Varstrom 125XVH

Varstrom 125XVH Powerful Hub Motor Kit

Instruction Manual

Model: 125XVH | Brand: Varstrom

1. Introduction

The Varstrom 125XVH Hub Motor Kit is designed to convert standard bicycles into powerful electric bikes, offering high efficiency, robust performance, and reliability. This kit is suitable for various applications, including food delivery, long-distance touring, and daily city commuting.

Varstrom 125XVH Rear Hub Motor Performance Version with key specifications
Overview of the Varstrom 125XVH Rear Hub Motor and its performance specifications.

The 125XVH motor features a precision-engineered helical nylon gear and optimized internal design for enhanced wear resistance and smooth operation, ensuring durability even under high-intensity use. It boasts an efficiency rating of over 78%, converting more battery power into propulsion.

2. Specifications

Below are the detailed specifications for the Varstrom 125XVH Hub Motor Kit:

Feature 48V 500W Version 48V 750W Version
Model125XVH (125RX)125XVH (125RX-750)
TypeGear Drive Brushless Motor
InstallationRear Hub Motor
Rated Power500W750W
Peak Power864W1056W
Rated Voltage48V
Max Speed45-50 KM/H55-60 KM/H
Max Torque65Nm80Nm
Spoke Hole36H * 12G
Brake TypeDisc Brake / V Brake
Cassette Type≤10-Speed
Rated EfficiencyMore than 78%
Noise Grade<60db
WaterproofIPX5
Operation Temperature-20 ℃ ~ 45 ℃
Controller Limited Current18±1 A22±1 A
Controller Rated Current9±1 A11±1 A
Under-Voltage Protection39±1 V
Over-Voltage Protection62.4V
Detailed motor specifications and dimensions for 500W and 750W versions, including dropout size.
Motor dimensions and detailed specifications for both 500W and 750W versions.

3. Components Overview

The Varstrom 125XVH Hub Motor Kit typically includes the following main components:

  • Rear Hub Motor: The core of the e-bike system, available in 500W or 750W versions.
  • Controller & Box: Manages power delivery to the motor.
  • Display (HMI): Choose from VD03 Bluetooth Mini, VD04 Bluetooth & Navigation, or EKD01 Bluetooth & Navigation.
  • PAS Sensor: Pedal Assist System sensor for power assistance while pedaling.
  • Brake Levers or Brake Sensors: For safety and motor cut-off during braking.
  • Thumb Throttle: For manual power control.
  • 1T4 Cable: Main wiring harness connecting components.
  • Headlight: For illumination (optional).
  • Battery: (Optional, not included in all kits) Provides power to the system.
Wiring diagram showing connections for hub motor, controller, display, PAS sensor, brake levers, throttle, headlight, and battery.
Detailed wiring diagram and component identification for the Varstrom 125XVH kit.

The specific components included may vary based on the selected kit version (e.g., Disc Brake or V Brake compatible brake components).

Packing list image for the V Brake version of the Varstrom 125XVH kit.
Example packing list for the V Brake version of the kit.
Packing list image for the Disc Brake version of the Varstrom 125XVH kit.
Example packing list for the Disc Brake version of the kit.

4. Setup and Installation

4.1. Choosing the Suitable Wheel Size

Before installation, ensure you select the correct wheel size for your bicycle. The wheel size is typically marked on your bike's tire sidewall.

  1. Find the label where the tire size is marked on your bike.
  2. Check the label number (e.g., if it says 26x1.95, your tire size is 26 inches).
  3. Determine your tire size based on this marking.
Diagram showing how to find and interpret tire size markings on a bicycle tire.
Guide to identifying your bicycle's wheel size from the tire markings.

4.2. Motor Installation

The Varstrom 125XVH is a rear hub motor. Ensure your bicycle's rear dropout size is compatible, typically between 135-145mm. Install the motor into the rear wheel dropout, securing it firmly according to standard bicycle wheel installation procedures.

4.3. Wiring Connections

Connect all components using the provided 1T4 cable and waterproof connectors. Refer to the wiring diagram for proper connections. The connectors are designed for plug-and-play installation, minimizing the risk of misconnection. Ensure all connections are secure and properly seated.

Wiring diagram showing connections for hub motor, controller, display, PAS sensor, brake levers, throttle, headlight, and battery.
Detailed wiring diagram for connecting all components of the e-bike kit.

