1. Introduction
Congratulations on your purchase of the Varstrom 125XVH Electric Bicycle E-bike Conversion Kit. This kit is designed to convert your standard bicycle into a powerful and efficient electric bike, offering enhanced performance and versatility. This manual provides essential information for the safe installation, operation, and maintenance of your new e-bike conversion kit. Please read it thoroughly before proceeding with installation or use.
⚠ Please mind potential fire risk and strictly follow the instruction manual for charging and storage of any connected battery (not included in this kit).
2. Safety Information
Your safety is paramount. Please observe the following safety guidelines:
- Always wear a helmet and appropriate safety gear when riding your e-bike.
- Ensure all components are securely installed and tightened before each ride.
- Familiarize yourself with local e-bike regulations regarding speed and power limits.
- Do not operate the e-bike in conditions beyond its IPX5 waterproof rating (e.g., submerging in water). While IPX5 protects against splashes, prolonged heavy rain is not recommended.
- Regularly inspect brakes, tires, and electrical connections for wear or damage.
- Keep children and pets away from the e-bike during operation and charging.
- Use only compatible batteries and chargers (not included) as per their respective manuals. Improper charging can lead to fire or explosion.
3. Package Contents
The Varstrom 125XVH E-bike Conversion Kit typically includes the following components:
- Pre-built motor wheel with internal controller
- Left PAS sensor (Right sensor option available)
- Brake sensor or brake lever (depending on selection)
- Front light
- Thumb throttle
- Waterproof connectors
- Cable ties and other installation tools
- Optional smart display (VD03/VD04/EKD01, depending on selection)
4. Specifications
Detailed specifications for the Varstrom 125XVH Rear Hub Motor:
| Feature | 500W Version | 750W Version |
|---|---|---|
| Brand | Varstrom | |
| Model | 125XVH | |
| Version | Performance Version | |
| Type | Gear Drive Brushless Motor | |
| Installation | 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 | 65N.m | 80N.m |
| Spoke Hole | 36H * 12G | |
| Brake Type | Disc Brake / V Brake | |
| Cassette Type | ≤10-Speed | |
| Efficiency | > 80% | |
| Noise Grade | <60db | |
| Waterproof | IPX5 | |
| Operation Temperature | -20℃ ~ 45℃ | |
Rear Dropout Size: Compatible with 135-145mm rear dropout sizes.
Wheel Size Options:
- 28" / 29" / 700C: Rim Diameter 630mm (24.8"), Compatible Tire 700C 32C-50C Width
- 27.5": Rim Diameter 600mm (23.6"), Compatible Tire 20"/26"/27.5"/28"/29":1.5"-2.4" Width
- 26": Rim Diameter 570mm (22.4"), Compatible Tire 20"/26"/27.5"/28"/29":1.5"-2.4" Width
- 20": Rim Diameter 420mm (16.5"), Compatible Tire 20"/26"/27.5"/28"/29":1.5"-2.4" Width
5. Setup and Installation
This kit is designed for DIY-friendly installation. Follow these general steps:
- Prepare Your Bicycle: Ensure your bicycle is clean and in good working order. Remove the existing rear wheel.
- Install the Motor Wheel: Mount the Varstrom motor wheel into your bike's rear dropout. Ensure it fits within the 135-145mm dropout size.
- Install PAS Sensor: Attach the Pedal Assist Sensor (PAS) to your bike's bottom bracket area. Ensure it is correctly aligned with the crank.
- Install Brake Sensors/Levers: Replace your existing brake levers with the provided e-bike brake levers or install the brake sensors onto your existing brake system.
- Install Throttle and Display: Mount the thumb throttle and the chosen smart display (VD03, VD04, or EKD01) on your handlebars.
- Connect Components: Use the waterproof connectors to link all components to the internal controller within the motor wheel. Refer to the wiring diagram below for correct connections.
- Install Front Light: Connect the front light to the designated port.
- Secure Wiring: Use the provided cable ties to neatly secure all wiring along your bike frame, preventing interference with moving parts.
- Connect Battery (Not Included): Connect your compatible 48V e-bike battery to the system. Ensure the battery is fully charged before first use.
Component Identification (Refer to Figure 5):
- Brake Lever or Brake Sensor (Optional)
- Thumb Throttle
- Display (Optional)
- 1T4 Cable
- Headlight
- Controller & Box
- PAS Sensor
- Rear Hub Motor Wheel (Optional)
- Battery (Optional)
6. Operating Instructions
Once installed, operating your Varstrom e-bike is straightforward:
- Power On: Turn on your e-bike battery and then press the power button on your smart display.
