1. Product Overview
The COOSPO BK9C Cadence Sensor is designed to accurately track and provide real-time cycling cadence data (revolutions per minute, RPM) to your bike computer or cycling applications. This sensor utilizes dual-band technology, supporting both ANT+ and Bluetooth 5.0, ensuring broad compatibility with various devices and platforms. It is built for durability with an IP67 waterproof rating and offers a long battery life for extended use.
Image 1.1: The COOSPO BK9C Cadence Sensor. This compact device attaches to your bike's crank arm to measure pedaling speed.
2. What's in the Box
Verify that all components are present in the package:
- COOSPO BK9 Cycling Cadence Sensor (1 unit)
3. Setup Instructions
3.1 Battery Installation
The sensor comes with a pre-installed CR2032 battery. Before first use, you may need to remove a small insulation film. The sensor features a tool-free battery replacement design.
- Locate the battery cover on the back of the sensor.
- Twist the cover counter-clockwise to open.
- Remove any protective film from the battery (if present).
- Insert the CR2032 battery with the positive (+) side facing upwards.
- Replace the cover and twist clockwise to secure it.
Image 3.1: Exploded view showing the CR2032 battery being inserted into the sensor, highlighting its long battery life.
Image 3.2: Comparison showing the COOSPO BK9's tool-free battery replacement design versus other sensors that require tools.
3.2 Mounting the Sensor
The BK9C Cadence Sensor is designed for easy, magnet-free installation on your bike's crank arm.
- Identify a suitable flat section on your bike's crank arm.
- Use the provided rubber band or strap to securely attach the sensor to the crank arm. Ensure the sensor is firmly in place and will not interfere with pedaling or other bike components.
- The sensor should be positioned so it can detect the rotation of the crank arm.
Image 3.3: The COOSPO BK9C Cadence Sensor mounted on a bicycle crank arm for real-time cadence measurement.
3.3 Pairing with Devices and Apps
The BK9C sensor supports both Bluetooth 5.0 and ANT+ for wide compatibility.
- Activate the Sensor: Rotate the crank arm a few times to wake up the sensor. The LED indicator on the sensor will flash, indicating it is active and discoverable.
- Enable Bluetooth/ANT+: On your bike computer, GPS watch, or smartphone, ensure Bluetooth or ANT+ is enabled.
- Open Your App/Device Settings: Navigate to the sensor pairing section within your preferred cycling app (e.g., Rouvy, Peloton, Wahoo) or bike computer settings.
- Search for Sensor: Select 'Add Sensor' or 'Search for Devices'. The BK9C sensor should appear in the list of available devices.
- Connect/Pair: Select the BK9C sensor to establish a connection. Once connected, the app or device will display 'Connected' or a similar status.
Important Note for Wahoo App Users: The Wahoo app may not allow pairing with two sensors from other brands simultaneously. If you experience issues, try pairing only the BK9C sensor.
Image 3.4: The COOSPO BK9C Cadence Sensor is compatible with popular fitness applications like CoospoRide, Rouvy, Peloton, Wahoo, and Zwift.
Image 3.5: The sensor connects via ANT+ and Bluetooth to GPS bike computers for displaying real-time cycling data.
Image 3.6: Visual guide on the correct method to connect the sensor with smartphone applications, emphasizing activating the sensor and pairing within the app.
4. Operating Instructions
4.1 Real-time Cadence Measurement
Once successfully paired, the BK9C sensor will transmit real-time cadence data to your connected device or application as you pedal. Cadence is measured in revolutions per minute (RPM).
- Start Cycling: Begin pedaling your bicycle. The sensor will automatically detect movement and start transmitting data.
- Monitor Data: View your current cadence on your bike computer, GPS watch, or cycling app.
- Improve Efficiency: Monitoring your cadence can help you optimize your pedaling technique and improve cycling efficiency, allowing for longer and faster rides.
Image 4.1: The COOSPO BK9C Cadence Sensor provides real-time cadence data to help cyclists improve their performance.
4.2 Dual Band Technology
The sensor's dual ANT+ and Bluetooth 5.0 capabilities allow it to connect to a wide range of devices simultaneously or individually, depending on your setup. This flexibility ensures compatibility with most modern cycling electronics.
5. Maintenance
5.1 Battery Replacement
The COOSPO BK9C Cadence Sensor offers approximately 300 hours of battery life with a CR2032 coin cell battery. When the battery is low, the sensor's LED indicator may change or your connected device may show a low battery warning. Replace the battery following the steps in Section 3.1.
5.2 Cleaning and Storage
The sensor has an IP67 waterproof rating, meaning it is protected against dust and can withstand immersion in water up to 1 meter for 30 minutes. However, avoid high-pressure cleaning or prolonged soaking.
- Wipe the sensor with a damp cloth to clean it.
- Ensure the battery compartment is securely closed after cleaning or battery replacement to maintain its waterproof integrity.
- Store the sensor in a cool, dry place when not in use for extended periods.
Image 5.1: The COOSPO BK9C Cadence Sensor is IP67 waterproof, suitable for various weather conditions. Note: Avoid soaking and high-pressure cleaning.
6. Troubleshooting
- Sensor not connecting:
- Ensure the sensor is awake by rotating the crank arm a few times.
- Check if Bluetooth/ANT+ is enabled on your receiving device.
- Verify the battery is correctly installed and has sufficient charge. Replace if necessary.
- Move closer to the sensor with your receiving device.
- Try restarting your receiving device or cycling app.
- Inaccurate cadence readings:
- Ensure the sensor is securely mounted on the crank arm and not moving or shifting during your ride.
- Check for any physical obstructions that might interfere with the sensor's operation.
- Wahoo App pairing issues:
- The Wahoo app may have limitations on pairing multiple third-party sensors. Try pairing only the BK9C sensor if you are experiencing issues with other sensors connected.
7. Specifications
| Brand | CooSpo |
| Model Name | BK9C |
| Material | Plastic |
| Item Weight | 8 Grams |
| Measurement Accuracy | ±1rpm |
| Measuring Range | 40 - 160 RPM |
| Connectivity | Bluetooth 5.0, ANT+ |
| Waterproof Rating | IP67 |
| Battery Type | CR2032 |
| Battery Life | Approx. 300 hours |
8. Warranty and Support
8.1 Warranty Information
The COOSPO BK9C Cadence Sensor comes with a 12-month warranty from the date of purchase. This warranty covers manufacturing defects under normal use. Please retain your proof of purchase for warranty claims.
8.2 Technical Support
For any problems or assistance needed with your COOSPO BK9C Cadence Sensor, please contact the CooSpo technical support team. They are committed to providing satisfactory solutions.
You can typically find contact information on the official CooSpo website or through the retailer where you purchased the product.
9. Product Videos
Video 9.1: An overview of the COOSPO BK9C Cadence Sensor, demonstrating its features and benefits. (Duration: 0:24)
Video 9.2: A detailed guide on how to set up and use the COOSPO BK9C Cadence Sensor with various cycling devices and applications. (Duration: 1:14)
