Sigma Sport BC5.12 Wired Bicycle Computer

Introduction

The Sigma Sport BC5.12 is a wired bicycle computer designed for simplicity and ease of use. It provides essential cycling data through a clear, easy-to-read display and features straightforward single-button operation. This manual provides instructions for installation, operation, and maintenance of your BC5.12 bicycle computer.

What's in the Box

Verify that all components are present before beginning installation:

• BC5.12 Computer Unit
• Mounting Base
• Speed Sensor
• Wheel Magnet
• Battery (CR2032)
• Mounting Hardware (zip ties)
• Instruction Manual

Setup and Installation

Proper installation is crucial for accurate data collection. Follow these steps carefully:

1. Install the Mounting Base

Attach the mounting base to your bicycle's handlebar or stem using the provided zip ties. Ensure it is securely fastened and positioned for easy viewing and access to the button.

2. Install the Speed Sensor

Mount the speed sensor to the front fork of your bicycle using the provided zip ties. Position the sensor so that its detection area aligns with the path of the wheel magnet. The distance between the sensor and the magnet should be approximately 2-5 mm.

3. Install the Wheel Magnet

Attach the wheel magnet to a spoke on your front wheel. Adjust its position so it passes directly in front of the speed sensor with the correct gap (2-5 mm) as the wheel rotates. Ensure the magnet is securely tightened to prevent movement during rides.

4. Install the Computer Unit

Twist the BC5.12 computer unit into the mounting base until it clicks securely into place. The unit can be easily removed for security or storage.

Image: The Sigma Sport BC5.12 computer unit installed on a bicycle handlebar, showing the display and single button.

5. Initial Programming (Wheel Size)

After battery installation, the computer will prompt for initial settings. The most critical setting is the wheel size, which ensures accurate speed and distance measurements. Refer to the wheel size chart in the included manual to find the correct circumference for your tire. Use the single button to navigate and select the appropriate value.

Operating Instructions

The BC5.12 features a single-button interface for all operations.

1. Basic Functions

The computer displays 5 core functions:

• Speed: Current riding speed.
• Distance: Trip distance for the current ride.
• Total Distance: Odometer, showing total accumulated distance.
• Clock: Current time.
• Ride Time: Duration of the current ride.

2. Single Button Operation

Press the button briefly to cycle through the available functions. Hold the button down for a few seconds to access settings or reset trip data (refer to the full manual for specific reset procedures).

3. Automatic Start/Stop

The BC5.12 automatically starts recording data when you begin riding and pauses when you stop. This ensures accurate ride time and distance tracking without manual intervention.

4. Auto Scrolling / Fixed Display

You can configure the display to either automatically scroll through all functions or remain fixed on a single function of your choice. This setting can be adjusted in the computer's menu.

Maintenance

To ensure the longevity and performance of your BC5.12:

• Cleaning: Wipe the computer unit and sensor with a damp cloth. Do not use harsh chemicals or abrasive cleaners.
• Water Resistance: The unit is waterproof, but avoid submerging it for extended periods or using high-pressure water jets directly on it.
• Battery Replacement: The BC5.12 uses a CR2032 battery. When the display becomes dim or functions are erratic, replace the battery. Ensure correct polarity when inserting the new battery.
• Storage: If storing the bicycle for an extended period, remove the computer unit from its mount to conserve battery life.

Troubleshooting

If you encounter issues with your BC5.12, consider the following:

• No Speed/Distance Reading: Check the alignment and distance between the speed sensor and the wheel magnet. Ensure the gap is 2-5 mm. Verify the sensor cable is not damaged and is properly connected to the mounting base.
• Incorrect Readings: Confirm that the correct wheel size circumference has been programmed into the computer.
• Display Issues: If the display is dim or blank, replace the battery. If the display is erratic, try removing and reinserting the battery to perform a soft reset.
• Unit Not Turning On: Ensure the battery is correctly installed and has sufficient charge.

For more detailed troubleshooting or persistent issues, please consult the comprehensive manual or contact Sigma Sport customer support.

Specifications

• Model: BC5.12
• Functions: Speed, Distance, Total Distance, Clock, Ride Time
• Display Type: LCD
• Sensor Type: Wired Speed Sensor
• Battery: CR2032 (included)
• Mounting Type: Handlebar Mount
• Human Interface Input: Buttons
• Water Resistance: Yes
• Item Weight: Approximately 0.16 Pounds
• Dimensions (LxWxH): Approximately 7 x 3.75 x 3.5 inches (packaging)

Warranty and Support

Sigma Sport products are designed for quality and reliability. For information regarding product warranty, returns, or technical support, please refer to the official Sigma Sport website or contact their customer service department. Keep your purchase receipt as proof of purchase.