1. Introduction
Thank you for choosing the 5TH WHEEL LB18 Electric Bike. This manual provides essential information for the safe assembly, operation, and maintenance of your new electric bicycle. Please read this manual thoroughly before your first ride to ensure optimal performance and safety. Retain this manual for future reference.

Figure 1: The 5TH WHEEL LB18 Electric Bike, showcasing its robust frame, fat tires, and front suspension.
2. Safety Information
Your safety is paramount. Always adhere to local traffic laws and regulations. Failure to follow these guidelines may result in serious injury or property damage.
- Always wear a certified helmet when riding.
- Perform a pre-ride inspection before each use, checking brakes, tire pressure, and battery level.
- Do not ride under the influence of alcohol or drugs.
- Be aware of your surroundings and ride defensively.
- Avoid riding in adverse weather conditions, such as heavy rain or snow.
- Ensure all bolts and quick releases are securely tightened before riding.
- The maximum recommended rider weight for this bicycle is 120 kg (265 lbs).
3. Package Contents
Upon unpacking, please verify that all components are present and undamaged:
- 5TH WHEEL LB18 Electric Bike (partially assembled)
- Lithium-Ion Battery (pre-installed or separate)
- Battery Charger
- Tool Kit
- Pedals
- User Manual (this document)
4. Setup and Assembly
Follow these steps to assemble your electric bike. It is recommended to have a second person assist with some steps.
- Unpack the Bike: Carefully remove the bike and all components from the packaging. Retain packaging for potential future transport or returns.
- Install the Front Wheel: If detached, align the front wheel with the fork dropouts. Ensure the disc brake rotor is correctly seated within the caliper. Secure with the quick-release skewer or axle nuts.
- Install the Handlebar: Attach the handlebar to the stem, ensuring it is centered and the brake levers and shifters are in a comfortable position. Tighten the stem bolts securely.
- Install the Seat Post: Insert the seat post into the frame's seat tube. Adjust the seat height for comfortable pedaling, ensuring your leg has a slight bend at the bottom of the pedal stroke. Secure with the quick-release lever.
- Attach the Pedals: Identify the left (L) and right (R) pedals. The left pedal threads counter-clockwise, and the right pedal threads clockwise. Apply a small amount of grease to the threads and tighten firmly with a wrench from the tool kit.
- Install the Battery: If the battery is not pre-installed, slide it into its designated slot on the frame until it clicks securely into place. Ensure it is locked with the key if applicable.
- Initial Battery Charge: Fully charge the battery before your first ride. Refer to the "Battery Information" section for charging instructions.
- Pre-Ride Check: Before riding, double-check all connections, brake functionality, tire pressure, and ensure the quick releases are tight.
5. Operating Instructions
Familiarize yourself with the controls and functions of your 5TH WHEEL LB18 Electric Bike.
5.1 Powering On/Off
To power on the bike, press and hold the power button on the display panel for a few seconds. The display will illuminate. To power off, press and hold the power button again until the display turns off.
5.2 Pedal Assist System (PAS)
The LB18 features a Pedal Assist System (PAS) that provides motor assistance as you pedal. Use the '+' and '-' buttons on the control panel to adjust the assist level (typically 0-5). Level 0 provides no assistance, while higher levels provide more power.
5.3 Throttle Operation
Your e-bike is equipped with a thumb throttle. Gently press the throttle to engage the motor without pedaling. The throttle provides power up to the maximum speed allowed by law or the bike's settings. Use the throttle responsibly and be mindful of your speed.
5.4 Gear Shifting
The 7-speed gear system allows you to adapt to various terrains and riding conditions. Use the shifter on the handlebar to change gears. Shift to a lower gear for climbing hills and a higher gear for flat terrain or downhill riding. Shift smoothly and avoid shifting under heavy load.
5.5 Braking
The LB18 is equipped with disc brakes for reliable stopping power. The right lever controls the rear brake, and the left lever controls the front brake. Apply both brakes simultaneously for effective and controlled stopping. Avoid sudden, hard braking, especially with the front brake, to prevent skidding.
6. Battery Information
The 5TH WHEEL LB18 is powered by a removable Lithium-Ion battery. Proper care extends battery life and ensures safe operation.

Figure 2: The removable 36V 13AH Lithium-Ion battery, designed for easy installation and removal from the bike frame.
6.1 Charging the Battery
- Ensure the bike is turned off before charging.
- Connect the charger to the battery charging port.
- Plug the charger into a standard wall outlet.
- The charger indicator light will typically turn red during charging and green when fully charged.
- Do not overcharge the battery. Disconnect the charger once charging is complete.
- Charging time is approximately 4-6 hours for a full charge.
6.2 Battery Care and Storage
- Store the battery in a cool, dry place, away from direct sunlight and extreme temperatures.
- If storing for extended periods, charge the battery to 50-70% every 2-3 months to maintain its health.
- Do not expose the battery to water or moisture.
- Only use the original charger provided with the bike.
7. Maintenance
Regular maintenance ensures the longevity and safe operation of your electric bike.
- Tires: Check tire pressure before each ride. Recommended pressure is typically found on the tire sidewall. Inspect for wear and punctures.
- Brakes: Regularly check brake pads for wear and ensure brake levers provide firm and responsive stopping power. Adjust or replace as needed.
- Chain: Keep the chain clean and lubricated. A well-lubricated chain reduces wear and improves shifting performance.
- Bolts and Fasteners: Periodically check all bolts, nuts, and quick releases for tightness. Loose components can lead to safety hazards.
- Cleaning: Clean the bike with a damp cloth and mild soap. Avoid using high-pressure washers directly on electrical components.
- Suspension: Inspect the front suspension for proper function and cleanliness. The seat suspension should also be checked for smooth operation.
8. Troubleshooting
This section addresses common issues you might encounter with your electric bike.
| Problem | Possible Cause | Solution |
|---|---|---|
| Bike does not power on | Battery not charged; Battery not properly seated; Loose electrical connection | Charge battery; Ensure battery is fully inserted and locked; Check all visible cable connections. |
| Motor not assisting | PAS level is 0; Brake levers engaged; Loose motor cable connection | Increase PAS level; Release brake levers; Check motor cable connection. |
| Brakes feel weak | Worn brake pads; Cable tension too loose; Air in hydraulic system (if applicable) | Inspect and replace brake pads; Adjust brake cable tension; Consult a bike mechanic for hydraulic brake issues. |
| Gears are skipping or not shifting smoothly | Derailleur out of adjustment; Bent derailleur hanger; Dirty or dry chain | Adjust derailleur; Inspect hanger for damage; Clean and lubricate chain. |
If you encounter issues not listed here or require further assistance, please contact 5TH WHEEL customer support.
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | LB18 |
| Motor Power | 500W |
| Top Speed | Up to 32 KM/H (19.8 MPH) |
| Wheel Size | 26 Inches |
| Tire Type | Fat Tire |
| Gears | 7-Speed |
| Brake Type | Disc Brakes |
| Suspension | Front Suspension (and seat suspension) |
| Battery | 36V 13AH Lithium-Ion (approx. 45 miles max range) |
| Frame Material | Iron |
| Item Weight | 31.9 kg (70.3 lbs) |
| Included Components | Tool Kit |
10. Warranty and Support
For warranty information, technical support, or replacement parts, please contact 5TH WHEEL customer service. Refer to your purchase documentation for specific warranty terms and contact details.
Manufacturer: Invanti (Beijing) Technology Co., Ltd.
Model: LB18
ASIN: B0DSKZ9TCR