Tongsheng TSDZ2B vs. Bafang BBS02B Smackdown! [REVIEW]

In recent years, electric bike conversion kits have grown in popularity as they allow cyclists to convert their traditional bicycles into powerful, battery-assisted rides. Two of the most notable kits in the mid-drive market are the Tongsheng TSDZ2 and the Bafang BBS02B. Enthusiasts often find themselves torn between the two, as each offers unique advantages and quirks. In this article, we’ll delve into a comprehensive comparison between the Tongsheng TSDZ2 and the Bafang BBS02B, covering everything from the user interface to motor performance.

Introduction to the Kits

When retrofitting a standard bicycle with an electric motor, choosing the right conversion kit is crucial. The mid-drive conversion kits from Tongsheng and Bafang mount the motor near the bike’s bottom bracket, delivering power directly through the chain for efficient performance. Here’s a brief introduction to both kits:

Tongsheng TSDZ2: Known for affordability and simplicity, this kit is ideal for beginners. It uses a torque sensor to provide intuitive pedal assistance, giving riders a smooth and natural ride.

Bafang BBS02B: More powerful and feature-rich, this kit caters to performance enthusiasts. Its cadence-based power delivery makes it a favorite among off-road riders seeking high speed and quick acceleration.

Display and Interface

The display and interface are the primary means of interacting with your electric bike’s system. They show key information like speed, battery life, and power consumption, while also allowing you to customize your ride.

Tongsheng TSDZ2:

  • Features a simple monochrome VLCD5 display.
  • Offers 4 fixed levels of pedal assistance.
  • Includes an ampere consumption limiter for battery management.
  • Lacks battery voltage and motor RPM indicators.
  • Limited settings menu with basic customization options.

Bafang BBS02B:

  • Offers a colorful P850C display.
  • Customizable assistance levels: 3, 5, or 9.
  • Displays motor consumption in watts and has a light sensor.
  • Comprehensive settings menu with many useful options.
  • Includes battery voltage and percentage indicators.

User Experience

The Tongsheng TSDZ2’s VLCD5 display is straightforward and functional, but lacks comprehensive data. The Bafang BBS02B’s P850C display, while feature-rich, can be difficult to read in bright sunlight.

Torque Sensing vs. Cadence Sensing

Torque and cadence sensors are the primary means by which the motor detects how much assistance to provide. A torque sensor measures the force applied to the pedals, while a cadence sensor measures the speed at which you pedal.

Tongsheng TSDZ2

  • Uses a torque sensor for pedal assistance.
  • Provides smooth and natural power delivery based on rider effort.
  • Offers a “bionic legs” sensation for a realistic riding experience.

Bafang BBS02B

  • Uses a cadence sensor to detect pedaling and provide power.
  • Delivers immediate, stronger assistance that leads to “ghost pedaling.”
  • Ideal for those seeking quick acceleration and maximum power.

User Experience

The Tongsheng TSDZ2’s torque sensor gives a more intuitive and natural ride, while the Bafang BBS02B’s cadence sensor is best for riders wanting instant and powerful assistance.

Throttle Behavior

A throttle allows you to engage the motor directly without pedaling, providing a boost of power when needed. Different throttle behaviors can significantly affect your riding experience.

Tongsheng TSDZ2:

  • Throttle has a noticeable delay and loses power when twisted while pedaling.
  • Acts independently of the selected assistance level.
  • Gentle throttle behavior protects the motor and chain but can feel sluggish.

Bafang BBS02B:

  • Instantaneous throttle response delivers full motor potential.
  • Strong throttle response can quickly drain the battery.
  • Ideal for steep climbs where immediate power is needed.

User Experience

The Tongsheng TSDZ2 throttle has a delay that may frustrate users seeking immediate response. The Bafang BBS02B’s throttle is quick and ideal for aggressive riders on steep terrains.

Locking Mechanism and Cabling

A secure motor installation and proper cabling are crucial for safety and ease of use. Both kits use different mechanisms to secure the motor and offer varying cabling complexities.

Tongsheng TSDZ2:

  • Single locking ring mechanism may require glue for stability.
  • Simplified cabling design makes installation straightforward.
  • Lacks 6V light support but can be modified for it.

Bafang BBS02B:

  • Double ring locking mechanism securely holds the motor.
  • More complex cabling offers gear shifting and 6V headlight support.
  • Interface cable splits into 4 before reaching the display.

User Experience

The Tongsheng TSDZ2’s simpler cabling design makes installation easier for beginners, while Bafang’s double ring mechanism ensures a more secure fit.

Performance and Speed

Performance and speed vary based on motor power and sensor type. Mid-drive motors generally deliver more power due to direct chain engagement, and each kit caters to different rider needs.

Tongsheng TSDZ2:

  • Generally slower than the Bafang kit.
  • Smoother torque-based assistance makes it ideal for leisurely rides.
  • More energy-efficient due to moderate power output.

Bafang BBS02B:

  • Faster overall, delivering high power output for quicker acceleration.
  • Cadence-based assistance leads to “ghost pedaling.”
  • Higher speed comes at the cost of increased battery consumption.

User Experience

For a smooth, energy-efficient commute, the Tongsheng TSDZ2 excels with its natural torque-based assistance. For speed enthusiasts, the Bafang BBS02B’s high power and quick acceleration are ideal.


Choosing between the Tongsheng TSDZ2 and Bafang BBS02B depends on your specific needs and preferences. The TSDZ2’s torque sensor provides a smooth, intuitive ride, making it perfect for beginners and relaxed commuting. Meanwhile, the Bafang BBS02B is suited for performance enthusiasts who crave speed and power.

Summary of Key Differences:

Feature Tongsheng TSDZ2 Bafang BBS02B
Display VLCD5 monochrome display P850C colorful display
Assistance Levels 4 fixed levels Customizable: 3, 5, or 9 levels
Ampere Consumption Limiter Yes No
Battery Voltage Display No Yes (Voltage and Percentage)
Torque vs. Cadence Sensor Torque (Smooth, Progressive Assistance) Cadence (Immediate, Powerful Assistance)
Throttle Response Delayed, gentle start Instantaneous, full power
Shift Sensor Support Indirect (through brake sensor) Yes
Locking Mechanism Single ring, may require glue Double ring, secure
Cabling Complexity Simple More complex, includes gear shift and 6V light support
Light Support No (requires modification) Yes (6V light cable included)
Motor Power 250W-500W 500W
Speed Generally slower Faster overall
Natural Ride Feel High (Torque-based, realistic) Medium (Cadence-based, “ghost pedaling”)
Battery Consumption Moderate High
Ideal Use Case Commuting, smooth and energy-efficient rides Off-road, performance, and speed enthusiasts

In the end, the best choice will depend on your riding style and requirements. If you’re looking for a balance between natural riding and intuitive power assistance, the Tongsheng TSDZ2 could be your ideal kit. However, if you’re after raw power and performance, the Bafang BBS02B is your best bet. Both kits have their unique strengths, and regardless of your choice, you’re sure to enjoy the exciting world of ebike commuting.

Feel free to share your experiences and thoughts in the comments below, and don’t forget to hit that Like button and subscribe for more ebike content!

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