Both of my GSC-10 wheel sensors quit working recently. One of them at first. It was intermittent while riding. (I'd had occasional sensor problems in past years, but it "fixed itself", and a stronger magnet helped, too). This time, a new battery didn't fix it. So I installed the other one, and it failed a few months later.
The blinking status light didn't flash when the magnet passed by, so I think it was dead.
With the GSC-10, the spoke magnet position was critical. If it was moved maybe 5mm, it just didn't trigger consistently. And the gap needed to be very narrow. I adjusted while watching the status light flashing.
One sensor was probably 15 years old? The other one about 8 years.
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I switched to the Garmin Speed Sensor2, wrapped around the front wheel hub. That's easier and works consistently. (I had to turn off it's bluetooth ride uploads! it started a new "ride" on my phone's Garmin Connect every time I walked the bike, turning the wheel. No!)
Last edited by rm -rf; 08-12-22 at 05:44 AM.