1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Walfront YA100 A Cycling Speedometer Bike Computer. Please read this manual thoroughly before using the device to ensure proper function and longevity.
2. Package Contents
Verify that all items listed below are included in your package:
- 1 x Speedometer
- 1 x Speed Cadence Sensor (ABS)
- 1 x Speedometer Bracket
- 1 x Handlebar Mount
- 1 x Wheel Magnet
- 1 x Screw
- 3 x Adhesive Tapes
- 4 x Ties
- 2 x User Manual (this document)

Image: The Walfront YA100 A Speedometer along with its included accessories, such as the sensor, various mounts, and installation hardware.
3. Product Overview
The Walfront YA100 A Cycling Speedometer is designed to provide essential cycling data with ease of use. Key features include:
- 2.8-inch LCD Display: A large, clear screen with soft white backlight for visibility in various lighting conditions.
- Wireless Functionality: Eliminates the need for complex wiring, offering automatic scanning, start, and stop functions.
- Multiple Data Displays: Tracks distance, maximum and average speeds, travel time, calorie consumption, temperature, and stopwatch functions.
- User-Friendly Buttons: Two physical buttons for straightforward operation, even in adverse weather.
- Versatile Mounting: Includes two brackets for extended mounting or direct handlebar attachment.
- Waterproof Design: Engineered to withstand rain and wet conditions.

Image: A close-up view of the Walfront YA100 A Speedometer's 2.8-inch LCD display, showing speed and other metrics.
4. Setup and Installation
Follow these steps to correctly install your bike computer and sensor:
4.1. Speedometer Installation
- Choose Mount: Select either the extended mounting bracket or the handlebar mount based on your preference.
- Secure Bracket: Attach the chosen bracket to your bicycle's handlebar or stem using the provided screws or ties. Ensure it is firmly secured and does not obstruct steering or braking.
- Attach Speedometer: Slide the speedometer onto the bracket until it clicks securely into place.

Image: The Walfront YA100 A Speedometer securely mounted on a bicycle handlebar, ready for use.

Image: A close-up of the speedometer mounted on the handlebar, showing its position relative to the rider's view.
4.2. Speed/Cadence Sensor Installation
- Attach Sensor: Mount the speed/cadence sensor to the front fork of your bicycle using the provided ties. Ensure it is positioned correctly to align with the wheel magnet.
- Install Wheel Magnet: Attach the wheel magnet to a spoke on your front wheel.
- Adjust Distance: Adjust the position of the sensor and magnet so that they are within 3mm of each other when the wheel rotates. The sensor should be aligned with the magnet.
- Secure Components: Tighten all ties and ensure the sensor and magnet are firmly in place and will not shift during cycling.
Video: This video demonstrates the installation process for a bicycle speedometer and its associated speed/cadence sensor, including mounting the main unit, attaching the wireless transmitter to the fork, and positioning the wheel magnet.
Video: This video provides a general guide on installing and using a cycling cadence and speed sensor. While it features a COOSPO branded sensor, the installation principles are similar for most wireless speed/cadence sensors.
5. Operating Instructions
Your Walfront YA100 A bike computer features two main buttons: "SET" and "MODE".
5.1. Power On/Off
- To power on, press and hold the "SET" button.
- The device will automatically enter sleep mode after a period of inactivity and wake up when motion is detected.
5.2. Display Modes
Press the "MODE" button to cycle through different display screens:
- Speedometer (SPD): Current speed (KM/H or M/H).
- Average Speed (AVS): Average speed during the current ride.
- Maximum Speed (MXS): Highest speed recorded during the current ride.
- Distance (DST): Distance covered during the current ride.
- Travel Time (TM): Duration of the current ride.
- Total Distance (ODO): Total accumulated distance.
- Calories (CAL): Estimated calorie consumption.
- Temperature (TEMP): Current ambient temperature.
- Stopwatch: For timing specific intervals.

Image: A detailed view of the speedometer's display, highlighting the various data fields such as speed, calories, and other metrics.
5.3. Settings Adjustment
To enter settings mode, press and hold the "SET" button while the device is on. Use "MODE" to navigate options and "SET" to confirm or adjust values.
- Unit Selection: Choose between kilometers per hour (KM/H) or miles per hour (M/H).
- Wheel Circumference: Input your wheel's circumference for accurate speed and distance readings. Refer to your bicycle's manual or an online calculator for this value.
- Time Setting: Adjust the current time.
- Maintenance Scan: Activate or deactivate the maintenance reminder function.

Image: Comparison of the speedometer's display readability in daylight and with its bright backlight activated for night use.
6. Maintenance
- Cleaning: Wipe the device with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Water Resistance: The device is waterproof (IPX4 rated), suitable for use in rain. However, avoid submerging it in water.
- Battery: The speedometer and sensor each use one CR2032 button cell battery. Replace batteries when the low battery indicator appears on the display. Ensure correct polarity when replacing.
- Storage: Store the device in a cool, dry place when not in use for extended periods.

Image: The Walfront YA100 A Speedometer undergoing a water resistance test, demonstrating its ability to function in wet conditions.
7. Troubleshooting
- No Speed Reading:
- Check battery in sensor and speedometer.
- Ensure sensor and magnet are correctly aligned and within 3mm distance.
- Verify the wheel circumference setting is accurate.
- Display Not Working:
- Check speedometer battery.
- Ensure the device is powered on.
- Inaccurate Readings:
- Re-check wheel circumference setting.
- Ensure sensor and magnet alignment is precise.
8. Specifications
| Feature | Detail |
|---|---|
| Model | YA100 A |
| Material | ABS |
| Display Size | 2.8 Inches |
| Display Type | LCD |
| Power Supply (Sensor) | 1 x CR2032 button cell 380mAh (built-in) |
| Power Supply (Speedometer) | 1 x CR2032 button cell 380mAh (built-in) |
| Functions | SPD, AVS, MXS, DST, TM, CAL, TEMP, Stopwatch, Maintenance Scan |
| Waterproof Rating | IPX4 |
| Item Weight | 150 g |
| Parcel Dimensions | 14.7 x 8.3 x 5.1 cm |

Image: The Walfront YA100 A Speedometer displaying its physical dimensions for reference.
9. Warranty and Support
For warranty information and customer support, please refer to the product packaging or contact your retailer. Keep your purchase receipt as proof of purchase.