5. Operation

The Varstrom 125XVH kit offers various display options, each with unique features and controls:

5.1. VD04 Bluetooth & Navigation Display

  • Screen: 3.5" IPS Screen, offering vibrant colors and wide viewing angles.
  • Holder: Compatible with φ22.2/25.4/31.8mm handlebars.
  • PAS Level: 0-9 levels of pedal assist.
  • Waterproof: IP67 rated.
  • Functions: Bluetooth connectivity and Navigation function.
  • Language Support: English, Français, Español, Italiano, Deutsch, Polski, Nederlands, Cestina, 中文.
  • Remote Locking & Unlocking: Supported via the "BIKEGO+" APP.
  • Quick-Switch to 25 km/h Street-legal Mode: Hold the "+" and "-" buttons together.
Image of the VD04 Bluetooth & Navigation Display showing its features and interface.
Features and interface of the VD04 Bluetooth & Navigation Display.

5.2. EKD01 Bluetooth & Navigation Display

  • Screen: 2.4" TFT Screen.
  • Holder: Compatible with φ22.2/25.4mm handlebars.
  • PAS Level: 0-9 levels of pedal assist.
  • Waterproof: IP67 rated.
  • Functions: Bluetooth connectivity and Navigation function.
  • Language Support: English, Français, Español, Italiano, Deutsch, Polski, Nederlands, Cestina, 中文.
  • Remote Locking & Unlocking: Supported via the "BIKEGO+" APP.
  • Quick-Switch to 25 km/h Street-legal Mode: Hold the "+" and "-" buttons together.
Image of the EKD01 Bluetooth & Navigation Display showing its features and interface.
Features and interface of the EKD01 Bluetooth & Navigation Display.

5.3. VD03 Bluetooth Mini Display

  • Screen: 1.5" LED Screen (Mini Size Version).
  • Holder: Compatible with φ22.2mm handlebars.
  • PAS Level: 0-9 levels of pedal assist.
  • Waterproof: IP67 rated.
  • Functions: Bluetooth connectivity.
  • Language Support: English Version.
  • Remote Locking & Unlocking: Supported via the "BIKEGO+" APP.
  • Quick-Switch to 25 km/h Street-legal Mode: Hold the "Power" and "." buttons together.
Image of the VD03 Bluetooth Mini Display showing its features and interface.
Features and interface of the VD03 Bluetooth Mini Display.

6. Maintenance

Proper maintenance ensures the longevity and optimal performance of your Varstrom 125XVH Hub Motor Kit.

  • Regular Cleaning: Keep the motor and all components clean from dirt and debris.
  • Connection Checks: Periodically inspect all electrical connections for tightness and signs of wear.
  • Water Exposure: While the motor is IPX5 rated (IP67 for displays), prolonged exposure to heavy rain is not recommended. Avoid submerging the motor or components in water.
  • Gear Inspection: The helical nylon gear is designed for durability, but occasional inspection for unusual noises or resistance is advisable.
  • Cable Management: Ensure cables are neatly routed and secured to prevent damage from snagging or rubbing.
Diagram illustrating the advanced helical gearing and internal design of the Varstrom hub motor.
The advanced helical gearing contributes to the motor's durability and reduced maintenance needs.

7. Troubleshooting

If you encounter issues with your Varstrom 125XVH Hub Motor Kit, consider the following basic troubleshooting steps:

  • No Power:
    • Check battery connection and charge level.
    • Ensure all cables are securely connected, especially the 1T4 cable.
    • Verify the display is powered on.
  • Motor Not Engaging:
    • Check PAS sensor alignment and connection.
    • Ensure brake levers/sensors are not engaged, as they cut off motor power.
    • Verify throttle connection and function.
  • Display Not Working:
    • Check display cable connection.
    • Ensure the battery has sufficient power.
  • Unusual Noises:
    • Inspect the motor for any loose parts or obstructions.
    • If persistent, contact support.

For more complex issues, please contact customer support.

8. User Tips

  • Rear Hub Motor: The Varstrom 125XVH is specifically designed as a rear hub motor. Ensure your bicycle frame is compatible with a rear hub motor setup before purchase and installation.
  • App Connectivity: Utilize the "BIKEGO+" APP for remote locking, unlocking, and advanced ride data tracking, especially with VD03, VD04, and EKD01 displays.
  • Street-Legal Mode: Familiarize yourself with the quick-switch function to activate the 25 km/h street-legal mode, which is crucial for compliance in certain regions.

9. Warranty and Support

The Varstrom 125XVH Hub Motor Kit comes with a 2-year warranty.

For any technical support or assistance, please contact Greenergy Europe Store, an official authorized agent for Bafang products. They have professional technicians in the EU who can provide expert guidance and help resolve any issues you may encounter.

Maintain points are available in Poland, France, and the UK for service and repairs.

Map showing global service and warehouse locations for Bafang products, including Europe.
Global service and support network for Bafang products.

Ask a question about this manual

Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.