1. Introduction
Welcome to the DUOTTS F26 Lite Electric Bike user manual. This guide 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.
2. Important Safety Warnings
⚠ Please mind potential fire risk and strictly follow the instruction manual for charging and storage. While using the product, please wear protective equipment and fully comply with the applicable law and regulations.
- Always wear a helmet and appropriate safety gear when riding.
- Familiarize yourself with local laws and regulations regarding electric bicycles.
- Perform a pre-ride inspection before each use, checking brakes, tires, and battery.
- Do not operate the e-bike 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.
- Do not modify the e-bike's electrical system or motor.
3. Package Contents
Your DUOTTS F26 Lite Electric Bike package should include the following components:
- DUOTTS F26 Lite Electric Bike (partially assembled)
- 48V 2A Charger
- User Manual
- Assembly Tools (basic wrench set, hex keys)
- Pedals
- Front Wheel
- Handlebar Assembly
- Seat Post and Saddle
4. Specifications
The DUOTTS F26 Lite is designed for robust performance across various terrains. Below are its key specifications:
| Feature | Specification |
|---|---|
| Product Type | Electric Fat Bike |
| Frame Material | Aluminum Alloy |
| Motor | 48V 500W (Rated Power), 750W (Peak Power) |
| Max Torque | 65 N·m |
| Battery Capacity | 48V 18AH (YUANDONG 21700 Cells) |
| Max Range (Assisted) | Approx. 80–90 km (Pedal-Assist Mode) |
| Max Range (Electric) | Approx. 40–45 km (Pure Electric Mode) |
| Max Speed (Unlocked) | Max 50 km/h |
| Default Speed | 25 km/h (Adjustable via P08 setting) |
| Tire Size | 26" x 4.0 (Fat Tires) |
| Brakes | Hydraulic Disc Brake (Front and Rear) |
| Gears | Shimano 1*7 Speed Derailleur |
| Display | LCD Screen (3.2-inch LED Display) |
| Riding Modes | 6 Power Levels (0-5, Level 0 is Off) |
| Climbing Angle | Max 30° |
| Max Load Capacity | 150 kg |
| Net Weight | ≈34.81 kg |
| Waterproof Rating | IPX4 (Rain Splash Resistant) |
| Bluetooth | Supports Bluetooth connection to DUOTTS APP |
| Recommended Rider Height | 170–200 cm |
| Charging Time | 8–9 hours (via 54.6V 2A Charger) |
| Product Dimensions | Approx. 1930 x 720 x 1180 mm |
| Color Options | Black Red, Silver White |
5. Assembly and Initial Setup
Your DUOTTS F26 Lite Electric Bike comes partially assembled. Follow these steps to complete the assembly:
- Unpack the Bike: Carefully remove the bike and all components from the packaging. Retain packaging for future transport or returns.
- Install the Front Wheel:
- Align the front wheel with the fork dropouts.
- Insert the quick-release skewer through the hub.
- Tighten the skewer nuts and secure the quick-release lever.
- Ensure the wheel spins freely and is centered.
- Attach the Handlebar:
- Loosen the stem bolts on the fork.
- Insert the handlebar stem into the fork steerer tube.
- Adjust the handlebar to a comfortable height and align it with the front wheel.
- Tighten the stem bolts securely.
Handlebar assembly with LCD display and controls. - Install the Pedals:
- Identify the left (L) and right (R) pedals.
- Thread the 'L' pedal counter-clockwise into the left crank arm.
- Thread the 'R' pedal clockwise into the right crank arm.
- Tighten firmly with a wrench.
- Adjust the Seat:
- Insert the seat post into the frame's seat tube.
- Adjust the saddle height so your leg has a slight bend at the knee when the pedal is at its lowest point.
- Secure the quick-release lever or seat post clamp.
- Check Brakes and Gears:
- Ensure both front and rear hydraulic disc brakes are functioning correctly.
- Verify the Shimano 7-speed derailleur shifts smoothly through all gears.
Detail of the ZOOM Hydraulic Disc Brakes for powerful stopping. 
The Shimano 1-7 speed gear system for smooth shifting. - Charge the Battery: Fully charge the battery before your first ride. Refer to the "Charging the Battery" section for details.
6. Operating Instructions
Understanding your e-bike's controls and features will enhance your riding experience.
6.1 Powering On/Off
Locate the power button on the LCD display. Press and hold to turn the bike on or off.
6.2 LCD Display and Controls
The 3.2-inch LED display provides essential riding information and allows you to adjust settings.
- Speed Indicator: Shows current speed.
- Battery Level: Displays remaining battery charge.
- Assist Level: Indicates the current pedal-assist level (0-5).
- Odometer/Trip Meter: Tracks total distance or current trip distance.
