Man removing crankset to install the Bafang BBS01B 250W mid-drive motor on a bicycle

Bafang BBS01B Installation: Your Step-by-Step Guide To E-Bike Conversion

Transform your ordinary bicycle into a powerful e-bike with the Bafang BBS01B mid-drive motor kit. This 250W/350W conversion kit is equipped with a cadence sensor and pedal assist system, making your ride smooth and effortless. With a complete set of components and a simple installation process, you’ll be cruising on your newly electrified bike in no time. This comprehensive guide will walk you through every step, empowering you to enjoy a new level of cycling freedom.

Install Your Bafang BBS01B 250/350W e-bike kit in 6 Simple Steps


Before diving into the installation, ensure you have the following:

  • Bafang BBS01B 250W or 350W mid-drive motor kit (including battery, display, and all necessary components)
  • Compatible bike frame (check for standard 68-73mm bottom bracket width)
  • Essential tools:
    • Wrenches (various sizes)
    • Allen keys (hex wrenches)
    • Crank puller
    • Bottom bracket tool
    • Optional: Bafang-specific tool kit
  • Clean, well-lit workspace

Step 1: Disassemble Existing Components

  1. Pedals: Use a pedal wrench to remove both pedals from the crank arms.
  2. Crank Arms: Carefully remove the crank arms using a crank puller. Refer to the tool’s instructions or online tutorials if needed.
  3. Bottom Bracket: Utilize a bottom bracket tool to remove the existing bottom bracket from the bike frame.

Step 2: Install the Bafang BBS01B Motor

  1. Insert the Motor: Gently slide the BBS01B motor into the vacant bottom bracket shell. Ensure proper alignment and a snug fit. Utilize spacers if necessary to bridge any gaps between the motor and frame.
  2. Secure the Motor: Employ the provided fixing plate, lock washer, and bolts to firmly secure the motor to the frame. Tighten the bolts to the specified torque using a torque wrench to prevent damage.

Step 3: Connect Battery and Wiring

  1. Mount the Battery: Securely attach the battery to the bike frame, typically on the downtube or in a dedicated bag, using the included brackets. Prioritize weight distribution and battery protection when choosing a location.
  2. Connect the Wiring: Route the motor cable along the downtube, securing it with zip ties. Carefully connect the wiring harnesses from the motor to the battery, display, brake levers (if applicable for e-brake cut-offs), and throttle (if included). The BBS01B’s color-coded connectors simplify this process. Double-check each connection against the provided wiring diagram.

Step 4: Install Display and Controls

  1. Mount the Display: Securely attach the display to your handlebars in a position that is easily visible while riding.
  2. Connect Cables: Route the display cable along the handlebar and connect it to the corresponding port on the motor wiring harness. Ensure all cables are neatly organized and secured with zip ties to prevent any interference or damage.

Step 5: Reinstall Crank Arms and Pedals

  1. Install Crank Arms: Slide the crank arms back onto the BBS01B’s spindle, ensuring they are correctly aligned. Tighten them securely using a crank arm tool or wrench.
  2. Reattach Pedals: Screw the pedals back onto the crank arms, tightening them to the manufacturer’s recommended torque.

Step 6: Test and Fine-Tune

  1. Adjust Shifting: After installing the BBS01B, your derailleur might require minor adjustments to ensure smooth and precise gear changes.
  2. Configure Display Settings: Refer to the display manual to personalize settings such as power levels and other features to suit your preferences.
  3. Test Ride and Troubleshooting: Take your newly electrified bike for a short, controlled test ride. Verify that everything functions as expected and address any issues like unusual noises, shifting problems, or motor cut-outs. Consult the troubleshooting guide in the manual or seek online resources for assistance.

Pro Tips for a Successful E-Bike Conversion

Technician installing Bafang BBS01B electric bike motor in workshop

While the BBS01B installation process is straightforward, a few extra tips can ensure a seamless and successful conversion.

  • Video Tutorials: Watch installation videos online to get a visual understanding of the process before you begin.
  • Proper Tools: Invest in a Bafang-specific tool kit or ensure you have all the necessary tools on hand.
  • Torque Wrench: Use a torque wrench to tighten bolts to the correct specifications, avoiding damage to components.
  • Cable Management: Route cables neatly and secure them with zip ties to prevent tangling or damage.
  • Patience: Take your time, follow the instructions carefully, and don’t hesitate to seek help online or from a local bike shop if you encounter any issues.

Maintenance Tips: Keep Your BBS01B Running Smoothly

Proper maintenance is essential for maximizing the lifespan and performance of your Bafang BBS01B. Fortunately, keeping this mid-drive motor in top shape requires minimal effort and just a few simple steps.

  • Regular Inspection: Periodically check all the bolts and connections on your e-bike, especially those securing the motor and battery, to ensure they remain tight and secure.
  • Gearbox Lubrication: Apply a high-quality grease to the motor’s gearboxes every 500-1000 miles to reduce friction and prevent premature wear. This simple task takes only about 20 minutes and can significantly extend the lifespan of your motor.
  • Chain Care: Keep your chain clean and well-lubricated for smooth and efficient pedaling.
  • Tire Pressure: Maintain proper tire pressure for optimal performance, comfort, and range.
  • Battery Care: Follow the manufacturer’s instructions for charging and storing your battery to maximize its lifespan and performance.

Ride Responsibly: Safety and Legal Compliance

Riding an e-bike with the Bafang BBS01B is exhilarating, but responsible riding and safety should always remain your top priorities. Here’s how to ensure your e-bike adventures are both electrifying and safe.

  • Protective Gear: Always wear a helmet and consider additional protective gear like gloves and knee pads.
  • Traffic Laws: Familiarize yourself with local traffic laws and regulations regarding e-bikes, including speed limits and required equipment.
  • Bike Lanes: Use designated bike lanes whenever possible to enhance your safety and visibility.
  • Battery Safety: Handle your battery with care, following the manufacturer’s instructions for charging and storage. Avoid exposing it to extreme temperatures or moisture.
  • E-Bike Classification: Be aware of the e-bike classification system in your region. The Bafang BBS01B is typically classified as a Class 1 or Class 2 e-bike in the United States and a pedelec in Europe, with different speed and power restrictions depending on the classification.

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