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HELPS!! GARMIN TRACKING VS GOOGLE MAPS

7218397
over 3 years ago

I've recently made a ride with my bike, wich was tracked by Vivo Active 3 and Garmin Speed and Cadence sensor V2. After the ride I've synchronized the smartwatch with the Garmin Connect app and showed the results. My bike has 28inc rims and i've manually upload the diameter trough the smartwach

I had a doubt about the accuracy of the KM made, so I downloaded the KML file and once imported on Google Maps the track is not 56km but 42km. How is that possible?
Attached you can also find the two screens from Garmin Connect and My tracks (Google)

 Garmin Connect

My Tracks Google

 Rims diameter

  • +1 over 3 years ago

    A 28 inch wheel isn't 2800 mm in diameter. That is 2.8 meters! The diameter is something like 680 mm, but that is not interesting here. What you should input is the cirumference of the wheel which would be something like 2136 mm (table value).

    Best is to measure the weighted rolling distance for at least 1 revolution. Mark the wheel and ground. Sit on the bike and bike at least 1 full revolution. More revolutions are better. Mark the ground again. Measure the distance with a tape measure and divide it with the number of revolutions.

  • 0 over 3 years ago in reply to e7andy
    e7andy said:
    What you should input is the cirumference of the wheel which would be something like 2136 mm (table value).

    Agree, 2800 is far to much. I have 2284 for a 29" x 2.3 MTB wheel and tyre. I calibrate by cycling a known (measured) distance, luckilly I have a 1km measurement track by one of the roads nearby used by the road agency to calibrate their equipment.

    The second best option is to set it to auto calibration which will use the GPS. Garmin has a table with wheel and tyre dimensions and the corresponding circumference but my experience is that the auto calibration do it better.

    support.garmin.com/.../

  • 0 over 3 years ago in reply to e7andy

    I think i'm really really DUMB!!!

    How can i not notice that? I'm speechless.

    I'm in italy so we use mm instead of inch, and when i put the data on garmin I didn't think about that.

    Fortunately I only made few rides

    Thanks for help, really appreciated