The cadence sensor on your electric bike is essential for detecting your pedaling motion and enabling the pedal-assist function. If the cadence sensor is malfunctioning or damaged, it can prevent your pedal assist from working properly. Fortunately, replacing a cadence sensor is a straightforward process. This guide will walk you through the steps to replace your cadence sensor and get your e-bike back in optimal condition

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Tools and Materials You'll Need:

• Replacement cadence sensor compatible with your e-bike
• Screwdriver set (if needed)
• Zip ties (optional for wire management)

Step 1: Power Off and Remove the Battery

As with any electrical work on your e-bike, the first step is to turn off the bike and remove the battery to avoid any electrical hazards.

• Power off the bike: Turn off the bike using the display or power button.
• Disconnect the battery: Remove the battery from the bike according to your model’s instructions.

Step 2: Locate the Cadence Sensor

The cadence sensor is located near the crankset (pedal area) of your bike, attached to either the chainstay or the bottom bracket.

• Look for the sensor: It will be a small component mounted near the rotating magnets on the crank arm. The magnets pass by the sensor as you pedal, which triggers the pedal assist.

Step 3: Remove Crank Arm and the Old Cadence Sensor

Before replacing the cadence sensor, you will need to remove the crank arm to access the sensor more easily.

• Remove the crank arm: Use a crank puller or a hex key (depending on your bike model) to remove the crank arm. This step will give you better access to the cadence sensor.

  1. Loosen the bolt securing the crank arm using a hex key or appropriate tool.
  2. Once the bolt is removed, use a crank puller to gently remove the crank arm from the bike.

• Disconnect the old cadence sensor: Locate the wire connecting the cadence sensor to the controller and unplug it. Ensure not to pull or damage the wire while disconnecting.To access the connector, please refer to the article How to Replace the Hub Drive Motor Controller on Your Electric Bike.

• Remove the sensor: With the crank arm out of the way, gently pull out and detach the sensor.

Step 4: Install the New Cadence Sensor

Now that the old sensor is removed, you can install the new one.

• Position the new sensor: Place the new cadence sensor in the same location as the old one. Ensure the sensor is properly snagged into the bottom bracket.

Step 5: Reconnect the Sensor Wire

Once the new sensor is securely in place, reconnect the wiring.

• Plug in the connector: Connect the new cadence sensor’s wire to the controller by plugging in the connector. Ensure the connection is firm and pushed all the way in to prevent any loose connections.

Step 6: Power On and Test the Pedal Assist

Now that the new cadence sensor is installed and connected, it’s time to test the pedal assist.

• Reconnect the battery: Install the battery back onto the bike and power it on.
• Test the pedal assist: Start pedaling to see if the pedal assist engages as it should. If everything is functioning properly, the motor should activate when you pedal.

Step 8: Finalize Installation

If the pedal assist is working correctly, finalize the installation by securing any loose wires.

• Use zip ties: Neatly organize and secure the sensor’s wire using zip ties to keep it out of the way of moving parts like the chain, pedals, and tires.
• Tidy up: Ensure the sensor and wire are safely out of harm’s way to avoid damage during your rides.