The TomTom Cadence Sensor consists of the following parts:
To use the TomTom Cadence & Speed Sensor with your watch, do the following:
Attach the chainstay sensor to the chainstay on your bicycle, using three of the cable ties provided. Use two ties for the main body of the sensor and one tie for the smaller part of the sensor. You may need to adjust the position of the sensors so don't tighten the ties completely just yet.
Important: The smaller part of the sensor needs to face the crankarms and should not be attached to the top of the chainstay. You may have to tilt the main body of the sensor towards the wheel depending on your bicycle. You may need to adjust the position of the sensors so don't tighten the ties completely just yet.
Attach the spoke magnet to one of the spokes on your bike wheel. The magnet should face the chainstay where you attached the chainstay sensor.
Adjust the position of the spoke magnet and the chainstay sensor so that when the wheel turns, the spoke magnet passes the tip of the main body of the chainstay sensor.
Important: The distance between the chainstay sensor and the spoke magnet should not be more than 2 mm when they pass each other. On some bikes, you may have to tilt the main body of the sensor towards the wheel.
Attach the crankarm magnet to one of the crankarms on your bike. The magnet should face the chainstay where you attached the chainstay sensor.
Adjust the position of the crankarm magnet and the chainstay sensor so that when the crankarm turns, the crankarm magnet passes the tip of the smaller part of the chainstay sensor. Important: The distance between the chainstay sensor and the crankarm magnet should not be more than 2 mm when they pass each other.
Once you have adjusted the sensors to the right position, tighten the cable ties so they are held securely in place.
Move your bicycle or its crankarm so that at least one of the magnets passes the sensor. This switches on the sensor.
From the clock screen on your watch, press the down button.
Select Sensors, then move right.
Select Bike, then move right.
Move up or down to turn the sensor on.
When you begin a workout, your watch connects to the sensor and you see an icon of a chainring at the bottom of the screen.
When your watch is trying to connect to the Cadence & Speed Sensor, the chainring flashes.
The first time your watch tries to connect to your sensor, if it finds more than one sensor, your watch doesn't know which sensor to connect to. Move to a place where there are no other sensors within range of your watch.
Once you have connected to your sensor once, your watch always reconnects to your sensor.
Tip: When the chainring icon has stopped flashing, your watch is ready to measure your speed and cadence. For proper GPS tracking on a map wait until the GPS icon has also stopped flashing before you start your cycle activity.