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How to set wheel circumference in Edge 1030

Former Member over 7 years ago

I got a new Edge 1030 to replace my trusty Edge 500. To start out I'm using both together, but the 1030 records slower speeds and shorter distances. (I paired the 1030 with the 500's speed/cadence sensor, so both devices were using the same sensors). Dang, I was hoping the new toy would make me go faster and farther, not shorter and slower! :-) I presume I need to set the wheel circumference, but for the life of me, I can't find where to set that. What guidance I've found online doesn't seem to apply, i.e., there's no setting under sensor settings for wheel size.

So, how does one set the wheel size on an Edge 1030?

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0 aweatherall over 7 years ago

The setting is accessible under the sensor details for the speed sensor when the Edge and speed sensor are in communication.

0 Former Member over 7 years ago

I too have noticed slight differences between me and a friend during late summer rides of the same speed/distance using my 1030 as opposed to my 820 unit before. I too have now set the wheel circumferences manually but i still believe a minute issue may still be present.

0 Former Member over 7 years ago

OK, I disabled and re-enabled the speed/cadence sensor while turning the crank, and that indeed displayed the wheel circumference option under sensor settings. Not at all obvious, so thanks for the tip!

0 Bike_John over 7 years ago

It’s my understanding that Edge speed is always based on GPS when available, and that the speed sensor is simply a fallback when there is no signal: in tunnels, under heavy tree cover, or an indoor trainer profile with the GPS radio disabled.

0 aweatherall over 7 years ago

Actually it is the other way around. If a speed sensor is present then that will take priority over using GPS data for speed/distance.

0 gaijin over 7 years ago

It’s my understanding that Edge speed is always based on GPS when available, and that the speed sensor is simply a fallback when there is no signal: in tunnels, under heavy tree cover, or an indoor trainer profile with the GPS radio disabled.

aweatherall is absolutely correct. When a speed sensor is present it is the sole source for speed information. You can easily test this yourself - with a speed sensor active and a strong GPS signal available, while stopped lift the wheel with the speed sensor and rotate it. You will see the indicated speed on the Edge increase.

HTH

0 Bike_John over 7 years ago

Does the automatic wheel size calibration automatically recalibrate, for instance, if the wheel is changed or a new tire with a different size is used?

Edit: What I'm noticing is that the automatically calibrated wheel size is reporting 2075mm, where the chart in the owners manual appendix is saying 2105mm.

0 aweatherall over 7 years ago

The wheel sizing calculation is running all the time during an activity and uses a moving average to make adjustments to avoid large swings due to a bad data value.

0 mmtsvl over 5 years ago in reply to aweatherall

@aweatherall Is this information confirmed officially? I have been trying to find an official source on it but instead I found some old horseshoes, needle in a hay sack and some dead fish.

0 aweatherall over 5 years ago in reply to mmtsvl

Yes. The information is correct. If the unit is set to automatic it is constantly computing the value if the GPS is enabled and will make changes using a moving average.

If you check the value currently displayed under the sensor settings you may see that it is slightly different after each ride.

I personally manually set the size after doing a roll-out to get the size.