Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Varstrom 125XVH Performance Series Wheel Hub Motor Conversion Kit. Please read this manual thoroughly before attempting installation or operation to ensure safe and optimal performance.
⚠ Disclaimer: Please mind potential fire risk and strictly follow the instruction manual for charging and storage.
Key Features
- High Efficiency: >80% energy conversion for longer range and smoother acceleration.
- Helical Gear Design: Superior wear resistance and reduced maintenance compared to basic spur gears. Rugged nylon helical gears distribute force evenly, ensuring reliability under heavy loads.
- IPX5 Waterproof: Fully sealed connectors for enhanced splash and weather resistance. Not recommended for prolonged heavy rain.
- Wide Compatibility: Fits 20", 26", 27.5", 28", 29" wheels (including 700C).
- Quick 25km/h Mode: Street-legal compliance with a simple button combination (EU/UK).
- Powerful Gear Drive Brushless Motor: Available in 500W and 750W options, delivering enhanced power and torque.
Ideal for: Food delivery or Courier Services, Urban commuting & Long-distance touring, Steep hill climbs and off-road adventures.
Package Contents
The Varstrom 125XVH kit includes the following components:
- 1 pc Varstrom 125XVH New Performance Hub Motor Kit (Optional, specific wheel size/power)
- 1 pc Motor Controller
- 1 pc Controller Box (Note: Battery not included)
- 1 pc Display (Optional, specific model)
- 1 pc 1T4 Cable
- 1 set Thumb Throttle
- 1 set PAS Sensor
- 1 set Brake Lever or Brake Sensor (Optional, depending on brake type)
Free Gifts Included:
- 1 pc 36-60V Front Light
- 1 pc 36V 250W Sticker
- 1 set Cable Ties
Setup and Installation
The Varstrom 125XVH kit is designed for DIY-friendly installation with tool-free mounting for most bikes and plug-and-play wiring. No professional help is typically needed.
1. Choose the Correct Wheel Size
Ensure you select the hub motor that matches your bicycle's wheel size. Refer to the tire sidewall for the marked size (e.g., 26x1.95).
How to Choose 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.
| Rim Size | Rim Diameter | Compatible Tire |
|---|---|---|
| 28"/29"/700C | 630mm (24.8") | 700C: 32C-50C Width |
| 27.5" | 600mm (23.6") | 20"/26"/27.5"/28"/29": 1.5"-2.4" Width |
| 26" | 570mm (22.4") | 20"/26"/27.5"/28"/29": 1.5"-2.4" Width |
| 20" | 420mm (16.5") | 20"/26"/27.5"/28"/29": 1.5"-2.4" Width |
2. Brake Type Compatibility
The kit supports both Disc Brake and V-Brake systems. Choose the appropriate brake component (Brake Lever or Brake Sensor) based on your bicycle's existing brake type.
- If your brake is a Mechanical brake, you should choose our Brake Lever.
- If your brake is a Hydraulic brake, you should choose our Brake Sensor. If you don't want to change your brake lever, you can still choose our Brake Sensor.
3. Motor Installation and Dropout Spacing
The rear hub motor is compatible with a dropout spacing of 135-145MM. Ensure your bicycle frame has the correct spacing for proper fitment.
Component Identification (Refer to Wiring Diagram):
- Brake Lever or Brake Sensor (Optional)
- Thumb Throttle
- Display (Optional)
- 1T4 Cable
- Headlight
- Controller & Box
- PAS Sensor
- Rear Hub Motor Wheel (Optional)
- Battery (Optional)
Connect all components according to the wiring diagram. Ensure all connections are secure and waterproof.
Operating Instructions
Display Options and Features
Your kit may include one of the following display models, each offering unique features:
- EKD01 Display: 2.4" TFT screen, Φ22.2/25.4mm holder, Bluetooth function, Navigation function, IP67 waterproof. Supports 9 languages (English, Français, Español, Italiano, Deutsch, Polski, Nederlands, Čeština, 中文). Supports 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, Φ22.2mm holder, Bluetooth function, IP67 waterproof. English version. Supports "BIKEGO+" APP remote locking & unlocking. Quick-switch to 25 km/h street-legal mode by holding "Power" and "-" buttons together.
