1. Introduction
Thank you for choosing the Varstrom 125XVH eBike Hub Motor Conversion Kit. This kit is designed to transform your standard bicycle into a powerful and efficient electric bike, suitable for various uses from daily commuting to off-road adventures. This manual provides essential information for the safe installation, operation, and maintenance of your new eBike system. Please read it thoroughly before proceeding with installation or use.
2. Safety Information
⚠️ Please mind potential fire risk and strictly follow the instruction manual for charging and storage of any connected battery. This kit does NOT include a battery.
- Always wear a helmet and appropriate safety gear when riding your eBike.
- Ensure all connections are secure and waterproof before riding, especially in wet conditions.
- Regularly inspect your eBike for any loose parts, damage, or wear.
- Familiarize yourself with local eBike regulations regarding speed and power limits.
- Do not modify the motor or controller in any way not specified in this manual.
3. Package Contents
Your Varstrom 125XVH kit includes the following components:
- 1 x Varstrom 125XVH Hub Motor Wheel (Optional: 20", 26", 27.5", 700C/28"/29" wheel size, 48V 500W or 48V 750W)
- 1 x Motor Controller
- 1 x Controller Box (Note: Battery is NOT included)
- 1 x Display (Optional: VD03 Mini, EKD01, or VD04)
- 1 x 1T4 Cable
- 1 set Thumb Throttle
- 1 set PAS Sensor
- 1 x Brake Lever or Brake Sensor (Optional, depending on selection)
Free Gifts Included:
- 1 x 36-60V Front Light
- 1 x 36V 250W Sticker
- 1 set Cable Ties
4. Specifications
Motor Specifications
| Feature | 48V 500W Model | 48V 750W Model |
|---|---|---|
| Model | 125XVH | 125XVH |
| Version | Performance Version | Performance Version |
| Type | Gear Drive Brushless Motor | Gear Drive Brushless Motor |
| Installation | Rear Hub Motor | Rear Hub Motor |
| Rated Power | 500W | 750W |
| Peak Power | 864W | 1056W |
| Rated Voltage | 48V | 48V |
| Max Speed | 45-50KM/h | 55-60KM/h |
| Max Torque | 65N.m | 80N.m |
| Spoke Hole | 36H * 12G | 36H * 12G |
| Brake Type | Disc Brake / V Brake | Disc Brake / V Brake |
| Cassette Type | ≤10-Speed | ≤10-Speed |
| Efficiency | >80% | >80% |
| Noise Grade | <60dB | <60dB |
| Waterproof | IPX5 | IPX5 |
| Operation Temperature | -20℃ - 45℃ | -20℃ - 45℃ |
Controller Specifications
| Feature | 48V 500W Controller | 48V 750W Controller |
|---|---|---|
| DC Rated Voltage | 48V | 48V |
| Limit Current | 18±1A | 22±1A |
| Under-Voltage Protection | 39±1V | 39±1V |
| Over-Voltage Protection | 62.4V | 62.4V |
| Size | 109.9*60.8*30mm | 116.9*64*31.3mm |
General Specifications
- Compatible Dropout Spacing: 135-145MM (Rear Drop Out Size)
- Construction: Helical Gears drive
- Waterproof Grade: IP X5
- Certification: CE
5. Setup Guide
5.1 Choosing the Correct Wheel Size
The Varstrom 125XVH kit is compatible with various wheel sizes. To choose the correct wheel, check the label on your current bicycle tire. It will typically show a size like "26 x 1.95".
| How to Choose? | 28" / 29" / 700C | 27.5" | 26" | 20" |
|---|---|---|---|---|
| Rim Size | 28"/29"/700C | 27.5" | 26" | 20" |
| Rim Diameter | 630mm (24.8") | 600mm (23.6") | 570mm (22.4") | 420mm (16.5") |
| Compatible Tire | 700C: 32C-50C Width | 20"/26"/27.5"/28"/29": 1.5"-2.4" Width |
5.2 Brake Type Compatibility
The Varstrom 125XVH hub motor supports both V-Brake and Disc Brake systems. Ensure your bicycle's frame is compatible with the chosen brake type.
When selecting your brake components:
- If your bike uses mechanical brakes, you can choose our Brake Lever option.
- If your bike uses hydraulic brakes, or if you prefer to keep your existing brake levers, you should choose our Brake Sensor option.
5.3 Installation Overview and Wiring Diagram
The Varstrom 125XVH kit features plug-and-play wiring with color-coded connectors for easy installation. No professional help is typically needed.
Installation Steps (General):
- Mount the Hub Motor: Replace your bicycle's rear wheel with the Varstrom hub motor wheel. Ensure it fits within the 135-145MM rear dropout spacing.
- Install Controller Box: Secure the controller box to your bike frame in a suitable location.
- Install Display: Mount the chosen display (VD03 Mini, EKD01, or VD04) on your handlebars.
- Install Throttle and PAS Sensor: Attach the thumb throttle to the handlebars and the PAS (Pedal Assist System) sensor to the crank arm.
