Garmin has a really neat ANT+ speed-sensing device, which fits to the hub and does away with the need for a spoke-mounted magnet. It can also be bought in conjunction with a magnet-less cadence sensor, and if you don't want the cadence sensor, that is where the pairing problem can arise.
By the way, my motivation for doing this is to create a little bit more realism when turbo training. I have a crank-based power meter that also measures cadence, and fancy keeping a reasonable track of the distance I might have covered in the session. When you're turbo training, every motivation counts!
First of all, install the ANT+ speed sensor on the rear wheel as per instructions in your manual. Also disable any other ANT+ sensors nearby (eg, a power meter) by removing the battery.
On your Garmin computer (in my case a Forerunner 310xt) use the mode, enter and arrow keys to navigate Settings: Bike Settings:
Then choose your custom bike profile. If you don't already have one, follow the instructions in your user manual.
Then select Ant+ Spd/Cad: More: and then select just "Spd Sensor". If Spd/Cad Sensor is selected, a speed sensor by itself will not be found.
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