- Garmin’s route planner predicted a 22.17 mile ride.
- Strava reports a ride distance of 22.4 miles.
- The Garmin Edge reports 20.48 miles, nearly 10% down!
The plot above shows the recorded speed versus time according to Strava. The plot on Garmin Connect looks a lot smoother. I didn’t notice the speed reading flickering this time. I sometimes notice it dropping then recovering when I ride, but there is evidence that the display on the Edge shows a slightly smoothed speed reading.
So is it a steady error that Strava is correcting by inserting periodic large corrections, or does the recorded speed and therefore distance on the Garmin contain these drop-outs? I am using the speed/cadence sensor.
The mobile phone was connected and it’s following a course. Is there chance the Garmin could be dropping interrupts?
The wheel size is calibrated automatically. Could there be a large error for some reason? Could change in tyre pressure do it?