1. Introduction
This manual provides essential instructions for the installation, operation, and maintenance of your Varstrom 125XVH Electric Bike Hub Motor Conversion Kit. Designed for riders seeking exceptional efficiency, power, and reliability, the 125XVH hub motor offers a powerful upgrade for various bicycle types. Please read this manual thoroughly before installation and use to ensure safe and optimal performance.
Figure 1: Varstrom 125XVH Hub Motor Conversion Kit components, including the motor wheel, display, controller, and various accessories.
2. Safety Warnings
- Fire Risk: Always follow the instruction manual strictly for charging and storage of the battery to prevent potential fire hazards.
- Ensure all electrical connections are secure and waterproofed where necessary, especially for outdoor use.
- Do not attempt to modify the motor or controller, as this may void the warranty and create safety risks.
- Always wear appropriate safety gear, including a helmet, when riding an electric bicycle.
- Regularly inspect your e-bike for any loose parts, damaged wiring, or unusual noises.
3. Product Specifications
Figure 2: Overview of Varstrom 125XVH Hub Motor performance specifications for 500W and 750W versions.
Motor Specifications
Figure 3: Detailed dimensions and technical specifications for the Varstrom 125XVH Hub Motor.
| Attribute | 500W Version (125RX) | 750W Version (125RX-750) |
|---|---|---|
| Brand | Varstrom | |
| Model | 125XVH | |
| Type | Gear Drive Brushless Motor, Rear Hub Motor | |
| Rated Power | 500W | 750W |
| Peak Power | 864W | 1056W |
| Rated Voltage | 48V | |
| Max Speed | 45-50 KM/H | 55-60 KM/H |
| Max Torque | 65Nm | 80Nm |
| Spoke Hole | 36H * 12G | |
| Brake Type | Disc Brake / V Brake | |
| Cassette Type | ≤10-Speed | |
| Efficiency | > 78% | |
| Noise Grade | <60db (No load noise) | |
| Waterproof Rating | IPX5 | |
| Operation Temperature | -20℃ ~ 45℃ | |
| Controller Limited Current | 18±1 A | 22±1 A |
| Controller Rated Current | 9±1 A | 11±1 A |
| Under-Voltage Protection | 39±1 V | |
| Over-Voltage Protection | 62.4V | |
4. Compatibility and Selection
Wheel Size Selection
To ensure proper fit and performance, it is crucial to select the correct wheel size for your bicycle. Follow these steps to determine the suitable wheel size:
- Step 1: Find where the tire size is marked on your bike.
- Step 2: Check the label number (example: if it says 26x1.95 as shown).
- Step 3: Determine tire size. Follow step 2 to determine and confirm that your bicycle tires are 26 inches.
Figure 4: Visual guide for selecting the appropriate wheel size (20", 26", 27.5", 29"/700C).
| Feature | 29" / 700C | 27.5" | 26" | 20" |
|---|---|---|---|---|
| Rim Size | 29"/700C | 27.5" | 26" | 20" |
| Rim Diameter | 630mm (24.8") | 600mm (23.6") | 570mm (22.4") | 420mm (16.5") |
| Compatible Tire Width | 700C: 32C-50C Width | 20"/26"/27.5"/29": 1.5"-2.4" Width | ||
Brake Type Compatibility
The Varstrom 125XVH hub motor is compatible with both Disc Brake and V Brake systems. Ensure you select the correct version of the kit (For Dis Brake Version or For V Brake Version) based on your bicycle's brake system.
Figure 5: Illustration of Disc Brake and V Brake compatibility. Note that the Disc Brake type only fits for Disc Brake, while the V Brake type fits for both V Brake and Disc Brake.
User Tip: A user asked if the V brake version can be mounted on a frame with disc brakes. The product information indicates that the "For V Brake Version" is compatible with both V-brake and disc brake setups, while the "For Dis Brake Version" is specific to disc brakes. This suggests flexibility for V-brake kits on disc brake frames, but not vice-versa for disc brake specific kits.
The motor is suitable for rear dropout sizes of 135-145mm. Please measure your bicycle's rear dropout size to ensure compatibility.
5. Installation Guide
This section outlines the general steps for installing the Varstrom 125XVH hub motor conversion kit. Professional installation is recommended if you are unfamiliar with bicycle mechanics or electrical systems.
Components Overview
Figure 6: Main components of the conversion kit, including the motor wheel, controller, display, and various sensors/levers.
Wiring Diagram
The kit features waterproof connectors and a "foolproof plug-and-play" connection system, designed to prevent miswiring. Refer to the diagram below for correct component connection.
Figure 7: Detailed wiring diagram showing connections for the controller, motor, display, PAS sensor, brake levers/sensors, throttle, and headlight. Note: The package does not include the taillight.
- Mount the Hub Motor: Replace your bicycle's rear wheel with the Varstrom hub motor wheel. Ensure the rear dropout size is 135-145mm for a secure fit.
- Install Controller Box: Secure the controller box (dimensions: 200mm x 72mm x 49mm) to your bike frame in a protected location.
- Install Display: Mount your chosen display (VD03, EKD01, or VD04) on the handlebars. Ensure it is securely fastened and easily visible.
- Install PAS Sensor: Attach the Pedal Assist System (PAS) sensor to your bike's crank arm.
- Install Brake Levers/Sensors: Replace your existing brake levers with the provided ones, or install the brake sensors if using your original levers.
- Connect Components: Follow the wiring diagram (Figure 7) to connect all components. The waterproof connectors are designed for easy and secure attachment.
