other bits later. It has happened in tree lined roads but also on open clear roads as well.
    Dry Argon 18 Gallium Pro 2010.
    Wet Wilier Evasion