1. Product Overview
The CooSpo BK9C is a lightweight and compact cadence sensor designed to accurately measure your cycling cadence in real-time. It utilizes advanced dual-meter hybrid algorithm technology, eliminating the need for magnets. With Bluetooth 5.0 and ANT+ connectivity, it is compatible with a wide range of fitness apps, GPS bike computers, and smartwatches.
Image: CooSpo BK9C Cadence Sensor highlighting Bluetooth 5.0, ANT+, Cadence, LED Indicator, IP67, Light & Thin features.
Key Features:
- Dual Connectivity: Bluetooth 5.0 and ANT+ for broad compatibility.
- Magnet-Free Design: Advanced dual-meter hybrid algorithm for easy installation.
- Real-time Cadence Measurement: Improve your cycling performance.
- IP67 Waterproof: Resistant to water splashes and dust.
- Long Battery Life: Approximately 300 hours of operation.
- Compact and Lightweight: Weighs only 8.4g.
2. Package Contents
- CooSpo BK9C Cadence Sensor
- CR2032 Battery (pre-installed or separate)
- Rubber Pad
- Rubber Bands (for installation)
- User Manual
3. Setup and Installation
3.1 Battery Installation
The BK9C sensor uses a CR2032 coin cell battery. If the battery is not pre-installed or needs replacement, follow these steps:
- Gently twist the battery cover counter-clockwise to open it.
- Insert a new CR2032 battery with the positive (+) side facing up.
- Align the battery cover and twist clockwise to close it securely.
Image: Exploded view of the sensor showing the CR2032 battery and its compartment.
3.2 Sensor Installation
The BK9C sensor is designed for easy, magnet-free installation on your bicycle's crank arm.
- Place the sensor into the provided rubber pad. Ensure it fits snugly.
- Attach the sensor (with the rubber pad) to the inside of your bicycle's crank arm using the provided rubber bands. Make sure it is securely fastened and does not interfere with pedaling.
Image: Step 1 of installation, showing the sensor being inserted into its rubber mounting base.
Image: Step 2 of installation, showing the sensor attached to the bicycle crank arm.
Image: Diagram illustrating the internal accelerometer and magnetometer, enabling magnet-free operation.
4. Operating Instructions
4.1 Activating the Sensor
After installation, rotate your bicycle's crank arm a few times to activate the sensor. The blue LED indicator on the sensor will flash, indicating it is active and ready to connect.
Image: Close-up of the BK9C sensor showing the blue LED indicator.
4.2 Pairing with Devices
The CooSpo BK9C supports both Bluetooth 5.0 and ANT+ protocols, allowing it to connect to various devices:
- GPS Bike Computers: Compatible with popular GPS bike computers like Wahoo, Garmin, and CooSpo models.
- Smartwatches: Connects to smartwatches that support ANT+ or Bluetooth cycling sensors.
- Fitness Apps: Pair with cycling-specific fitness applications on your smartphone.
Image: The BK9C sensor shown with compatible GPS bike computers, displaying various cycling metrics.
Image: A cyclist wearing a smartwatch, demonstrating compatibility with the BK9C sensor.
Image: The BK9C sensor connecting to a smartphone app and a bike computer, illustrating Bluetooth 5.0 and ANT+ technology.
To pair, enable Bluetooth or ANT+ on your receiving device, then search for and select the CooSpo BK9C sensor from the list of available devices. Follow the on-screen prompts to complete the pairing process.
4.3 Real-time Cadence Measurement
Once paired, your device will display real-time cadence data as you pedal. This information can help you monitor and improve your cycling efficiency and training.
Image: A graph showing real-time cadence measurement (RPM) during a cycling activity, with the sensor visible on the crank arm.
5. Maintenance
5.1 Cleaning
The BK9C sensor has an IP67 waterproof rating, meaning it is protected against dust and temporary immersion in water. You can wipe it clean with a damp cloth. However, avoid soaking the device in water or cleaning it with high-pressure water jets, as this may damage the internal components.
Image: The BK9C sensor partially submerged in water, illustrating its IP67 waterproof rating. Note: "No soaking and high pressure cleaning."
5.2 Battery Replacement
When the battery is low, the LED indicator may not light up or may flash irregularly. Replace the CR2032 battery as described in Section 3.1. The typical battery life is approximately 300 hours, but actual life may vary based on usage and environmental conditions.
6. Troubleshooting
- Sensor not activating: Ensure the battery is correctly installed and has sufficient charge. Rotate the crank arm several times to wake up the sensor.
- Cannot find sensor on device: Make sure the sensor is active (LED flashing). Check that Bluetooth/ANT+ is enabled on your receiving device and that it's within range. Try restarting both the sensor (by removing and reinserting the battery) and your receiving device.
- Inaccurate readings: Ensure the sensor is securely mounted on the crank arm and not moving or vibrating excessively. Check for any physical obstructions.
- LED not flashing: This usually indicates a dead battery. Replace the CR2032 battery.
7. Specifications
| Feature | Specification |
|---|---|
| Model | BK9C |
| Brand | COOSPO |
| Material | Plastic |
| Connectivity | Bluetooth 5.0, ANT+ |
| Waterproof Rating | IP67 |
| Battery Type | CR2032 Coin Cell |
| Battery Life | Approx. 300 hours |
| Dimensions (L x W x H) | 1.3 inch x 1.2 inch x 0.3 inch (approx.) |
| Weight | 8.4g |
| Measurement Method | Advanced Dual Meter Hybrid Algorithm (Magnet-free) |
Image: Visual representation of the sensor's dimensions (1.2in width, 1.3in length, 0.3in thickness) and weight (8.4g).
8. User Tips
- Secure Mounting: Ensure the sensor is tightly secured to the crank arm. Loose mounting can lead to inconsistent readings or the sensor falling off during rides.
- Activate Before Pairing: Always rotate the crank a few times to wake up the sensor and see the LED flash before attempting to pair it with your device.
- Check Battery First: If you experience connectivity issues or no readings, the first step should always be to check or replace the battery.
- Firmware Updates: Periodically check the CooSpo official website or app for any available firmware updates for your sensor to ensure optimal performance and compatibility.
9. Warranty and Support
For warranty information, technical support, or any product-related inquiries, please contact the manufacturer or your point of purchase. Keep your proof of purchase for warranty claims.