- VD04 Display: 3.5" IPS screen, Φ22.2/25.4/31.8mm holder, Bluetooth function, Navigation function, IP67 waterproof. Supports 9 languages (English, Français, Español, Italiano, Deutsch, Polski, Nederlands, Čeština, 中文). Supports remote locking & unlocking via "BIKEGO+" APP. Quick-switch to 25 km/h street-legal mode by holding "+" and "-" buttons together.
Quick 25km/h Mode (EU/UK Compliance)
To comply with local regulations in the EU and UK, your display offers a quick-switch function to limit the maximum speed to 25 km/h. Refer to your specific display model's instructions above for the button combination to activate/deactivate this mode.
Maintenance
Regular maintenance ensures the longevity and optimal performance of your Varstrom 125XVH kit.
- Motor: The helical gear design offers superior wear resistance, reducing the need for frequent maintenance. Periodically check for any unusual noises or vibrations.
- Connections: Despite the IPX5 waterproof rating, regularly inspect all electrical connections for signs of wear, corrosion, or damage. Ensure they are securely fastened.
- Cleaning: Clean the motor and other components with a damp cloth. Avoid high-pressure washing directly on electrical parts.
- Battery (if applicable): Follow the battery manufacturer's instructions for charging, storage, and maintenance. Always charge in a well-ventilated area and avoid extreme temperatures.
- General Bike Maintenance: Continue with regular bicycle maintenance, including checking tire pressure, brake function, chain lubrication, and bolt tightness.
Troubleshooting
This section addresses common issues you might encounter. For more complex problems, please contact Varstrom 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 battery is charged and properly connected.
- Verify that the PAS sensor is correctly installed and aligned, and that the magnets are passing close enough to the sensor.
- If using a throttle, check its connection and function.
- Display Not Turning On/Showing Errors:
- Check the display's connection to the controller.
- Ensure the main power to the system is on.
- Consult the display's specific manual (if provided separately) for error codes.
- Reduced Power or Range:
- Check battery charge level and overall health.
- Ensure tire pressure is correct.
- Verify that the motor is not overheating (though unlikely with normal use).
- Loose Connections:
- Periodically check all connectors for tightness. The waterproof connectors are designed to be secure, but vibrations can sometimes loosen them.
Specifications
Detailed specifications for the Varstrom 125XVH Hub Motor and Controller:
| Attribute | 125XVH-500W | 125XVH-750W |
|---|---|---|
| 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 (W) | 500W | 750W |
| Peak Power (W) | 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 (dB) | <60dB | <60dB |
| Waterproof Grade | IPX5 | IPX5 |
| Operation Temperature | -20℃ - 45℃ | -20℃ - 45℃ |
| Compatible Dropout Spacing | 135-145MM (Rear Drop Out Size) | |
| Reduction Ratio | 5.33 | |
| Max Current of Controller | 18±1A | 22±1A |
| Controller Low-Voltage Protection | 39±1V | |
| Controller Over-Voltage Protection | 62.4V | |
| Controller Size | 109.9*60.8*30mm | 116.9*64*31.3mm |
Warranty & Support
Varstrom is committed to providing reliable products and excellent customer service.
Warranty Periods:
- Motor & Battery: 12 months quality warranty.
- Accessories & Parts: 30-day warranty for quality assurance.
Under Warranty:
- If there is any quality problem within 6 months (Based on Delivery Date), all warranty costs (repair cost, material cost, shipping cost, etc) are responsible by the seller.
- If there is any quality problem more than 6 months, not more than 12 months (Based on Delivery Date), the repair cost and material cost are responsible by the seller, the shipping cost is responsible by the buyer.
Out of Warranty:
If the warranty period is exceeded, for products from our store, we can continue to provide after-sales service, but the cost will be responsible by the buyer. The exact cost depends on the specific issue.
Local Expertise: Our network of certified service centers across the EU and UK ensures prompt repairs and support. For assistance, please contact Varstrom customer service.
User Tips
- Power Connector: The kit typically uses an XT60 plug for the main power connection. Ensure your battery is compatible or acquire an appropriate adapter if needed.
- Cable Management: Use the provided cable ties to neatly secure all wiring, preventing snags and damage during rides.
- Display Protection: While displays are IP67 waterproof, consider adding a screen protector for scratch resistance, especially for the larger IPS screens.
- App Integration: Utilize the "BIKEGO+" app for remote locking/unlocking and advanced ride data tracking if your display supports it.
