Installing the speed sensor
To install the speed sensor and spoke magnet, you need cutters and a cross-head screwdriver.
- It is recommended to install the speed sensor on the front fork of your bicycle (as in picture 1 A).
- Attach the rubber part to the speed sensor (picture 3).
Picture 3.
- Pass the cable ties over the speed sensor and rubber part (picture 2 A). Adjust the sensor to the front fork so that the POLAR logo faces outwards. Adjust the ties loosely. Do not tighten them fully yet.
- Attach the magnet to a spoke at the same level as the speed sensor (picture 2). There is a small caved dot on the backside of the sensor (picture 3 A), which indicates the spot the magnet should be pointing at when passing the sensor. Fasten the magnet to the spoke and tighten it lightly with a screwdriver. Do not tighten it fully yet.
- Fine-tune the positioning of both the magnet and the speed sensor so that the magnet passes close to the sensor but does not touch it (picture 2). Move the sensor towards the wheel/spokes as close as possible. The gap between the sensor and the magnet should be under 4 mm/0.16’’. The gap is correct when you can fit a cable tie between the magnet and the sensor.
- Rotate the front tire to test the speed sensor. The flashing red light on the sensor indicates that the magnet and the sensor are positioned correctly. If you keep rotating the tire, the light will stop flashing. Tighten the screw to the magnet with a screwdriver. Also tighten the cable ties securely and cut off any excess cable tie ends.
Before you start cycling, set the wheel size of your bicycle into the receiving device or mobile application.