Garmin 800 faster than strava

boogi11
boogi11 Posts: 354
edited October 2012 in Road general
Hi all
Took my garmin 800 for a spin today and it had me 1.5 mph quicker than strava, which would you trust ?

Wheel size on garmin is set to auto?

Comments

  • TakeTurns
    TakeTurns Posts: 1,075
    Are you uploading data to Strava from your Garmin? Then surely the data should be the same. I've never had an issue with the data interpretation by Strava. Strava takes the data from your Garmin, it doesn't change it in any way.

    Maybe you're mixing up the average speed between elapsed time (includes resting time) with moving time.
  • boogi11
    boogi11 Posts: 354
    No, I have used strava for lat six months, just got garmin, used both today and they have different speeds
  • I wouldn't trust either. :lol:
  • TakeTurns
    TakeTurns Posts: 1,075
    edited October 2012
    Could just be a technical error. I wouldn't worry about it unless it happens again. Unless it costed you from gaining a KOM, then you should take out a law suit against Strava.
  • Buckie2k5
    Buckie2k5 Posts: 600
    so the garmin is quicker, i knew strava on my mobile was slowing me down ;)
  • adr82
    adr82 Posts: 4,002
    Strava takes the original Garmin data and recalculates parts of it. The most obvious sign of this is the difference in "moving average" speeds you see between Garmin Connect and Strava - on a ride in/out of Glasgow where I hit a lot of lights I often see a 0.5-1.0mph drop in speed in the Strava data compared to the Garmin data. If I'm riding out in the country and barely have to stop during the entire ride, the two speeds tend to agree much more closely. So whatever Strava is doing, it clearly counts me as "stopped" for less time than Garmin Connect does.

    Edit: to show I'm not making this up, see here: https://strava.zendesk.com/entries/2127 ... calculated : "Strava proceses and analyzes the data in the file independently, whereas the Garmin tabulates these values on the device itself."
  • dabber
    dabber Posts: 1,926
    Strava calculate stopped as follows:

    Strava considers a point "not moving" if your speed is less than 0.3 meters/sec (0.67 mph), but we don't start accumulating resting time unless you're "not moving" for at least 15 seconds
    “You may think that; I couldn’t possibly comment!”

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  • adr82
    adr82 Posts: 4,002
    Dabber wrote:
    Strava calculate stopped as follows:

    Strava considers a point "not moving" if your speed is less than 0.3 meters/sec (0.67 mph), but we don't start accumulating resting time unless you're "not moving" for at least 15 seconds
    I don't understand why they have to use 15 seconds as their "not moving" threshold, that's way too conservative! Makes it clear why the differences in time/speed appear though.
  • I find that top speeds are usually different between my 800 and Strava, usually Strava has it a bit less than the 800, and less often a bit more.