1. Introduction
Welcome to the VAKOLE SG20 E-Bike user manual. This document provides essential information for the safe operation, assembly, maintenance, and troubleshooting of your new electric bicycle. The VAKOLE SG20 is a versatile 20-inch fatbike designed for various terrains, featuring a powerful 250W brushless motor and a long-lasting 48V 15.6Ah Samsung battery.

Image 1.1: The VAKOLE SG20 E-Bike, a grey fatbike with orange accents, shown from the front-left angle, highlighting its robust tires and frame design.
2. Safety Information
Always prioritize safety when operating your e-bike. Read and understand all warnings and instructions before riding. Failure to do so may result in serious injury or property damage.
- Always wear a helmet that meets local safety standards.
- Obey all local traffic laws and regulations.
- Perform a pre-ride inspection before each use, checking brakes, tires, and battery.
- Do not ride under the influence of alcohol or drugs.
- Avoid riding in adverse weather conditions or on slippery surfaces.
- Ensure the battery is securely locked in place before riding.
3. Package Contents
Upon opening your VAKOLE SG20 E-Bike package, please verify that all the following components are included:
- 1 x VAKOLE SG20 Electric Bicycle
- 1 x Tool Bag
- 1 x Tire Repair Tool
- 1 x Tire Pump
- 1 x Multifunction Tool Kit
- 1 x Phone Holder
- 1 x Charger
If any items are missing or damaged, please contact VAKOLE customer support immediately.
4. Setup & Assembly
Your VAKOLE SG20 E-Bike comes partially assembled. Follow these steps to complete the assembly and prepare for your first ride.
- Unpacking: Carefully remove the bike and all components from the packaging. Retain the packaging for future transport or storage.
- Handlebar Installation: Attach the handlebar to the stem, ensuring it is centered and tightened securely. Adjust the angle for comfortable riding.
- Pedal Installation: Identify the left (L) and right (R) pedals. The left pedal tightens counter-clockwise, and the right pedal tightens clockwise. Apply a small amount of grease to the threads before installation.
- Seat Post and Saddle: Insert the seat post into the frame and adjust the saddle height to ensure your feet can comfortably touch the ground when stopped. Secure the quick-release lever.
- Battery Installation: Insert the battery into its compartment on the frame. Ensure it clicks securely into place and lock it with the provided key.
- Tire Inflation: Inflate both tires to the recommended pressure indicated on the tire sidewall.
- Brake Check: Test both front and rear brakes to ensure they engage properly and provide adequate stopping power.
- Final Inspection: Double-check all bolts, nuts, and quick releases to ensure they are tightened correctly.

Image 4.1: A person demonstrating the removal of the VAKOLE SG20 E-Bike's integrated battery from the frame, highlighting its removable design for charging or security.
5. Operating Instructions
Familiarize yourself with the controls and functions of your VAKOLE SG20 E-Bike for an optimal riding experience.
5.1 Powering On/Off
To power on the e-bike, press and hold the power button on the display unit. To power off, press and hold the same button until the display turns off.
5.2 Riding Modes
The VAKOLE SG20 offers multiple riding modes:
- Pure Electric Mode: Engage the throttle for motor-only propulsion. This mode provides a range of 40-60 km.
- Pedal Assist Mode (PAS): The motor provides assistance as you pedal. Adjust the assist level using the display controls. This mode offers an extended range of 70-110 km.
- Manual Mode: Ride the bike like a traditional bicycle without motor assistance.
5.3 Gear Shifting
The e-bike is equipped with a 7-speed Shimano gear system. Use the shifter on the handlebar to change gears according to terrain and desired speed. Shift smoothly to avoid strain on the drivetrain.

Image 5.1: A close-up view of the VAKOLE SG20 E-Bike's drivetrain, showing the chain, rear derailleur, and cassette, indicating its multi-speed capability.
5.4 Braking System
The SG20 features hydraulic disc brakes for reliable stopping power. Apply both front and rear brakes simultaneously for effective and controlled deceleration. Avoid sudden, hard braking, especially at high speeds.

