1. Drosview
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 OverviewMae'r fideo hwn yn rhoi trosolwg cyffredinolview of the Tong-Sheng mid-drive motor kit and its capabilities.
2. Gosod a Gosod
Before beginning installation, ensure your bicycle is clean and stable. Gather all components from the packing list and necessary tools.
2.1. Rhestr Pacio
Your kit includes the following components:
- TSDZ8 48V 750W Mid Drive Motor
- SWM58 Display
- 1T4 Main Wire Harness
- Throttle Bawd
- 44T Cadwyn
- Synhwyrydd Cyflymder
- Wrench
- Brake Levers (Optional)
- Crank Arms
- Golchwyr

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. Camau Cyn Gosod
- 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. Gosod Modur
- 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. Gosod Cydran
- Synhwyrydd Cyflymder: Mount the speed sensor on the rear chainstay, ensuring the magnet on the wheel spoke passes within 10-15mm of the sensor.
- liferi brêc: Replace your existing brake levers with the provided ones, which include motor inhibitor sensors.
- Throttle Bawd: Install the thumb throttle on your handlebar.
- SWM58 Display: Mount the SWM58 display on your handlebar in a comfortable viewing sefyllfa.
- Gwifrau: 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.
- Batri: 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. Cyfarwyddiadau Gweithredu
3.1. SWM58 Display Functions
The SWM58 display provides essential information and control over your e-bike system:
- Pŵer ymlaen / i ffwrdd: Pwyswch a dal y botwm pŵer i droi'r system ymlaen neu i ffwrdd.
- Cyflymder: Displays current speed (KM/H or MPH).
- Lefel Batri: Yn dangos y tâl batri sy'n weddill.
- Lefelau Cymorth: Adjust pedal-assist levels (3 or 5 levels available) to control motor assistance.
- Trip/ODO: View current trip distance or total odometer reading.
- Codau Gwall: Displays error codes if any system malfunctions occur.
- Dangosydd Prif Oleuadau: 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. Moddau Marchogaeth
- Modd Cymorth Pedal: The motor provides assistance as you pedal. Adjust the assist level via the SWM58 display.
- Modd Throttle: Use the thumb throttle for power on demand, without pedaling.
4. cynnal
Regular maintenance ensures the longevity and optimal performance of your e-bike conversion kit.
- Gofal Batri: Charge the battery regularly, even when not in use, to maintain its health. Store the battery in a cool, dry place. Avoid fully discharging the battery.
- 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.
- Breciau: Periodically check brake pads for wear and ensure brake levers are functioning correctly.
- Ceblau: Inspect all cables for wear, damage, or loose connections. Ensure they are securely fastened to the frame.
5. Datrys Problemau
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:
- Modur heb fod yn ymgysylltu: 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.
- Arddangosfa Ddim yn Troi Ymlaen: Check battery connection and charge level. Inspect the display cable for damage.
- Pŵer Anghyson: Ensure the speed sensor is correctly aligned with the magnet (10-15mm gap). Check for loose connections in the motor or display wiring.
- Codau Gwall: Consult the SWM58 display manual for specific error code meanings and troubleshooting steps.
6. manylebau
6.1. Manylebau Modur

Image: Motor Compatibility and Specifications. This image provides a visual and tabular breakdown of the motor's technical data.
| Nodwedd | Gwerth |
|---|---|
| Graddedig Voltage | 48V |
| Pŵer â Gradd | 750W |
| Max Torque | >120N.m |
| Cyflymder Uchaf | ~50km/awr |
| Synhwyrydd Pedal | Speed and Torque Integrated |
| Siafft Safonol | JIS |
| Maint (L*W*H) | 126*170*204mm (4.96*6.69*8.03inch) |
| Pwysau | 4.8kg |
| Effeithlonrwydd | >80% |
| Gradd Sŵn | <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.
| Nodwedd | Gwerth |
|---|---|
| Sgrin | 3.8 inch High-Brightness Color LCD |
| Dimensiynau (L*W*H) | 93.4mm x 56.4mm x 6.4mm |
| Uned Cyflymder | KMH/MPH |
| Vol Gweithredutages | 24V, 36V, 48V, 52V |
| Gosod Terfyn Cyflymder | 0 i 100km/awr |
| Handlebar Mounting Diameter | 31.8mm/25.4mm/22.2mm (Bottom only supports 22.2mm) |
| Lefelau Cynorthwyo | 3, 5 |
6.3. Battery Specifications (Optional)

Image: Battery Specification. This image provides detailed specifications for various optional battery configurations.
| Nodwedd | Gwerth |
|---|---|
| Batri | 48V 17.5Ah |
| Egni | 840Wh |
| Cell | Grade A 18650 3500mAh |
| Amddiffyn BMS | 30A |
| Porth USB | 5V 1A |
| Tymheredd Codi Tâl | 0-45°C |
| Tymheredd Rhyddhau | -15-65°C |
| Maint | 368*90*111mm |
| Pwysau | Tua 4kg |
| Bywyd Beicio | > 1000 o weithiau |
| Compatible Motor Power | 250W 350W 500W 750W 1000W 1200W 1500W |
| Swyddogaeth Diogelu | Gwarchod Overcurrent, Overvoltage Protection, Overload Protection, Overcharge Protection, Overdischarge Protection, Temperature Protection, Short Circuit Protection, Cell Voltage Cydbwyso |
7. Gwarant a Chefnogaeth
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 websafle.
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.
Gallwch hefyd ymweld â'r Varstrom Store on Amazon am adnoddau ychwanegol a gwybodaeth am gynhyrchion.