- Select Assist Level: Use the controls on your display to select your desired pedal assist level (PAS). Higher levels provide more motor assistance.
- Pedal Assist: Begin pedaling, and the motor will engage to assist your ride. The PAS sensor detects your pedaling motion.
- Throttle Control: For immediate power without pedaling, use the thumb throttle.
- Braking: The brake sensors/levers will cut off motor power when activated, ensuring safe stopping.
- Smart Display Functions:
- VD03 Display: 1.5" LCD Screen, φ22.2mm Holder, 9 PAS Level, IP67 Waterproof, Bluetooth Function, Supports English.
- EKD01 Display: 2.4" TFT Screen, φ22.2/25.4mm Holder, 9 PAS Level, IP67 Waterproof, Bluetooth Function, Navigation Function, Supports English, French, Spanish, Italian, German, Polish, Dutch, Czech, Chinese. Supports Remote Locking & Unlocking (On "BIKEGO+" APP). Quick-Switch to 25 km/h Street-legal Mode (Holding "+" and "-" Button Together).
- VD04 Display: 3.5" IPS Screen, φ22.2/25.4/31.8mm Holder, 9 PAS Level, IP67 Waterproof, Bluetooth Function, Navigation Function, Supports English, French, Spanish, Italian, German, Polish, Dutch, Czech, Chinese. Supports Remote Locking & Unlocking (On "BIKEGO+" APP). Quick-Switch to 25 km/h Street-legal Mode (Holding "+" and "-" Button Together).
Quick-Switch to 25 km/h Mode: For legal compliance in certain regions, the EKD01 and VD04 displays allow a quick switch to a 25 km/h speed limit by holding the "+" and "-" buttons together.
7. Maintenance
Regular maintenance will ensure the longevity and optimal performance of your Varstrom e-bike kit:
- Cleanliness: Keep the motor, controller, and electrical connections clean and free from dirt and debris. Use a damp cloth; avoid high-pressure washing directly on electrical components.
- Connections: Periodically check all electrical connections for tightness and corrosion. Ensure waterproof connectors are properly sealed.
- Brakes: Inspect brake pads and rotors/rims regularly. Adjust or replace as needed to maintain effective braking.
- Tires: Maintain correct tire pressure as specified by your bicycle manufacturer. Check for wear and punctures.
- Motor: The helical gear drive is designed for durability. No specific user maintenance is required for the internal motor components.
- Storage: Store your e-bike in a dry, cool place. If storing for extended periods, follow your battery manufacturer's guidelines for optimal battery health.
8. Troubleshooting
Here are some common issues and potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Motor not assisting | Battery low/off, loose connection, PAS sensor misalignment, brake sensor engaged. | Check battery charge and power, inspect all connections, ensure PAS sensor is correctly positioned, check if brake levers are fully released. |
| Display not turning on | Battery off, loose display cable, damaged display. | Ensure battery is on and charged, check display cable connection, contact support if damaged. |
| Unusual noise from motor | Loose spokes, foreign object, internal motor issue. | Check spokes for tightness, inspect for foreign objects, contact support if noise persists. |
| E-bike cuts out intermittently | Loose battery connection, controller overheating, faulty wiring. | Secure battery connection, allow controller to cool down, inspect wiring for damage. |
If you encounter issues not listed here or if solutions do not resolve the problem, please contact Varstrom customer support.
9. User Tips
- Battery Management: To maximize battery life, avoid fully discharging it frequently. Charge it regularly, and if storing for a long time, keep it at around 50-60% charge.
- Smooth Acceleration: Use lower pedal assist levels or gentle throttle input for smoother acceleration, which can extend motor and battery life.
- Gear Shifting: Shift gears on your bicycle as you would with a regular bike to optimize pedaling efficiency and reduce strain on the motor, especially on inclines.
- Regular Checks: Before each ride, quickly check tire pressure, brake function, and ensure all quick releases/axle nuts are tight.
- App Integration: If you have an EKD01 or VD04 display, utilize the "BIKEGO+" app for remote locking/unlocking and ride tracking to enhance your e-bike experience.
10. Warranty and Support
The Varstrom 125XVH Electric Bicycle E-bike Conversion Kit comes with a 12-month warranty from the date of purchase, covering manufacturing defects. Please retain your proof of purchase for warranty claims.
For technical support, warranty inquiries, or replacement parts, please contact the seller or Varstrom customer service through the platform where you purchased the kit. Provide your order number and a detailed description of the issue for faster assistance.
