Introduction
The Polar Speed and Cadence sensors are designed to accurately measure your cycling speed, distance, and pedaling frequency. This combo set utilizes Bluetooth Smart technology for efficient data transmission to compatible Polar devices and smartphones. This manual provides essential information for the proper installation, operation, and maintenance of your sensors.
Key Features:
- Accurate measurement of cycling speed and distance.
- Precise pedaling cadence tracking for technique improvement.
- Bluetooth Smart connectivity for seamless data transfer.
- Compatible with Polar V800, V650, M450, and selected iOS/Android devices.
Setup and Installation
Package Contents:
- Polar Speed Sensor
- Polar Cadence Sensor
- Mounting accessories
- Lithium Polymer batteries (pre-installed)
Sensor Placement:
Ensure both sensors are securely mounted to your bicycle according to the following guidelines:
Speed Sensor Installation:
The speed sensor is typically mounted on the front fork of your bicycle, with the magnet attached to a spoke on the front wheel. Position the sensor so that the magnet passes closely by the marked area on the sensor with each wheel rotation.
Cadence Sensor Installation:
The cadence sensor is mounted on the chainstay of your bicycle, with the magnet attached to the inside of the crank arm. Ensure the magnet passes closely by the marked area on the sensor with each pedal revolution.

Image: Polar Bluetooth Smart Speed and Cadence Sensors. The image displays two black, oval-shaped sensors with the 'Polar Bluetooth SMART' logo, designed for bicycle mounting.
Pairing with Your Device:
- Activate Bluetooth on your compatible Polar device (V800, V650, M450) or smartphone.
- Refer to your device's specific instructions for adding new Bluetooth Smart sensors.
- Rotate the wheel (for speed sensor) or crank (for cadence sensor) a few times to activate the sensors.
- Select the Polar Speed Sensor and Polar Cadence Sensor from the list of available devices to pair.
- Confirm pairing on your device.
Operation
Once paired, your Polar Speed and Cadence sensors will automatically connect to your device when active and within range. Begin your cycling activity as usual, and your device will start recording speed, distance, and cadence data.
Data Analysis:
After your training session, synchronize your device with the Polar Flow web service or mobile application to analyze your performance data. This platform provides detailed insights into your speed, distance, cadence, and other relevant metrics.
For more information on using the Polar Flow service, please visit flow.polar.com.
Maintenance
Cleaning:
Clean the sensors regularly with a mild soap and water solution. Rinse thoroughly and dry with a soft towel. Avoid using alcohol or abrasive materials that could damage the sensor casing.
Battery Information:
The sensors are powered by Lithium Polymer batteries, which are included and pre-installed. The battery life is designed for extended use. If you experience issues with sensor functionality, ensure the sensors are clean and properly positioned before considering battery-related troubleshooting.
Troubleshooting
Sensor Not Connecting/Pairing:
- Ensure Bluetooth is enabled on your receiving device.
- Verify that the sensors are properly installed and the magnets are correctly aligned and passing close to the sensor's marked area.
- Rotate the wheel/crank to activate the sensors.
- Check for any obstructions or interference between the sensors and your device.
- Try restarting your receiving device and repeating the pairing process.
Inaccurate Readings:
- Confirm the magnets are securely attached and correctly positioned relative to the sensors.
- Ensure the wheel size setting on your cycling computer or app is accurate.
- Check for any physical damage to the sensors or magnets.
Short Battery Life:
While the sensors are designed for long battery life, extreme temperatures or prolonged storage can affect performance. If you suspect a battery issue, contact Polar customer support for assistance.
Specifications
| Feature | Detail |
|---|---|
| Brand | Polar |
| Product Model Number | 91053157 |
| Internal Model Number | 91047327 |
| Connectivity | Bluetooth Smart |
| Compatible Devices | Polar V800, V650, M450, selected iOS and Android devices |
| Material | Plastic |
| Weight | Approximately 100 g (total for set) |
| Battery Type | Lithium Polymer (LiPo) |
| Number of Items | 2 (Speed Sensor, Cadence Sensor) |
| Usage | Cycling |
Warranty and Support
For warranty information, technical support, or service requests, please refer to the official Polar website or contact your local Polar customer service representative. Keep your proof of purchase for warranty claims.
Official Polar Website: www.polar.com







