1. Acabatview
The Varstrom Tong-Sheng 48V 750W Mid Drive E-Bike Conversion Kit transforms your standard bicycle into a high-performance electric bike. Designed for versatility, this kit provides powerful assistance for various terrains, from city commuting to challenging mountain trails. Its integrated torque sensor ensures a natural and responsive riding experience, adapting motor assistance to your pedaling force.
This kit is compatible with most standard bikes featuring a 68-73mm bottom bracket and 34-36mm inner diameter, making it a DIY-friendly solution for e-bike enthusiasts.
Video: Tong-Sheng Mid Drive Motor Kit OverviewAquest vídeo ofereix una visió generalview of the Tong-Sheng mid-drive motor kit and its capabilities.
2. Configuració i instal·lació
Before beginning installation, ensure your bicycle is clean and stable. Gather all components from the packing list and necessary tools.
2.1. Llista d'embalatge
Your kit includes the following components:
- TSDZ8 48V 750W Mid Drive Motor
- SWM58 Display
- 1T4 Main Wire Harness
- Acelerador del polze
- Plat 44T
- Sensor de velocitat
- Clau anglesa
- Brake Levers (Optional)
- Braços de biela
- Les volanderes

Image: Packing List. This image displays all the components included in the Varstrom Tong-Sheng 48V 750W Mid Drive E-Bike Conversion Kit.
2.2. Passos previs a la instal·lació
- Remove your bike's existing crankset, chainring, and bottom bracket.
- Clean the bottom bracket shell thoroughly.
- Ensure your bike's bottom bracket dimensions are compatible (68-73mm width, 34-36mm inner diameter).

Image: Motor Compatibility and Specifications. This image illustrates the dimensions and compatibility requirements for the mid-drive motor.
2.3. Instal·lació del motor
- Attach the 44T chainring to the mid-drive motor using the provided bolts.
- Carefully slide the motor assembly into the bottom bracket shell of your bike frame.
- Secure the motor using the Y-shaped motor mount bracket on the left side of the bike. Tighten the fixing nut with 40Nm force.
- Install the crank arms onto the motor spindle and secure them.
- Install the chain, ensuring proper tension.
2.4. Instal·lació de components
- Sensor de velocitat: Mount the speed sensor on the rear chainstay, ensuring the magnet on the wheel spoke passes within 10-15mm of the sensor.
- Palanques de fre: Replace your existing brake levers with the provided ones, which include motor inhibitor sensors.
- Acelerador del polze: Install the thumb throttle on your handlebar.
- SWM58 Display: Mount the SWM58 display on your handlebar in a comfortable viewposició d'ingrés.
- Cablejat: Connect all components (motor, display, throttle, brake levers, speed sensor) using the 1T4 main wire harness. Ensure all connections are secure and waterproof. Use zip ties to manage cables neatly along the frame.
- Bateria: Install the battery mount on your bike frame (if applicable) and then slide the battery onto the mount.
Video: BAFANG BBS Mid Drive Motor for eBike - Installation Video. This video demonstrates the detailed installation process for a mid-drive motor kit.
Video: Ebike Conversion Kit Installation. This video provides a general guide on installing an e-bike conversion kit.
3. Instruccions de funcionament
3.1. SWM58 Display Functions
The SWM58 display provides essential information and control over your e-bike system:
- Encès/apagat: Manteniu premut el botó d'engegada per encendre o apagar el sistema.
- Velocitat: Mostra la velocitat actual (km/h o mph).
- Nivell de bateria: Mostra la càrrega restant de la bateria.
- Nivells d'assistència: Adjust pedal-assist levels (3 or 5 levels available) to control motor assistance.
- Trip/ODO: View current trip distance or total odometer reading.
- Codis d'error: Displays error codes if any system malfunctions occur.
- Indicador de fars: Indicates if the headlight is on.
- Brake Indicator: Shows when brakes are engaged.

