Pairing sensors with your watch

Pair a heart rate sensor with your watch

When you're wearing a Polar heart rate sensor that's paired with your watch, the watch does not measure heart rate from the wrist.

Polar H9, Polar H10

  1. Wear the moistened heart rate sensor.
  2. On your watch, go to General Settings > Pair and sync > Pair sensor or other device and press OK.
  3. The watch starts searching for your sensor.
  4. Once the heart rate sensor is found, the device ID, for example, Polar H10 xxxxxxxx is displayed. Press OK to start pairing.
  5. Pairing completed is displayed when you are done.

Polar OH1+, Polar Verity Sense

  1. Place the sensor into the armband holder with the lens facing up.


  2. Turn the sensor on by pressing the button until the light is switched on.
  3. Verity Sense: Make sure the sensor is in the heart rate mode marked with a heart icon. After choosing the mode, wait until all six leds light up, and you can then start pairing your Polar watch.


  4. On your watch, go to General Settings > Pair and sync > Pair sensor or other device and press OK.
  5. Once the heart rate sensor is found, the device ID, for example, Polar Sense xxxxxxxx is displayed. Press OK to start pairing.
  6. Pairing completed is displayed when you are done.

Pair a cycling sensor with your watch

Before pairing a cadence sensor, speed sensor or a third-party power sensor, make sure they have been correctly installed. For more information on installing the sensors see their user manuals.

If you are pairing a third-party power sensor, please make sure that you have the latest firmware both in your watch and the sensor. If you have two power transmitters, you need to pair the transmitters one at a time. After pairing the first transmitter, you can immediately pair the second one. Check the device ID on the backside of each transmitter to make sure you find the correct transmitters from the list.

  1. On your watch, go to General Settings > Pair and sync > Pair sensor or other device and press OK.
  2. The watch starts searching for your sensor. Cadence sensor: Rotate the crank a few times to activate the sensor. The flashing red light in the sensor indicates that the sensor is activated. Speed sensor: Rotate the wheel a few times to activate the sensor. The flashing red light in the sensor indicates that the sensor is activated. Third-party power sensor: Rotate the cranks to wake up the transmitters.
  3. Once the sensor is found, the device ID is displayed. Press OK to start pairing.
  4. Pairing completed is shown when you are done.

Bike settings

  1. Sensor linked to: is displayed. Choose Bike 1, Bike 2 or Bike 3. Confirm with OK.
  2. Set wheel size is displayed if you paired a speed sensor or a power sensor that measures speed. Set the size and press OK. You can set the size from 100 mm to 3999 mm.
  3. Crank length: Set the crank length in millimeters. The setting is visible only if you paired a power sensor.

Measuring wheel size

Wheel size settings are a prerequisite for correct cycling information. There are two ways of determining the wheel size of your bike:

Method 1

  • Measure the wheel manually for the most accurate result.
  • Use the valve to mark the point where the wheel touches the ground. Draw a line on the ground to mark that point. Move your bike forward on a flat surface for one complete rotation. The tire should be perpendicular to the ground. Draw another line on the ground at the valve to mark a full rotation. Measure the distance between the two lines.
  • Subtract 4 mm to account for your weight on the bike to get your wheel circumference.

Method 2

Look for the diameter in inches or in ETRTO printed on the wheel. Match it to the wheel size in millimeters in the right column of the chart.

ETRTO Wheel size diameter (inches) Wheel size setting (mm)
25-559 26 x 1.0 1884
23-571 650 x 23C 1909
35-559 26 x 1.50 1947
37-622 700 x 35C 1958
52-559 26 x 1.95 2022
20-622 700 x 20C 2051
52-559 26 x 2.0 2054
23-622 700 x 23C 2070
25-622 700 x 25C 2080
28-622 700 x 28 2101
32-622 700 x 32C 2126
42-622 700 x 40C 2189
47-622 700 x 47C 2220

Wheel sizes on the chart are advisory as wheel size depends on the wheel type and air pressure.

Calibrate cycling power sensor

You can calibrate the sensor from the quick menu. First, choose one of the cycling sport profiles and wake up the transmitters by rotating the cranks. Then choose Calibrate power sensor from the quick menu and follow the on-screen instructions to calibrate your sensor. For calibration instructions specific to your power sensor, see the manufacturer's instructions.

Pair a stride sensor with your watch

  1. To pair a Bluetooth-compatible stride sensor with your watch, go to General Settings > Pair and sync > Pair sensor or other device and press OK.
  2. The watch starts searching for your sensor.
  3. Once the sensor is found, the device ID is displayed. Press OK to start pairing.
  4. Pairing completed is displayed when you are done.

Calibrate stride sensor

There are two ways to manually calibrate your stride sensor via the quick menu. Choose one of the running sport profiles and then choose Calibrate stride sensor > Calibrate by running or Calibration factor from the quick menu.

  • Calibrate by running: Start the training session and run a distance you know. The distance has to be more than 400 meters. When you have run the distance, press OK to take a lap. Set the actual distance you have run and press OK. The calibration factor is updated.

    Please note that interval timer cannot used during the calibration. If you have set the interval timer on, the watch will ask you to turn it off to enable manual stride sensor calibration. You can turn the timer on from the pause mode quick menu after calibration.

  • Calibration factor: Set the calibration factor manually if you know the factor which gives you accurate distance.

For detailed instructions on manual and automatic calibration of a stride sensor, see Calibrating a stride sensor with Grit X/Pacer/Vantage.

Delete a pairing

To delete a pairing with a sensor or mobile device:

  1. Go to Settings > General settings > Pair and sync > Paired devices and press OK.
  2. Choose the device you want to remove from the list and press OK.
  3. Remove pairing? is displayed. Confirm by pressing OK.
  4. Pairing removed is displayed when you are done.