Garmin speed sensor
Product rating for Garmin speed sensor
Just works
I purchased it for the unicycle where traditional sensors are useless.
Simple to install, just works. Automatic calibration (with FR920xt) makes it really easy to set up.
Pro
- Single-piece device, no magnet on the spoke
Contra
- It might be less expensive :-)
- For some reason can't reliably measure speeds under 1-2 kph