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That's it! The speed sensor!
Ebay magene OK?
I'd be happy to take them off your hands if you really don't need it. (thank you for the offer!)
Do they no longer need a magnet on the spokes?!
The speed sensor? Any ANT+ unit should do the job. I suspect I've got a Garmin GSC-10 speed/cadence sensor going spare if you want one.
ANT+ is a wireless communications protocol. Used by HRMs, speed/cadence sensors and power meters.
In theory all ANT+ sensors and head units are compatible, so it doesn't have to be a Garmin speed sensor.