Image: SWM58 Display. This image details the features and specifications of the SWM58 display unit.
3.2. Modes de conducció
- Mode d'assistència de pedals: The motor provides assistance as you pedal. Adjust the assist level via the SWM58 display.
- Mode d'acceleració: Use the thumb throttle for power on demand, without pedaling.
4. Manteniment
Regular maintenance ensures the longevity and optimal performance of your e-bike conversion kit.
- Cura de la bateria: Carregueu la bateria regularment, fins i tot quan no la feu servir, per mantenir-ne el bon estat. Guardeu la bateria en un lloc fresc i sec. Eviteu descarregar-la completament.
- Motor & Drivetrain: Keep the motor and chainring clean. Lubricate the chain regularly. Check for any loose bolts or connections on the motor and other components.
- Frens: Periodically check brake pads for wear and ensure brake levers are functioning correctly.
- cables: Inspect all cables for wear, damage, or loose connections. Ensure they are securely fastened to the frame.
5. Solució De Problemes
If you encounter issues with your e-bike kit, refer to the SWM58 display for any error codes. Common issues and their potential solutions are listed below:
- El motor no s'engega: Check all cable connections, especially the main power cable and motor sensor. Ensure the battery is charged and properly seated. Verify that the brake levers are not stuck in the engaged position.
- La pantalla no s'encén: Check battery connection and charge level. Inspect the display cable for damage.
- Potència inconsistent: Ensure the speed sensor is correctly aligned with the magnet (10-15mm gap). Check for loose connections in the motor or display wiring.
- Codis d'error: Consult the SWM58 display manual for specific error code meanings and troubleshooting steps.
6. Especificacions
6.1. Especificacions del motor

Image: Motor Compatibility and Specifications. This image provides a visual and tabular breakdown of the motor's technical data.
| Característica | Valor |
|---|---|
| Voltage | 48 V |
| Potència nominal | 750W |
| Max Torque | >120 N.m |
| Velocitat màxima | ~50 km/h |
| Sensor de pedal | Speed and Torque Integrated |
| Eix estàndard | JIS |
| Mida (L*W*H) | 126*170*204mm (4.96*6.69*8.03inch) |
| Pes | 4.8 kg |
| Eficiència | >80% |
| Grau de soroll | <55dB |
| Bike Recommendation | E-Trekking/E-city / E-tour |
6.2. SWM58 Display Specifications

Image: SWM58 Display. This image details the features and specifications of the SWM58 display unit.
| Característica | Valor |
|---|---|
| Pantalla | 3.8 inch High-Brightness Color LCD |
| Dimensions (L*W*H) | 93.4 mm x 56.4 mm x 6.4 mm |
| Unitat de velocitat | KMH/MPH |
| Vol. Operatiutages | 24V, 36V, 48V, 52V |
| Configuració del límit de velocitat | d'0 a 100 km/h |
| Handlebar Mounting Diameter | 31.8mm/25.4mm/22.2mm (Bottom only supports 22.2mm) |
| Nivells d'assistència | 3, 5 |
6.3. Battery Specifications (Optional)

Image: Battery Specification. This image provides detailed specifications for various optional battery configurations.
| Característica | Valor |
|---|---|
| Bateria | 48 V 17.5 Ah |
| Energia | 840 Wh |
| Cèl·lula | Grade A 18650 3500mAh |
| Protecció BMS | 30A |
| Port USB | 5V 1A |
| Temperatura de càrrega | 0-45°C |
| Temperatura de descàrrega | -15-65°C |
| Mida | 368 * 90 * 111 mm |
| Pes | Uns 4 kg |
| Cicle de Vida | > 1000 vegades |
| Compatible Motor Power | 250W 350W 500W 750W 1000W 1200W 1500W |
| Funció de protecció | Protecció contra sobreintensitat, sobrevoltage Protection, Overload Protection, Overcharge Protection, Overdischarge Protection, Temperature Protection, Short Circuit Protection, Cell VoltagEquilibri electrònic |
7. Garantia i assistència
Varstrom products are designed for durability and performance. For warranty information, please refer to the specific warranty card included with your product or visit the official Varstrom weblloc.
For technical support, troubleshooting assistance, or any questions regarding your e-bike conversion kit, please contact Varstrom customer service through the retailer where you purchased the product or via the contact information provided in your product documentation.
També podeu visitar el Varstrom Store on Amazon per obtenir recursos addicionals i informació sobre el producte.