TONGSHENG TSDZ2B Torque-Sensor Mid-Drive E-Bike Conversion Kit

36V 250W or 48V 500W Mid-Drive Motor with Integrated Torque Sensor

The TONGSHENG TSDZ2B is a brushless mid-drive motor conversion kit designed for city, touring and everyday electric bicycle builds. Its integrated torque and speed sensing system adjusts pedal assistance according to the rider's input, providing a natural and responsive riding experience.

Available in 36V 250W and 48V 500W configurations, the TSDZ2B features up to 80Nm of torque, an integrated motor design and support for compatible displays, including VLCD5, VLCD6 and 860C.

Designed for bicycles with 68-73mm bottom brackets, this conversion kit offers an option for riders looking to add electric pedal assistance while retaining their existing bicycle frame and drivetrain.

General Details

• Brand: TONGSHENG / PSWPOWER
• Model: TSDZ2B
• Type: Torque-Sensor Mid-Drive Conversion Kit
• Motor Design: Brushless
• Voltage Options: 36V / 48V
• Power Options: 36V 250W / 48V 500W
• Maximum Torque: Up to 80Nm
• Pedal Sensor: Integrated Torque and Speed Sensor
• Motor Position: Mid-Drive
• Bottom Bracket: 68-73mm
• Chainring: 42T configuration specified for 68-73mm bottom brackets
• Shaft Standard: JIS
• Efficiency: ≥80%
• Noise Level: <55dB
• Motor Weight: Approximately 3.6kg
• Protection Rating: IP54 listed; confirm rating for the selected version
• Certification: CE; other listed certifications depend on the specific configuration
• Warranty: 1 year

Torque-Sensor Pedal Assistance

The TSDZ2B uses an integrated torque and speed sensing system to adjust motor assistance in response to pedalling.

Unlike a basic cadence-only system, torque sensing responds to the force applied to the pedals, helping provide a more natural connection between the rider and the motor.

This makes the system suitable for everyday commuting, recreational cycling and touring.

Motor & Performance

The TSDZ2B is available in two configurations:

• 36V 250W: For lower-power builds and applications where local e-bike regulations require a 250W-rated motor.
• 48V 500W: For higher-powered builds where permitted by local regulations.

The supplier advertises speeds of up to 45km/h, but actual performance depends on the selected motor, display settings, wheel size, gearing, battery and riding conditions.

Display Compatibility

The kit supports compatible display options, including:

• VLCD5
• VLCD6
• 860C

Display availability and functions depend on the selected motor configuration and compatible wiring.

The supplier notes that, with an XH18-LCD display, the throttle function may operate only as a power-assist level adjustment, depending on the configuration.

Lighting Support

The system includes a split Y-adapter for compatible front and rear bicycle lights.

• Front Light Output: 6V / 3W
• Rear Light Output: 6V / 3W

Lighting control through the display depends on the selected display and wiring configuration.

Bicycle Compatibility

The TSDZ2B is designed for compatible bicycles with:

• 68mm or 73mm bottom brackets
• JIS-standard mounting compatibility
• Suitable clearance around the bottom bracket and motor housing
• Compatible bicycle drivetrain and electrical components

The standard freewheel configuration is not intended for coaster-brake bicycles. Confirm the correct motor version before ordering if your bicycle uses a coaster brake.

Features

• TONGSHENG TSDZ2B mid-drive motor
• 36V 250W or 48V 500W options
• Integrated torque and speed sensor
• Brushless motor design
• Up to 80Nm maximum torque
• At least 80% stated efficiency
• 42T chainring configuration
• 68-73mm bottom bracket compatibility
• Compatible display options
• 6V / 3W front and rear lighting support
• Optional throttle on compatible configurations
• Optional e-brake components
• IP54 protection rating listed by supplier
• Approximately 3.6kg motor weight
• One-year supplier warranty

Specifications

• Motor Model: TSDZ2B
• Motor Type: Brushless Mid-Drive
• Voltage: 36V / 48V
• Rated Power: 250W / 500W
• Maximum Torque: 80Nm
• Pedal Sensor: Integrated Torque and Speed Sensor
• Reduction Ratio: 41:1, as specified by supplier
• Bottom Bracket: 68-73mm
• Chainring: 42T configuration
• Shaft Standard: JIS
• Efficiency: ≥80%
• Noise Level: <55dB
• Motor Weight: Approximately 3.6kg
• Lighting Output: 6V / 3W
• Protection Rating: IP54 listed; verify selected version
• Warranty: 1 year

Package Includes

The exact contents depend on the selected configuration and may include:

• TONGSHENG TSDZ2B mid-drive motor
• Chainring and mounting components
• Speed sensor and magnet
• Wiring harness and lighting adapter
• Display, if selected
• Throttle, if selected and compatible
• E-brake components, if selected
• Mounting gaskets and installation accessories

Battery is not included unless specifically selected. Check the selected kit configuration for the complete list of included components.

Installation Notes

Before installation, confirm that the motor housing clears the bicycle frame. If contact occurs, suitable mounting gaskets may be required. The supplier specifies additional gaskets for adjusting clearance.

Install the speed sensor securely using cable ties and maintain approximately 10-15mm between the sensor and magnet. Align the sensor arrow with the magnet as instructed.

The motor may not operate when tested without drivetrain load. During startup, avoid applying pressure to the pedals while powering on the display.

The supplier states that the standard kit does not include brake levers or a thumb throttle in certain configurations. Confirm component compatibility before ordering, particularly if using hydraulic brakes or existing electronic controls.

Important Notes

• Choose the correct voltage and power configuration: 36V 250W and 48V 500W versions are not interchangeable without confirming component compatibility.
• Battery sold separately unless specified: Use a battery matched to the selected motor voltage and electrical requirements.
• Road legality: The 500W version and advertised speeds up to 45km/h may exceed standard e-bike limits in some jurisdictions. Check local requirements before riding on public roads.
• Frame compatibility: Check bottom bracket dimensions, motor clearance, drivetrain and brake configuration before purchasing.
• Warranty: The supplier advertises a one-year warranty.