Introduction
This manual provides comprehensive instructions for the setup, operation, and maintenance of your VDO M3.1 WL Updated Cycling Computer. Designed for cyclists, this digital, wireless device offers 17 essential functions to enhance your riding experience. Please read this manual carefully before using the product to ensure optimal performance and longevity.

Figure 1: Front view of the VDO M3.1 WL Cycling Computer, displaying speed and cadence.
Setup
1. Package Contents
Before beginning installation, verify that all components are present in the package:
- VDO M3.1 WL Cycling Computer Unit
- Speed Sensor
- Mounting Bracket for Handlebar
- Wheel Magnet
- Cable Ties for mounting
- Lithium Battery (pre-installed or separate)
2. Battery Installation
The VDO M3.1 WL uses a Lithium battery. If not pre-installed, open the battery compartment on the rear of the computer unit using a small coin or screwdriver. Insert the battery with the correct polarity, then securely close the compartment.
3. Mounting the Computer Unit
Attach the handlebar mount to your bicycle's handlebar using the provided cable ties. Ensure the mount is securely fastened and positioned for easy viewing during your ride. Slide the VDO M3.1 WL computer unit onto the mounting bracket until it clicks into place.

Figure 2: The VDO M3.1 WL Cycling Computer securely mounted on a bicycle handlebar.
4. Mounting the Speed Sensor and Magnet
Mount the speed sensor to the front fork of your bicycle using the provided cable ties. Position the sensor so that it aligns with the wheel magnet. Attach the wheel magnet to a spoke on your front wheel. Ensure the magnet passes within 5mm of the sensor as the wheel rotates. Adjust the sensor and magnet positions as needed for proper alignment and detection.

Figure 3: The speed sensor and wheel magnet installed on the bicycle's front fork and wheel.
5. Initial Configuration
Upon first power-on or after battery replacement, the computer will prompt you to set basic parameters. Use the buttons on the unit to navigate through the settings. Key settings include:
- Wheel Size: Input your wheel circumference for accurate speed and distance measurements. Refer to your tire's sidewall for size, or measure manually.
- Units: Select between kilometers (km/h) and miles (mph).
- Time: Set the current time.
Consult the detailed instructions provided with the product for specific button functions during configuration.
Operating the VDO M3.1 WL
The VDO M3.1 WL Cycling Computer features an intuitive LCD display and button interface for easy operation. It offers 17 functions, including current speed, average speed, maximum speed, trip distance, total distance, ride time, clock, and more.
1. Basic Navigation
The computer typically has one or more buttons for navigation. Pressing a button usually cycles through different display modes (e.g., speed, distance, time). A long press may activate settings or reset functions.
2. Wireless Connectivity
The M3.1 WL utilizes wireless technology (Bluetooth) to communicate with the speed sensor. Ensure the sensor is correctly installed and within range for accurate data transmission. The display will indicate if a signal is being received.
3. Function Overview
While specific functions are detailed in the product's quick start guide, common functions include:
- Current Speed (km/h or mph)
- Average Speed
- Maximum Speed
- Trip Distance
- Total Distance (Odometer)
- Ride Time
- Clock
- Cadence (if optional cadence sensor is used)
- Temperature
Refer to the on-screen indicators and the product's quick reference guide for detailed explanations of each function and how to access them.
Maintenance
1. Cleaning
Clean the computer unit and sensors with a soft, damp cloth. Do not use abrasive cleaners or solvents, as these can damage the display or casing. Ensure the unit is dry before storage or next use.
2. Battery Replacement
When the battery indicator appears on the display, replace the battery promptly. Use a fresh Lithium battery of the specified type. Dispose of old batteries responsibly according to local regulations.
3. Water Resistance
The VDO M3.1 WL has an International Protection Rating of IPX4, meaning it is resistant to splashing water from any direction. It is suitable for use in light rain but should not be submerged in water.
4. Storage
When not in use for extended periods, store the cycling computer in a cool, dry place away from direct sunlight and extreme temperatures. Removing the battery for long-term storage is recommended to prevent leakage.
Troubleshooting
If you encounter issues with your VDO M3.1 WL Cycling Computer, refer to the following common problems and solutions:
- No Display/Blank Screen:
- Check battery installation and polarity.
- Replace the battery if it is low or depleted.
- No Speed Reading:
- Ensure the speed sensor and wheel magnet are correctly aligned and within 5mm of each other.
- Check the battery in the speed sensor (if applicable, some sensors have separate batteries).
- Verify that the computer is paired with the sensor (refer to initial setup instructions).
- Incorrect Readings:
- Confirm that the wheel size setting is accurate.
- Check for any interference from other electronic devices.
- Buttons Unresponsive:
- Try resetting the unit (refer to product-specific reset procedure).
- Ensure no debris is lodged around the buttons.
For persistent issues not covered here, please contact VDO customer support.
Specifications
| Feature | Detail |
|---|---|
| Brand | VDO |
| Model | M3.1 WL (Part No. 30035_noir) |
| Color | Black |
| Display Type | LCD |
| Sensor Type | Speed Sensor |
| Battery Cell Composition | Lithium |
| Connectivity Technology | Bluetooth (Wireless) |
| Included Components | Cycling Computer, Speed Sensor |
| International Protection Rating | IPX4 (Splash resistant) |
| Mounting Type | Handlebar Mount |
| Human Interface Input | Buttons |
| Item Weight | 0.09 Kilograms |
| Item Dimensions (LxWxH) | 1.38 x 0.63 x 1.77 inches |
| Functions | 17 functions (digital, wireless) |
Warranty and Support
For information regarding product warranty, please refer to the warranty card included with your purchase or visit the official VDO website. For technical support, troubleshooting assistance beyond this manual, or spare parts, please contact VDO customer service through their official channels.
VDO Official Website: www.vdo-cyclecomputing.com (Example link, actual link may vary)





