Bafang 36V 500W Mid-Drive Motor with C961 Display User Manual

1. Introduction

This user manual provides comprehensive instructions for the installation, operation, and maintenance of your Bafang 36V 500W Mid-Drive Motor and C961 Display. This product is designed to convert a standard bicycle into an electric bicycle, offering enhanced power assistance. Please read this manual thoroughly before attempting any installation or operation to ensure safe and correct usage.

2. Safety Information

Always prioritize safety when working with electrical components and bicycles. Improper installation or use can lead to serious injury or damage to the product. It is highly recommended that installation be performed by a qualified bicycle mechanic if you are not confident in your mechanical abilities.

• Ensure the bicycle is stable and secured before beginning any work.
• Disconnect the battery (not included) before performing any installation or maintenance.
• Wear appropriate safety gear, including gloves and eye protection.
• Do not modify the motor or display components.
• This conversion kit is not suggested for installation onto a carbon fiber frame. Using it on a carbon fiber frame may cause damage to the frame.
• Ensure all connections are secure and waterproofed where necessary.
• Keep children and pets away from the work area.

3. Package Contents

The package for this product includes the following components:

• 1 x Bafang 36V 500W Mid-Drive Motor
• 1 x C961 Display Unit

Please note: This package contains only the motor and display. It does not include any other bike assembly parts such as battery, charger, chainring, cranks, speed sensor, brake levers, or mounting hardware. These accessories must be purchased separately to complete the e-bike conversion.

Image 3.1: Contents of the Bafang motor and C961 display package.

4. Product Overview

The Bafang 36V 500W Mid-Drive Motor is a powerful and efficient unit designed to integrate seamlessly with your bicycle's bottom bracket. The C961 Display provides essential ride information and control over the motor's functions.

4.1 Motor Specifications

Image 4.1: Key specifications of the Bafang 36V 500W Mid-Drive Motor.

The motor features:

• Rated Power: 36V 500W
• Max. Speed: 25 KM/H (Kilometers per Hour)
• Max. Torque: 100 NM (Newton Meters)
• Weight: 4.3 KG (Kilograms)
• Capable of assisting on slopes up to 30 degrees.
• High efficiency, typically greater than 80%.

4.2 C961 Display Overview

The C961 Display is your interface for controlling and monitoring your e-bike system. It features a clear screen and intuitive button controls.

Image 4.2: Annotated view of the C961 Display interface.

Key display readouts and features include:

• Battery Level: Indicates remaining battery charge.
• Speed: Current riding speed (Km/h or Mile/h).
• Unit: Displays the selected unit for speed and distance.
• Distance Unit: Displays the selected unit for distance.
• Mode: Current riding mode.
• Level: Current Pedal Assist System (PAS) level.
• Walking Mode: Icon indicating walking assist is active.
• ODO (Odometer): Total distance traveled.
• TRIP: Distance traveled during the current trip.
• Time: Duration of the current trip.

Image 4.3: The C961 Display features an IP65 waterproof rating.

The C961 display housing is made of ABS material, and the display window is made of acrylic white transparent material. It features an IP65 waterproof rating, ensuring durability in various weather conditions. The ambient temperature range for the housing is from -20°C to 80°C.

5. Setup and Installation

Proper installation is crucial for the performance and safety of your e-bike conversion. This section provides guidance on compatibility and the general installation process. Remember that additional accessories (battery, charger, chainring, cranks, etc.) are required and not included.

5.1 Compatibility Check

Before installation, verify that your bicycle frame is compatible with the Bafang mid-drive motor. The motor is suitable for lower bottom brackets with lengths between 68-73mm and inner diameters of 34-36mm, adhering to JIS norms.

Image 5.1: Essential compatibility checks for your bicycle frame.

• Bottom Bracket Length: Ensure your bike has a 68mm bottom bracket (compatible with 68-73mm).
• Bottom Bracket Inner Diameter: Verify the inner diameter is approximately 33.5mm (compatible with 34-36mm).
• Chainstay Clearance: Make sure the sprocket will not hit the chainstay of your bike.
• Frame Material: It is not suggested to install this conversion kit onto a carbon fiber frame.

