Varstrom 125XVH Hub Rear Motor Electric Bike Wheel Kits Conversion

1. Safety Information

⚠️ Disclaimer: Please mind potential fire risk and strictly follow the instruction manual for charging and storage.

• Always wear a helmet and appropriate safety gear when riding an e-bike.
• Ensure all connections are secure and properly insulated before operation.
• Do not modify the motor or battery system in any way not specified in this manual.
• Keep the battery away from heat sources, direct sunlight, and flammable materials.
• Do not immerse the motor, battery, or controller in water.
• Regularly check brakes and tire pressure for safe operation.

2. Product Overview

The Varstrom 125XVH Hub Rear Motor Electric Bike Wheel Kit is designed to convert a standard bicycle into a powerful and efficient e-bike. Featuring advanced helical gearing and a robust internal design, this kit offers superior performance and durability.

Key Features:

• High Efficiency: >80% energy conversion for longer range and smoother acceleration.
• Helical Gear Design: Superior wear resistance and reduced maintenance due to rugged nylon helical gears that distribute force evenly.
• IPX5 Waterproof: Fully sealed connectors provide protection against rain, splashes, and heavy use.
• Wide Compatibility: Fits various wheel sizes from 20" to 29" (including 700C).
• Quick 25km/h Mode: Street-legal compliance with a quick button combination (EU/UK).

Intended Use:

This kit is ideal for riders who demand power, efficiency, and durability. It is suitable for:

• Food delivery or courier services.
• Urban commuting and long-distance touring.
• Steep hill climbs and off-road adventures.

3. Specifications

Motor Specifications:

Controller Specifications:

Controller Size:

• 125RX-500W Controller Size: 109.9*60.8*30mm
• 125RX-750W Controller Size: 116.9*64*31.3mm

Battery Specifications (Optional):

Protection Function: Over-current protection, over-voltage protection, overload protection, over-charging protection, over-discharge protection, temperature control protection, short circuit protection, cell voltage balance.

General Specifications:

• Wheel Size: 20/26/27.5/700C (28/29)
• Compatible Dropout Spacing: 135-145MM (Rear Drop Out Size)
• Certification: CE
• Origin: Mainland China

4. Package Contents

Please check the package carefully upon receipt to ensure all components are present and undamaged.

Standard Kit Includes:

• 1 pc Varstrom 125XVH New Performance Hub Motor Kit (Optional wheel size/power)
• 1 pc Motor Controller
• 1 pc Controller Box (Note: Battery is not included in the controller box)
• 1 pc Display (Optional, model varies)
• 1 pc 1T4 Cable
• 1 set Thumb Throttle
• 1 set PAS Sensor
• 1 set Brake Lever or Brake Sensor (Optional, choose based on your bike's brake type)

Free Gifts Included:

• 1 pc 36-60V Front Light
• 1 pc 36V 250W Sticker
• 1 set Cable Ties

5. Installation Instructions

The Varstrom 125XVH kit is designed for DIY-friendly installation with plug-and-play wiring. No professional help is typically needed.

5.1. Pre-Installation Checks:

• Determine Wheel Size: Check the label marked on your bike's tire (e.g., 26x1.95). Refer to the table below for rim size and compatible tire widths.

• Check Dropout Spacing: Ensure your bike's rear dropout spacing is 135-145MM.
• Choose Brake Type:
  • If your bike has mechanical brakes, choose the Brake Lever option.
  • If your bike has hydraulic brakes, choose the Brake Sensor option. You can keep your original brake levers with the brake sensor.

5.2. Wiring Diagram:

Follow the color-coded connectors in the wiring diagram (Figure 5.3) for proper assembly. Ensure all connections are firm and secure.

• 1T4 Cable: Connects the main components to the controller.
• PAS Sensor: Mount on the pedal crank.
• Thumb Throttle: Mount on the handlebar.
• Headlight: Connect to the designated port on the controller.
• Brake Levers/Sensors: Connect to the designated ports.

5.3. Rear Rack Battery Installation (if applicable):

If you have opted for a rear rack battery, follow these steps:

1. Step 1: Secure the rear rack to your bicycle frame.
2. Step 2: Attach the battery mounting plate to the rear rack.
3. Step 3: Slide the battery onto the mounting plate until it clicks securely into place.
4. Step 4: Connect the battery to the controller using the appropriate cables.

