BAFANG BBS02B 750W 48V Mid-Drive E-Bike Conversion Kit

High-Torque Mid-Drive Power for Custom E-Bike Builds

The BAFANG BBS02B 750W mid-drive motor kit is a powerful e-bike conversion system designed for riders looking to transform a compatible bicycle into a capable electric bike.

With 750W rated power and up to 120Nm of maximum torque, the BBS02B provides strong assistance for hills, demanding routes and faster commuting. The central motor position helps maintain a balanced riding setup while delivering power directly through the bicycle drivetrain.

The kit supports Pedal Assist, throttle-powered riding and manual pedalling, giving riders flexibility over how they use their converted bike.

General Details

• Brand: BAFANG
• Motor Model: BBS02 / BBS02B
• BAFANG Model: M315 MM G340.750.C
• Motor Type: Brushless Mid-Drive
• Rated Power: 750W
• Voltage: 48V
• Maximum Torque: 120Nm
• Efficiency: >80%
• PAS Sensor: Speed Sensor
• Water Resistance: IPX5
• Certification: CE
• Reduction Ratio: 1:21.9
• Warranty: 1 year on motor
• Battery: Not included

Bottom Bracket Compatibility

The BAFANG mid-drive system is available for different bottom bracket widths:

• 68–73mm Bottom Bracket: Standard option
• 89–105mm Bottom Bracket: Wide option
• Inner Diameter: Approximately 34–36mm

Before ordering, measure your bicycle's bottom bracket to confirm compatibility.

The motor can be suitable for mountain bikes, road bikes and many city bicycles, provided the frame and bottom bracket meet the required specifications.

Performance

The 750W motor delivers up to 120Nm of torque, providing substantial assistance for climbing hills, off-road riding and faster commuting.

The central motor configuration positions the drive unit around the bottom bracket area, creating a compact and integrated conversion setup.

The system is designed with an efficiency rating above 80% and a reduction ratio of 1:21.9.

The supplied specifications state a maximum speed of approximately 28–34 mph, depending on wheel size, gearing, battery configuration, rider weight and other conditions.

Riding Modes

The conversion system supports multiple ways to ride:

• Pedal Assist: Motor assistance while pedalling
• Throttle: On-demand motor assistance using the supplied thumb throttle
• Manual Pedalling: Ride without motor assistance

This flexibility allows the same bicycle to be used for everyday commuting, longer rides and more demanding terrain.

Battery & Electrical Safety

Battery is NOT included with this kit.

The battery must be purchased separately and should be correctly matched to the 48V motor system.

The supplied system information specifies battery management protection against:

• Overcharging
• Over-discharging
• Short circuits
• Over-current conditions

Use only a compatible battery and electrical components designed for the BAFANG system.

Display Options

A display is available depending on the selected configuration.

Compatible display options listed for this system include:

• BAFANG DPC080
• BAFANG DPC010
• VD03
• VD618
• EKD01

Display functions and compatibility vary by model and CAN communication configuration.

Brake Options

The kit can be supplied with either brake levers or brake sensors, depending on the selected configuration.

Brake Levers

• Designed to replace existing mechanical brake levers
• Integrated motor cutoff function
• Suitable for mechanical brake setups

Brake Sensors

• Can be fitted to existing brake systems
• Suitable for hydraulic or mechanical brakes
• Provides motor cutoff functionality

Please select the appropriate option for your bicycle's existing braking system.

Safety & Features

• 750W rated brushless mid-drive motor
• Up to 120Nm maximum torque
• 48V electrical system
• Central motor positioning
• Pedal Assist functionality
• Thumb throttle included
• Speed sensor included
• CAN communication system
• IPX5 water resistance
• 80% stated efficiency
• CE certified
• 1-year motor warranty
• Suitable for compatible MTB, road and city bike conversions
• Available for 68–73mm and 89–105mm bottom brackets
• Optional display configurations
• Brake cutoff options
• Battery protection through compatible BMS

Specifications

• Motor: BAFANG BBS02 / BBS02B
• Rated Power: 750W
• Voltage: 48V
• Maximum Torque: 120Nm
• Motor Type: Brushless Mid-Drive
• Efficiency: >80%
• Reduction Ratio: 1:21.9
• Bottom Bracket: 68–73mm / 89–105mm
• Inner Diameter: Approx. 34–36mm
• Chainring Options: 36T / 42T / 44T
• PAS Type: Speed Sensor
• Water Resistance: IPX5
• Motor Operating Temperature: -20°C to 45°C
• Display Operating Temperature: -20°C to 80°C
• Warranty: 1 year
• Battery: Not included

Package Includes

Depending on the selected configuration:

• 1 × BAFANG BBS02B Mid-Drive Motor
• 1 × Thumb Throttle
• 1 × Speed Sensor
• 1 × 4-in-1 EB-BUS Cable
• 1 × Pair of Crank Arms
• 1 × Chainwheel
• 1 × Pair of Brake Levers or Brake Sensors
• 1 × Front Light
• 1 × Installation Wrench Set
• 1 × Crank Removal Tool
• 1 × Cable Tie Bundle
• 1 × User Manual
• 1 × Display, if selected

Battery is not included and is sold separately.

Installation & Compatibility

Before purchasing, measure your bicycle's bottom bracket width and inner diameter to ensure compatibility.

For smaller or unusual frames, check that the chainring and motor housing have sufficient clearance from the frame and rear suspension components.

Professional installation is recommended if you are unfamiliar with bicycle drivetrain or electrical systems. After installation, all electrical connections, brake cutoff functions and motor operation should be checked before riding.

Important Notes

This is a 750W, 48V conversion system, and its legal classification and permitted use can vary significantly depending on your country or region. Check local e-bike laws before installation and use on public roads.

The stated maximum speed is a product specification and actual speed will vary according to wheel size, gearing, battery, rider weight, terrain and other factors.

Battery, unless specifically selected as an additional product option, is not included.