- Install Throttle (Optional): Mount the thumb throttle on the handlebars and connect it according to the diagram.
- Install Headlight (Optional): Connect the headlight to the system as shown in the diagram.
- Connect Battery: Connect your 48V battery (not included in all kits) to the controller. Ensure the battery is fully charged before first use.
6. Operating Instructions
Once installed, operating your Varstrom e-bike conversion kit is straightforward. The display unit provides all necessary information and control.
Display Units
The kit offers various display options, each with unique features:
- VD03 Bluetooth Mini Display:
- 1.5" LED Screen, φ22.2mm Holder.
- IP67 Waterproof.
- 0-9 PAS Level.
- Bluetooth Function, English Version.
- Supports "BIKEGO+" APP for remote locking & unlocking.
- Quick-Switch to 25 km/h Street-legal Mode: Hold "Power" and "." buttons together.
Figure 8: VD03 Bluetooth Mini Display, showing its compact size and features.
- EKD01 Bluetooth & Navigation Display:
- 2.4" TFT Screen, φ22.2/25.4mm Holder.
- IP67 Waterproof.
- 0-9 PAS Level.
- Bluetooth Function & Navigation Function.
- Supports "BIKEGO+" APP for remote locking & unlocking.
- Multi-language support: English, Français, Español, Italiano, Deutsch, Polski, Nederlands, Čeština, 中文.
- Quick-Switch to 25 km/h Street-legal Mode: Hold "+" and "-" buttons together.
Figure 9: EKD01 Bluetooth & Navigation Display, highlighting its color screen and advanced features.
- VD04 Bluetooth & Navigation Display:
- 3.5" IPS Screen, φ22.2/25.4/31.8mm Holder.
- IP67 Waterproof.
- 0-9 PAS Level.
- Bluetooth Function & Navigation Function.
- Supports "BIKEGO+" APP for remote locking & unlocking.
- Multi-language support: English, Français, Español, Italiano, Deutsch, Polski, Nederlands, Čeština, 中文.
- Quick-Switch to 25 km/h Street-legal Mode: Hold "+" and "-" buttons together.
Figure 10: VD04 Bluetooth & Navigation Display, showcasing its larger IPS screen and comprehensive data display.
Refer to the specific display's mini-manual for detailed button functions and menu navigation.
7. Maintenance
Proper maintenance ensures the longevity and optimal performance of your Varstrom 125XVH hub motor. The motor features advanced helical gearing and internal design engineered for high-intensity use, offering wear-resistant and long-lasting operation with dramatically reduced maintenance compared to standard spur gears.
- Regular Cleaning: Keep the motor and all components clean from dirt and debris. Use a damp cloth for cleaning; avoid high-pressure water jets directly on electrical components.
- Connection Check: Periodically inspect all electrical connections for tightness and signs of wear. The waterproof connectors are designed for durability but should still be checked.
- Gear Inspection: While the helical nylon gear is designed for durability, occasional inspection for unusual noise or resistance is recommended.
- Brake System: Ensure your brake system (Disc or V Brake) is functioning correctly. Adjust as needed.
- Tire Pressure: Maintain correct tire pressure for your wheel size to ensure efficient motor operation and a comfortable ride.
- Battery Care: Follow the battery manufacturer's instructions for charging, storage, and maintenance. Avoid overcharging or fully discharging the battery.
8. Troubleshooting
This section provides basic troubleshooting steps for common issues. For more complex problems, please contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Motor not engaging/no power assist | Battery low or disconnected; loose electrical connections; PAS sensor issue; display error. | Check battery charge and connection. Inspect all wiring for secure fit. Ensure PAS sensor is correctly installed and functioning. Check display for error codes. |
| Display not turning on | Loose power connection to display; battery issue. | Verify display power cable is securely connected. Check main battery connection and charge level. |
| Unusual noise from motor | Loose components; foreign object; internal gear issue. | Stop riding immediately. Inspect the motor area for any obstructions. If noise persists, contact support. |
| Motor cuts out intermittently | Loose connections; overheating; battery issue. | Check all connections. Allow motor to cool down if it feels hot. Ensure battery is providing consistent power. |
9. User Tips
- When choosing your kit, consider that the "For V Brake Version" offers more flexibility as it can also be used with disc brake frames, whereas the "For Dis Brake Version" is specific to disc brakes.
- For optimal performance and longevity, ensure your bicycle's rear dropout size is within the recommended 135-145mm range.
- Utilize the "BIKEGO+" APP with compatible displays (VD03, EKD01, VD04) for remote locking/unlocking and advanced ride data tracking.
- Take advantage of the quick-switch street-legal mode (25 km/h) on your display for compliance with local regulations.
10. Warranty and Support
The Varstrom 125XVH Hub Motor Conversion Kit comes with a 2-year warranty. For any technical support or issues, please contact our customer service. We have professional technicians in the EU who can provide technical assistance and help resolve problems.
Service Points
Maintenance and service points are available in Poland, France, and the UK. For specific locations or to arrange service, please contact customer support.
Figure 11: Map showing global service locations, including Bafang NL, Bafang DE, Bafang PL, Bafang US, Bafang TIANJING, Bafang JPN, Bafang SUZHOU, and Bafang TAIWAN.
11. Statement of Compliance
Disclaimer
⚠️Please mind potential fire risk and strictly follow the instruction manual for charging and storage.
The product is CE certified, ensuring it meets European safety, health, and environmental protection requirements.
Figure 12: Certificates of compliance, including CE certification.