5.2 Motor Installation Overview

The Bafang mid-drive motor replaces your bicycle's existing bottom bracket and crankset. The process involves disassembling the original components and installing the motor with its associated parts.

Image 5.2: Exploded view of Bafang motor installation components.

Typical components involved in the motor installation include:

• Mid Motor
• Bottom bracket (part of the motor assembly)
• Fixed bracket
• M33 aluminum nut
• M33-PH nut
• Chainring
• Chain guard
• Left crank
• Right crank
• Various screws (e.g., 5-M5*12 screw, 5-ST3.9*6 screw)

If this is your first time assembling an e-bike, it is strongly recommended to consult a store professional or a qualified mechanic for assistance to ensure proper and safe installation.

5.3 C961 Display Installation

The C961 display mounts on your handlebars. Ensure there is sufficient space and that the display is positioned for easy viewing and access to controls.

Image 5.3: Dimensions of the C961 Display and its control pad.

The display unit has dimensions of approximately 105mm (width) x 58mm (height). The handlebar clamp diameter is compatible with 21-31mm handlebars. The separate control pad has a clamp diameter of 22.2mm.

6. Operating Instructions

Once the motor and display are correctly installed and connected to a compatible battery (not included), you can begin operating your e-bike.

6.1 Powering On/Off

To power on the system, press and hold the power button on the C961 display's control pad. To power off, press and hold the power button again.

6.2 Adjusting Pedal Assist Levels (PAS)

The C961 display allows you to select different levels of pedal assistance. Use the '+' and '-' buttons on the control pad to cycle through the PAS levels. The display supports various settings, including 0-3, 0-5, or 0-9 assist levels, depending on the system configuration. A higher number indicates more motor assistance.

6.3 Backlight Brightness Adjustment

The display's backlight brightness can be adjusted from level 1 to 8. The display can also automatically adjust brightness based on ambient light conditions for optimal visibility.

6.4 Display Information

The C961 display provides real-time information about your ride:

• Speed: Shows your current speed.
• Distance: Toggle between Trip distance (current ride) and Odometer (total distance).
• Battery Level: Indicates the remaining charge of your e-bike battery.
• Assist Level: Displays the currently selected pedal assist level.

6.5 Walking Mode

Some configurations of the C961 display may include a walking assist mode, which provides low-speed assistance for pushing the bike. Refer to your specific display's full manual for activation details if this feature is present.

7. Maintenance

Regular maintenance ensures the longevity and optimal performance of your Bafang motor and C961 display.

• Cleaning: Wipe the motor and display with a damp cloth. Avoid using high-pressure water jets directly on electrical components. The C961 display has an IP65 waterproof rating, meaning it is protected against dust and low-pressure water jets, but it is not designed for submersion.
• Connections: Periodically check all electrical connections for tightness and corrosion. Ensure they are clean and dry.
• Motor Mount: Verify that the motor is securely mounted to the bottom bracket and that all bolts are tightened to the manufacturer's specifications.
• Cables: Inspect cables for any signs of wear, fraying, or damage. Replace damaged cables immediately.
• Storage: When storing the e-bike for extended periods, especially in cold conditions, it is advisable to remove the battery (if applicable) and store it according to its manufacturer's instructions.

8. Troubleshooting

This section addresses common issues you might encounter. For more complex problems, consult a professional e-bike mechanic.

If you encounter issues not listed here or if the suggested solutions do not resolve the problem, please contact the seller or a certified e-bike technician for further assistance.

9. Specifications

Detailed specifications for the Bafang 36V 500W Mid-Drive Motor and C961 Display.

10. Warranty and Support

This product is subject to the standard return policy, which typically allows for a refund or replacement within 30 days of purchase. For specific warranty details, claims, or technical support, please refer to the seller, E-mangue, or the official Bafang support channels.

For any questions regarding compatibility, installation, or operation, it is recommended to contact the seller or a professional e-bike technician.