6. Operating Instructions

6.1. Display Operation:

Your kit may come with one of the following display models:

Quick-Switch to 25 km/h Street-legal Mode:

• For EKD01 and VD04: Hold the "+" and "-" buttons together.
• For VD03 Mini: Hold the "Power" and "." buttons together.

6.2. Battery Operation:

• Battery Indicator: Press the button on the battery to check the remaining power. The LEDs indicate charge level:
  • 1 Red 0 Green: 0%
  • 1 Red 1 Green: 1%-25%
  • 1 Red 2 Green: 26%-50%
  • 1 Red 3 Green: 51%-75%
  • 1 Red 4 Green: 76%-100%
• Power Switch: Use the "I" (ON) and "O" (OFF) positions to control battery power.
• Taillight Switch: Use the "I" (ON) and "O" (OFF) positions to control the taillight (if integrated with the battery).
• USB Port: Some batteries feature a 5V 1A USB output for charging cell phones or other devices.

6.3. Riding Modes:

• Electric Bike Mode: Use the thumb throttle to control speed without pedaling.
• Pedal Assisted Mode (PAS): The motor provides assistance as you pedal. The level of assistance can be adjusted via the display.
• Walk Assisted Mode: Provides low-speed assistance for walking the bike, typically activated by holding a specific button on the display.

7. Maintenance

• Regular Cleaning: Keep the motor, battery, and controller clean from dirt and debris. Use a damp cloth; avoid high-pressure water jets.
• Connector Care: Ensure all electrical connectors are clean and dry. Although IPX5 waterproof, prolonged heavy rain is not recommended.
• Gear Inspection: The helical gears are designed for wear resistance, but periodic inspection for any unusual noise or resistance is advisable.
• Battery Storage: When not in use for extended periods, store the battery in a cool, dry place, partially charged (around 50-70%). Avoid fully discharging or fully charging for long-term storage.
• Cable Management: Ensure all cables are neatly routed and secured with cable ties to prevent snagging or damage.

8. Troubleshooting

If you encounter any issues with your Varstrom 125XVH kit, please refer to the following common troubleshooting steps:

• No Power to Display/Motor:
  • Check if the battery is charged and properly connected.
  • Ensure the battery's power switch is in the "ON" position.
  • Verify all cable connections, especially the main power cable from the battery to the controller and the 1T4 cable.
• Motor Not Assisting:
  • Check the PAS sensor installation and ensure it's correctly aligned and functioning.
  • Verify the throttle connection.
  • Ensure the display is powered on and not showing any error codes.
  • Check the brake levers/sensors; if they are engaged, the motor will not assist.
• Error Codes on Display: Refer to your specific display model's manual for a list of error codes and their meanings.
• Unusual Noises from Motor: Discontinue use immediately and inspect the motor for any obstructions or damage. Contact support if the issue persists.
• Reduced Range/Power: Ensure the battery is fully charged. Check tire pressure. Consider if riding conditions (e.g., steep hills, heavy loads) are affecting performance.

If these steps do not resolve the issue, please contact Varstrom customer support for further assistance.

9. User Tips

• Optimize Battery Life: For best battery longevity, avoid frequent full discharges and charges. Aim to keep the charge level between 20% and 80% during regular use.
• Regular Checks: Before each ride, quickly check tire pressure, brake function, and ensure all electrical connections are snug.
• App Integration: Utilize the "BIKEGO+" APP (if supported by your display) for remote locking/unlocking and advanced ride data tracking to enhance your riding experience.
• Street-Legal Mode: Remember the quick-switch combination for 25 km/h mode to easily comply with local regulations when riding in urban areas.
• Proper Gear Selection: While the motor provides assistance, using appropriate bicycle gears for terrain and speed will improve efficiency and reduce strain on the motor and battery.

10. Warranty & Support

Varstrom is committed to providing high-quality products and excellent customer service.

Warranty Coverage:

• Motor & Battery: 12 months quality warranty.
• Accessories & Parts: 30-day warranty for quality assurance.

Warranty Service:

Under Warranty:

1. 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.
2. 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 & Support:

Our network of certified service centers across the EU and UK ensures prompt repairs and support. For any inquiries or assistance, please contact Varstrom customer service.