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Garmin SpeedSensor 2 giving inconsistent speed

Hqduong 1 month ago

I have a speedsensor and an edge 1040 solar that has been great.

recently I noticed that the speed on my edge is randomly dropping to nearly half the speed I would expect. I would be risking 23 mph and then it would cut in half to 12 or so speed for a few seconds and going back to 23 mph.

I thought it’s a signal problem, but it doesn’t look like it since there isn’t even cell signal where I ride.

i have tried changing the battery without any change.

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0 looigi 1 month ago

That's odd. The current Garmin speed and cadence sensors use the Earth's magnetic field to sense rotation. Perhaps you have a leftover wheel magnet or cadence magnet or something else that might be affecting it?

0 gorsjo 1 month ago

I have exactly the same problem. Never happened to me before the update to 27.14. Now I can´t use it anymore, the speed varies from 30 km/h to 75 km/h in the same slope. I hope that it will work again with the next upgrade.

+1 Hqduong 1 month ago in reply to gorsjo

I was able to solve this today. Was yours on the rear tire?

I have a DTswiss 180 hub on the front and the straps are too long, so I ended putting it on the rear wheel. I heard these sensors use the earth’s magnetic field, so maybe there is more interference back there next to the cassette.

so I ended up twisting the band a few times to put it in the front. It solved the issue for me today.

0 gorsjo 1 month ago in reply to Hqduong

I have it on the the rear tire. I will try your solution, thanks!

0 Hqduong 1 month ago in reply to gorsjo

Let me know if it works. I like it to help other people as well.

0 mcbit 1 month ago in reply to Hqduong

I've always used mine on the front for the simple reason that its nearer to the Head Unit or watch, never had an issue unless the battery starts to run down.

0 Hqduong 1 month ago in reply to mcbit

The problem is some hubs, especially the high end ones have axles way too small to mount with the included band.

0 Cristox 1 month ago in reply to Hqduong

Wrap the rubber band twice around the hub