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Garmin 1030 howto calibrate speed sensor

5594904
over 4 years ago

Hi all

I try to set the diameter of whell in edge 1030 with garmin speed sensor 2.

In parameters screen advanced the is no tab to fil the wheel 's diameter.

Do i need to ride outside with the GPS to calibrate tjis sensor ? 

If not how the sensor could determinate if it's an VTT or road bicycle ?

Thanks a lot for your responses 

  • 0 over 4 years ago

    I find you have to pedal to show the tab in sensor screen ! => please garmin update documentation because nothing write about it !

  • 0 over 4 years ago

    For the wheel diameter I think it is best to leave the sensor at "Auto Calibration" if you ride outside. It will then use GPS based measures and figure the exact wheel diameter. If you ride inside only with the sensor then you need to enter it by hand. You can measure the outside diameter of the wheel+tire, then guess how much you compress the tire when seating on the bike and make that your effective wheel diameter. 

  • 0 over 4 years ago in reply to Martin868

    - It is about wheel circumference not diameter!
    (I know, the circumference and the diameter are linked by Pi. But you have to enter the circumfence.)

    - To leave the speed sensor on „Auto Calibration“ is not a good idea, because autocalibration is done over and over again. If you ride under bad GPS conditions (trees, big buildings) your speed and thus the circumference will be wrong.
    But you can use autocalibration once you are in the plains with a good GPS fix and on a straight course to find out the circumference which you then type in for manual setting.

  • 0 over 4 years ago in reply to mcinner1

    My experience is that the GPS distance is shorter than the distance calculated using the circumference data (eg from https://www.cyclinguk.org/cyclists-library/components/wheels-tyres/tyre-sizes ). My conclusion is that the GPS data is averaged in order to reduce the effect of measurement variability but this averaging then smoothes the route followed by the bicycle. Measurement using the wheel, in contrast, includes every wiggle in the road and any extra wiggles by the cyclist to avoid potholes or other obstacles. However, this extra distance can be offset by the actual tyre circumference not being as much as the nominal tyre size due to running at medium, not high, pressure or the rims being wider than the tyre manufacturer assumed in their sizing.