1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your BAFANG Mid Drive Kit. Designed for converting standard bicycles into powerful electric bikes, this kit offers robust performance and versatile compatibility.
The BAFANG Mid-drive motor (available in 500W, 750W, and 1000W options) delivers significant torque, making it suitable for various terrains, from urban commutes to off-road adventures. It supports multiple riding modes including Throttle, Pedal Assistance, and Standard Cycling.
This kit is universally designed to fit most bikes with bottom brackets measuring 68-73mm, 100mm, and 120mm lengths, and 33.5-36mm inner diameters, adhering to JIS norms. Please note that 73mm screws are not included and may need to be acquired separately if required for your specific setup.
2. Product Components
Your BAFANG Mid Drive Kit includes the following essential components to facilitate your electric bike conversion:
Figure 2.1: Overview of BAFANG Mid Drive Kit components.
- BAFANG Central Motor: The core mid-drive unit (BBS02B/BBS-HD).
- LCD Display: For monitoring speed, battery level, and other ride data (optional, various models available).
- Brake Levers: With motor inhibitor sensors for safety.
- Thumb Throttle: For effortless control of electric power assistance.
- Chainwheel: Available in various tooth counts (optional).
- Crank Arms: For pedal attachment.
- Speed Sensor and Magnets: For accurate speed measurement.
- Cables: Including the 1T4 EB-Bus cable for connecting components.
- Nuts and Bolts: Various fasteners for installation.
- Instruction Manual: This guide.
- Battery and Charger: (Optional, purchased separately).
- Tools: Includes a wrench, crank removal tool, and bottom bracket remover.
- Headlight: A 6V LED headlight is included for improved visibility.
Figure 2.2: Detailed packing list of the conversion kit.
Figure 2.3: Various battery options and their specifications.
3. Setup and Installation
The BAFANG Mid Drive Kit is designed for straightforward installation. For a visual guide, please refer to the official installation video below. Most installations on standard mountain bikes can be completed in under 30 minutes with basic tools and no specialized mechanical skills.
Video 3.1: Official BAFANG BBS Mid Drive Motor Installation Guide. This video demonstrates the step-by-step process of converting a bicycle with the BAFANG mid-drive kit.
3.1. Compatibility Check
Ensure your bike's bottom bracket is compatible. The kit fits bottom brackets with 68-73mm, 100mm, or 120mm lengths and 33.5-36mm inner diameters (JIS standard). For 73mm bottom brackets, additional screws may be needed. The kit is compatible with disc or V-brake equipped, chain-driven models only. It is not compatible with belt-drive chainrings, coaster bikes, or carbon fiber bikes.
Figure 3.2: Guide to check motor compatibility with your bike's bottom bracket.
Figure 3.3: Available chainring options for 500W/750W and 1000W motors.
3.2. Removing the Crankset
Begin by removing the existing crank arms and chainwheel from your bike's bottom bracket. Use the provided crank removal tool and bottom bracket remover for this step. Ensure all components are clean before proceeding.
3.3. Mid-Drive Motor Installation
Attach the appropriate chainwheel to the BAFANG motor unit. Carefully insert the motor into the bike's bottom bracket. Secure the motor using the Y-shaped motor mount bracket on the left side of the bike, followed by the lock nuts. Tighten all bolts with the provided wrench to ensure a secure fit.
3.4. Display and Controls Mount
Mount the LCD display, thumb throttle, and brake levers onto the handlebars. The brake levers include motor inhibitor sensors that cut off power when activated, enhancing safety. If your bike has hydraulic brakes, brake sensors are available as an option to maintain your original brake system.
Figure 3.4: Different LCD display models and their features.
3.5. Cable Management
Connect all cables from the motor, display, throttle, and brake levers using the 1T4 EB-Bus cable. Use the provided zip ties to neatly organize and secure the cables along the bike frame, ensuring they do not interfere with moving parts.
Figure 3.5: Simplified wiring diagram for the BAFANG Mid Drive Kit.
4. Operation
Once installed, the BAFANG Mid Drive Kit offers three primary modes of operation:
- Throttle Mode: Provides electric power directly via the thumb throttle, allowing for propulsion without pedaling.
- Pedal Assistance Mode (PAS): The motor provides assistance based on your pedaling input, making riding easier and extending range.
- Standard Cycling Mode: The motor is disengaged, and the bike operates as a traditional bicycle, relying solely on pedal power.
The LCD display provides real-time information such as speed, battery level, and selected assistance level, allowing you to monitor your ride effectively.
5. Maintenance
Regular maintenance is crucial to ensure the longevity and optimal performance of your BAFANG Mid Drive Kit. Keep the motor and all electrical connections clean and dry. Periodically check all bolts and fasteners for tightness, especially after initial rides.
Inspect the chain, chainwheel, and crank arms for wear and tear. Lubricate the chain regularly. Ensure the battery is charged according to the manufacturer's guidelines to prolong its lifespan. Avoid exposing electrical components to extreme temperatures or prolonged moisture.
6. Troubleshooting
If you encounter any issues with your BAFANG Mid Drive Kit, consider the following common troubleshooting steps:
- No Power: Check battery connection, ensure the battery is charged, and verify all electrical cables are securely connected.
- Motor Not Engaging: Confirm the display is on and the correct assistance level is selected. Check the speed sensor and magnet alignment. Ensure brake levers are not engaged, as they cut motor power.
- Unusual Noises: Inspect the motor and chainwheel for any obstructions or loose components. Lubricate the chain if it's dry.
- Display Errors: Refer to your specific LCD display manual for error codes and their meanings. Often, re-connecting the display or battery can resolve minor glitches.
For persistent issues or complex problems, please contact BAFANG customer support for assistance.
7. Specifications
| Feature | Detail |
|---|---|
| Brand Name | BAFANG |
| Model Name | BBS02B/BBS-HD |
| Part Number | US JJ DZ 48V/52V Mid Drive Kit |
| Color | Black |
| Material | Aluminum |
| Voltage | 48 Volts (compatible with 52V options) |
| Rated Power | 500W, 750W, 1000W (depending on model) |
| Max Torque | 100/120/160 N.m (depending on model) |
| Max Speed | 38-60 KM/H (depending on model) |
| Suggested Users | Unisex-adult |
| Manufacturer | Bafang Electric (Suzhou) Co., Ltd. |
| Date First Available | October 28, 2024 |
Figure 7.1: Detailed motor specifications for 500W, 750W, and 1000W models.
8. Warranty and Support
BAFANG offers a 30-day return policy and a 365-day repair or replacement warranty for this product. Our expert tech support team, based in the US, is available to assist you with any queries or uncertainties you may encounter.
For support, please follow these steps from your order on Amazon: Click Account & Lists → Orders → Get help with order → (Enter information) → Send e-mail. We are committed to providing exceptional customer care and a hassle-free experience.
