Varstrom VSM01 Mid Drive Motor Kit

1. Introduction

Welcome to the future of your ride! The Varstrom VSM01 is a brand new 2026 mid-drive motor kit, designed to be smarter, stronger, and more versatile than ever. It's the perfect choice to transform your regular bike into a powerful and intuitive electric bike, whether you're commuting, exploring trails, or just enjoying the ride. This motor delivers a smooth, natural, and super-efficient experience.

This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Varstrom VSM01 Mid Drive Motor Kit. Please read it thoroughly before attempting any installation or use.

⚠️ Important Safety Warnings

• Fire Risk: Please mind potential fire risk and strictly follow the instruction manual for charging and storage of your battery (battery not included with this kit).
• Always wear a helmet and appropriate safety gear when riding an e-bike.
• Ensure all connections are secure and waterproofed where necessary.
• Do not modify the motor or controller system, as this may void the warranty and create safety hazards.
• Regularly inspect your e-bike for any signs of wear or damage.

2. Package Contents

Please check the package carefully to ensure all items are present and undamaged:

• 1 x VSM01 48V750W Mid Drive Motor
• 1 x VD41 LCD Display
• 1 x Speed Sensor
• 1 x 44T Chainring with Guard
• 1 x Pair of Cranks (170mm)
• 1 x 1T4 Cable
• 1 x Set of Installation Screws & Spacer
• 1 x Pair of Brake Levers/Sensor (Optional - selected at purchase)

3. Technical Specifications

4. Compatibility

The VSM01 motor kit is designed for broad compatibility with most bicycles. Please verify the following measurements on your bike before installation:

• Bottom Bracket Length: The motor fits standard 68mm-73mm bottom brackets.
• Bottom Bracket Inner Diameter: Must be between 33.5mm-36mm.
• Battery Compatibility: The motor is compatible with 36V and 48V batteries. It is NOT compatible with 52V batteries.

Incompatible Bicycle Types:

• Bicycles with Belt Drive Chainrings.
• Coaster Brake Bicycles.

5. Installation Guide

This section provides a general overview of the installation process. Professional installation is recommended if you are unfamiliar with bicycle mechanics or electrical systems.

5.1 Choosing Your Brake System

The kit offers two options for brake integration:

• Brake Lever: Recommended if your bike has mechanical brakes or if you wish to replace your existing brake levers. These levers integrate a motor cut-off switch.
• Brake Sensor: Recommended if your bike has hydraulic brakes and you wish to retain your original brake levers. The sensor attaches to your existing brake lever to provide motor cut-off functionality.

5.2 General Installation Steps

1. Prepare Your Bicycle: Remove the existing bottom bracket, cranks, and chainring from your bicycle.
2. Install the Motor: Mount the VSM01 mid-drive motor into the bottom bracket shell. Ensure the Anti-Wobble Spacer is correctly positioned to protect wiring and secure the motor firmly.
3. Attach Chainring and Cranks: Install the 44T chainring with its protective guard onto the motor, followed by the 170mm cranks.
4. Mount Display: Secure the VD41 LCD display to your handlebars.
5. Install Speed Sensor: Attach the speed sensor to the rear chainstay and the magnet to a spoke on the rear wheel, ensuring the correct mounting distance (8-15mm).
6. Connect Wiring: Use the provided 1T4 cable to connect the motor, display, speed sensor, and brake system (levers or sensors). Ensure all connections are snug and properly aligned.
7. Connect Battery: Connect your compatible 36V or 48V battery (not included) to the motor system.
8. Final Checks: Double-check all connections, ensure the motor is securely mounted, and test the brake cut-off function before riding.

6. Operation

6.1 VD41 LCD Display Functions

The VD41 LCD display is your command center. It powers on in approximately 3 seconds and provides the following information and controls:

• Walking Assisted Mode: For easy maneuvering while walking beside the bike.
• Headlight Indicator: Shows if your e-bike's headlight is on.
• PAS Level: Displays the current Pedal Assist System level (0-5).
• Subtotal Mileage (TRIP): Distance covered during the current ride.
• Total Mileage (ODO): Total distance covered by the e-bike.
• Speed Mode: Indicates the current speed mode.
• Real-time Speed: Your current riding speed.
• Speed Unit: Displays speed in MPH or KM/H.
• Mileage Unit: Displays distance in Miles or Kilometers.
• Power Level: Indicates the motor's power output.
• Battery Level: Shows remaining battery charge.

Display Specifications: 1.8" LED Screen, 0-5 PAS Level, Ø22.2 Holder Size, English Language, 36V/48V Compatible Voltage.

6.2 Riding Modes

• Pedal Assist Mode (PAS): The torque sensor provides instant, smooth, and proportional power based on your pedaling effort. Select from 0-5 PAS levels to adjust the assistance.
• Throttle Ebike Mode: Use the thumb throttle (if installed) for power on demand without pedaling.
• Walk Assist Mode: Provides low-speed assistance for pushing the bike.

6.3 Speed Limit Setting

The VD41 display allows for a 25 km/h speed limit setting. This feature is crucial for complying with local regulations for e-bikes on public roads. You can adjust this setting to unleash full power on private land where higher speeds are permitted.

7. Maintenance

Regular maintenance ensures the longevity and optimal performance of your Varstrom VSM01 kit:

• Cleaning: Keep the motor and display clean 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 signs of corrosion.
• Cables: Inspect cables for any fraying, cuts, or damage. Replace damaged cables immediately.
• Fasteners: Ensure all mounting bolts and screws are tight, especially those securing the motor and cranks.
• Battery Care: Follow the manufacturer's instructions for your e-bike battery regarding charging, storage, and temperature.

8. Troubleshooting

If you encounter issues with your Varstrom VSM01 kit, consider the following common solutions:

• Motor Not Providing Power:
  • Check if the battery is charged and properly connected.
  • Ensure the display is powered on and showing a PAS level greater than 0.
  • Verify all electrical connections are secure.
  • Check if the brake levers/sensors are engaged, which would cut motor power.
• Display Not Turning On:
  • Check battery connection and charge level.
  • Inspect the display cable for damage.
• Inconsistent Power/Jerky Ride:
  • Ensure the speed sensor is correctly aligned and the magnet is within the specified distance (8-15mm).
  • Check for any loose connections.
  • The intelligent Hall system should automatically adapt; if issues persist, contact support.

For persistent issues, please refer to the warranty and support section for assistance.

9. User Tips

• Bottom Bracket Verification: Always double-check your bike's bottom bracket size (68-73mm length, 33.5-36mm inner diameter) before ordering and installation to ensure proper fit.
• Battery Choice: While the motor is compatible with both 36V and 48V batteries, a 48V battery will generally provide more power and potentially better range.
• Torque Sensor Advantage: Leverage the torque sensor's natural feel by pedaling smoothly. This will optimize battery life and provide a more enjoyable riding experience.

10. Warranty & Support

Varstrom is committed to providing high-quality products and excellent customer service. Your VSM01 kit comes with the following warranty:

Warranty Coverage Details:

• If there is any quality problem within 6 months (based on delivery date), all warranty costs (repair cost, material cost, shipping cost, etc.) are the responsibility of the seller.
• If there is any quality problem more than 6 months but not more than 12 months (based on delivery date), the repair cost and material cost are the responsibility of the seller, but the shipping cost is the responsibility of 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 borne by the buyer. The exact cost depends on the specific issue.

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