- P08 Setting: Allows adjustment of the default speed limit. Consult the full display manual for advanced settings.
6.3 Riding Modes
The F26 Lite offers 6 power levels (0-5) for pedal assistance:
- Level 0: No electrical assistance (pure pedal power).
- Levels 1-5: Increasing levels of motor assistance. Use '+' and '-' buttons on the handlebar to adjust.
- Pure Electric Mode: Use the throttle for propulsion without pedaling.
6.4 Gear Shifting
Your e-bike is equipped with a Shimano 1*7 speed derailleur. Use the shifter on the handlebar to change gears according to terrain and desired speed. Shift smoothly to avoid strain on the drivetrain.
6.5 Braking
The hydraulic disc brakes provide powerful and reliable stopping power. Apply both front and rear brakes simultaneously for effective and controlled deceleration. Avoid sudden, hard braking, especially at high speeds.
6.6 Lights and USB Charging Port
- Headlight: Turn on the high-brightness headlight for night riding.
- Taillight: The bright taillight includes a flashing brake light for enhanced visibility.
- USB Charging Port: Located on the display or handlebar, this port allows you to easily charge your phone while riding.
6.7 Bluetooth Connectivity
The DUOTTS F26 Lite supports Bluetooth connection to the DUOTTS APP. Download the official app to access additional features, track your rides, and customize settings.
7. Charging the Battery
The 48V 18Ah Lithium battery provides reliable power. Proper charging ensures longevity and performance.
- Charging Time: A full charge typically takes 8-9 hours using the provided 54.6V 2A charger.
- Charging Process:
- Ensure the e-bike is turned off.
- 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 charger indicator light will typically show red during charging and turn green when fully charged.
- Disconnect the charger once charging is complete.
- Battery Care:
- Do not overcharge the battery.
- Charge in a well-ventilated area, away from flammable materials.
- Avoid completely draining the battery before recharging.
- Store the battery in a cool, dry place when not in use, and charge it periodically if stored for long periods.
8. Maintenance
Regular maintenance will ensure the longevity and safe operation of your DUOTTS F26 Lite.
- Tire Pressure: Check tire pressure regularly. The 26" x 4.0 fat tires require specific pressure for optimal performance and comfort. Refer to the tire sidewall for recommended PSI.
- Brakes: Inspect brake pads for wear and replace as needed. Ensure hydraulic brake fluid levels are adequate and lines are free from leaks.
- Chain: Keep the chain clean and lubricated to ensure smooth gear changes and prevent wear.
- Fasteners: Periodically check all bolts, nuts, and quick-release levers for tightness.
- Cleaning: Clean the bike with a damp cloth. Avoid using high-pressure washers directly on electrical components. The bike has an IPX4 waterproof rating, meaning it is rain splash resistant, but not submersible.
- Battery: Keep battery terminals clean. If storing the bike for an extended period, remove the battery and store it in a cool, dry place, charging it every 1-2 months.
9. Troubleshooting
Here are some common issues and their potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Bike does not power on | Battery not charged, battery not connected, power button not pressed correctly | Charge battery, ensure battery is securely seated, press and hold power button |
| Motor not assisting | Assist level set to 0, battery low, motor connection issue | Increase assist level, charge battery, check motor cable connections |
| Brakes feel weak | Worn brake pads, air in hydraulic lines, misaligned calipers | Inspect/replace pads, bleed brakes (professional service recommended), adjust calipers |
| Gears not shifting smoothly | Derailleur out of adjustment, dirty/dry chain, bent hanger | Adjust derailleur, clean and lubricate chain, inspect hanger for damage |
| Unusual noises during ride | Loose components, dry chain, brake rub | Check all fasteners, lubricate chain, adjust brake calipers |
If you encounter issues not listed here or cannot resolve a problem, please contact customer support.
10. User Tips
- Optimize Range: To maximize battery range, use lower pedal-assist levels, pedal consistently, and avoid sudden accelerations or steep climbs in high assist modes.
- Terrain Adaptability: The 26" x 4.0 fat tires are excellent for various terrains. Adjust tire pressure for different surfaces: lower pressure for soft terrain (sand, snow) for better grip, higher pressure for paved roads for efficiency.
- Security: Always secure your e-bike with a robust lock when unattended, even for short periods.
- App Integration: Utilize the DUOTTS APP via Bluetooth for ride tracking, diagnostics, and potential firmware updates to enhance your riding experience.
11. Warranty and Support
For warranty information, technical support, or replacement parts, please refer to the official DUOTTS website or contact your retailer. Keep your purchase receipt as proof of purchase.
⚠ Disclaimer: This manual provides general guidelines. Always prioritize safety and consult a professional bicycle mechanic for complex repairs or adjustments.