Image 5.2: A detailed view of the VAKOLE SG20 E-Bike's front fork and disc brake system, showcasing the suspension and the hydraulic brake caliper.
5.5 Battery Charging
To charge the battery, connect the charger to the charging port on the battery or directly to the battery if removed from the bike. Plug the charger into a standard wall outlet. The indicator light on the charger will change when fully charged. Do not overcharge the battery.
5.6 Smart App Integration (Key-Disp)
The VAKOLE SG20 supports the Key-Disp smart application. Download the app to your smartphone and follow the instructions to connect it to your e-bike. The app allows for advanced control, monitoring, and customization of your riding experience.

Image 5.3: The VAKOLE SG20 E-Bike parked on a gravel path next to a wooded area, illustrating its suitability for outdoor environments.
6. Maintenance
Regular maintenance is crucial for the longevity and performance of your VAKOLE SG20 E-Bike.
- Tire Pressure: Check tire pressure regularly (at least once a week) and inflate to the recommended PSI.
- Brake Inspection: Periodically inspect brake pads for wear and ensure brake levers are responsive. Adjust or replace as needed.
- Chain Lubrication: Keep the chain clean and lubricated to ensure smooth gear changes and prevent rust.
- Battery Care: Store the battery in a cool, dry place. If storing for extended periods, charge it to about 50-70% and recharge every 2-3 months.
- Cleaning: Clean the bike with a damp cloth and mild soap. Avoid high-pressure washing directly on electrical components.
- Fastener Check: Regularly check and tighten all bolts and fasteners, especially on critical components like the handlebars, seat post, and wheels.

Image 6.1: A close-up of the VAKOLE SG20 E-Bike's rear rack and integrated taillight, emphasizing its utility and safety features.
7. Troubleshooting
This section addresses common issues you might encounter with your VAKOLE SG20 E-Bike.
| Problem | Possible Cause | Solution |
|---|---|---|
| Bike does not power on | Battery not charged or not properly seated; loose electrical connection. | Charge the battery fully. Ensure the battery is securely inserted and locked. Check all visible cable connections. |
| Motor not assisting | PAS level set to zero; brake levers engaged; motor error. | Increase PAS level on the display. Ensure brake levers are fully released. Check display for error codes. |
| Brakes feel weak | Worn brake pads; air in hydraulic line; misaligned caliper. | Inspect and replace brake pads if worn. Consult a bike mechanic for hydraulic system bleeding or caliper alignment. |
| Unusual noises from drivetrain | Dry or dirty chain; misaligned derailleur. | Clean and lubricate the chain. If noise persists, a derailleur adjustment may be needed by a professional. |
For issues not listed here or if solutions do not resolve the problem, please contact VAKOLE customer support.
8. Specifications
Detailed technical specifications for the VAKOLE SG20 E-Bike:
| Feature | Specification |
|---|---|
| Brand | VAKOLE |
| Model Number | SG20 |
| Motor | 250W Brushless Motor |
| Battery | 48V 15.6Ah Samsung Battery |
| Wheel Size | 20 Inches |
| Tires | 20 x 4.0" CST Fatbike Tires |
| Brakes | Hydraulic Disc Brakes |
| Gears | 7-Speed |
| Frame Material | Aluminum |
| Suspension | Fork Suspension |
| Pure Electric Range | 40-60 km |
| Pedal Assist Range | 70-110 km |
| Product Dimensions (L x W x H) | 172.01 x 69 x 109 cm |
| Product Weight | 32 kg |
9. Warranty & Support
VAKOLE provides a limited warranty for the SG20 E-Bike against manufacturing defects. Please refer to the warranty card included with your purchase for specific terms and conditions, including coverage period and claim procedures.
For technical support, spare parts, or warranty claims, please contact VAKOLE customer service through their official channels. You can also visit the official VAKOLE store on Amazon for more information and product updates: VAKOLE Amazon Store.