- Install Brake Components: Install either the brake levers or brake sensors as per your bike's brake system.
- Connect Wiring: Use the provided 1T4 cable and other connectors to link all components according to the wiring diagram. Ensure all connections are firm and waterproof.
- Install Headlight: Connect the provided 36-60V front light.
- Secure Cables: Use the included cable ties to neatly secure all wiring along the bike frame, preventing interference with moving parts.
6. Operating Instructions
6.1 Display Options and Features
Your kit may include one of three display models, each offering unique features:
- EKD01 Display: 2.4" TFT screen, Ø22.2/25.4mm holder, IP67 waterproof. Supports 9 languages, Bluetooth, and navigation functions. Features remote locking/unlocking via "BIKEGO+" APP. Quick-switch to 25 km/h street-legal mode by holding "+" and "-" buttons together.
- VD03 Mini Display: 1.5" LED screen, Ø22.2mm holder, IP67 waterproof. Features Bluetooth and App support for remote locking/unlocking. Quick-switch to 25 km/h street-legal mode by holding "Power" and "-" buttons together.
- VD04 Display: 3.5" IPS screen, Ø22.2/25.4/31.8mm holder, IP67 waterproof. Supports 9 languages, Bluetooth, and navigation functions. Features remote locking/unlocking via "BIKEGO+" APP. Quick-switch to 25 km/h street-legal mode by holding "+" and "-" buttons together.
6.2 Riding Modes
The Varstrom 125XVH kit supports multiple riding modes:
- Electric Bike Mode: Full electric power, controlled by the throttle.
- Pedal Assisted Mode (PAS): Motor provides assistance based on your pedaling input, detected by the PAS sensor. The level of assistance can usually be adjusted via the display.
- Walk Assisted Mode: Provides low-speed assistance for walking the bike, typically activated by a specific button on the display or controller.
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Varstrom eBike kit.
- Cleanliness: Keep the motor, controller, and display clean. Use a damp cloth to wipe surfaces. Avoid high-pressure washing directly on electrical components.
- Connections: Periodically check all electrical connections for tightness and signs of corrosion. Ensure waterproof seals are intact.
- Gears: The helical nylon gears are designed for wear resistance. However, regular inspection for unusual noises or resistance is recommended.
- Brakes: Ensure your brakes are functioning correctly. Adjust or replace brake pads as needed.
- Tires: Maintain correct tire pressure and inspect for wear or damage.
- Storage: Store your eBike in a dry, cool place away from direct sunlight. If using a separate battery, follow its specific storage and charging instructions.
8. Troubleshooting
This section provides general troubleshooting tips for common issues. For more complex problems, please contact customer support.
- Motor Not Engaging: Check all electrical connections, especially the main power cable from the battery to the controller, and the motor cable. Ensure the display is powered on and showing no error codes. Verify the PAS sensor is correctly installed and aligned.
- Display Not Turning On: Check the battery connection and ensure the battery is charged. Inspect the display cable for damage.
- Loss of Power/Intermittent Operation: This could indicate a loose connection, low battery charge, or an issue with the PAS sensor or throttle. Check all connections and battery level.
- Unusual Noises from Motor: Stop riding immediately. Inspect the motor for any obstructions or signs of internal damage. Contact support if the noise persists.
- Brake Cut-off Not Working: Ensure the brake levers/sensors are correctly installed and connected to the controller.
9. User Tips
- Battery Compatibility: Please note that the Varstrom 125XVH kit does NOT include a battery. You will need to purchase a compatible 48V eBike battery separately. Ensure the battery's connector matches the controller's input.
- Street-Legal Mode: For regions with 25 km/h speed limits, utilize the quick-switch function on your display (holding "+" and "-" or "Power" and "-" buttons) to comply with local regulations.
- App Connectivity: If your display supports Bluetooth and the "BIKEGO+" APP, download the app to access remote locking/unlocking features and advanced ride data tracking.
- Cable Management: After installation, take time to neatly route and secure all cables using the provided ties. This prevents snagging, wear, and improves the overall aesthetic of your eBike.
10. Warranty and Support
Varstrom is committed to providing high-quality products and excellent customer service.
Warranty Periods:
- Motor & Battery (if purchased from Varstrom): 12 months quality warranty.
- Accessories & Parts: 30-day warranty for quality assurance.
Under Warranty:
- If any quality problem occurs within 6 months (based on Delivery Date), all warranty costs (repair cost, material cost, shipping cost, etc.) are covered by the seller.
- If a quality problem occurs more than 6 months but not more than 12 months, the repair cost and material cost are covered by the seller, but the shipping cost is the responsibility of the buyer.
Out of Warranty:
- If the warranty period is exceeded, we can continue to provide after-sales service, but the cost will be the responsibility of the buyer. The exact cost depends on the specific issue.
Customer Support:
For technical assistance, warranty claims, or any questions regarding your Varstrom 125XVH kit, please contact our customer support team. Our network of certified service centers across the EU and UK ensures prompt repairs and support.