Introduction
This user manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your FIIDO D3 Pro Foldable Electric Bicycle. Please read this manual thoroughly before using the bicycle to ensure proper handling and to prevent damage or injury.
The FIIDO D3 Pro is a lightweight and robust electric bicycle designed for various terrains, offering three riding modes: pure electric, cycling, and electric assist. Its foldable design allows for convenient storage and transport.
Safety Instructions
Always prioritize safety when operating your e-bike. Adhere to local traffic laws and regulations. Wear appropriate safety gear, including a helmet, at all times.
- Ensure all components are securely fastened before each ride.
- Check tire pressure and brake functionality regularly.
- Do not operate the e-bike under the influence of alcohol or drugs.
- Be aware of your surroundings and potential hazards.
- Avoid riding in extreme weather conditions.
- The maximum load capacity for this e-bike is 120 kg. Do not exceed this limit.
Setup
Unfolding the Bicycle
The FIIDO D3 Pro comes in a folded configuration for transport. Follow these steps to unfold and prepare your bicycle for use:
- Place the folded bicycle on a flat, stable surface.
- Release the frame latch and carefully unfold the main frame until it locks into place. Ensure the latch is securely engaged.
- Adjust the handlebar stem to the upright position and secure the quick-release lever.
- Extend the seat post to your desired riding height and tighten the quick-release clamp. Ensure the minimum insertion mark is not visible.
- Unfold the pedals.
Initial Battery Charge
Before your first ride, fully charge the battery. The charging time is approximately 5 hours.
- Locate the charging port on the bicycle.
- Connect the charger to the charging port and then to a standard 100-240V AC power outlet.
- The LED indicator on the charger will change color (e.g., red to green) when charging is complete.
- Disconnect the charger once the battery is fully charged.

Image: The FIIDO D3 Pro electric bicycle shown in both its compact folded state and its fully unfolded, ready-to-ride configuration. This illustrates the ease of storage and deployment.
Operating Instructions
Powering On/Off
To power on the e-bike, press and hold the power button on the LED display. To power off, press and hold the power button again.
Riding Modes
The FIIDO D3 Pro offers three distinct riding modes:
- Pure Electric Mode: Engage the throttle to ride without pedaling. This mode is supported for effortless cruising.
- Cycling Mode: Ride the bicycle like a traditional bike, using pedal power only. The electric system is off.
- Electric Power Assist System (PAS): This mode provides electric assistance as you pedal. The D3 Pro features a 3-gear electric assist system.
- First Gear Assist Speed: Approximately 10 km/h
- Second Gear Assist Speed: Approximately 15 km/h
- Third Gear Assist Speed: Approximately 20 km/h
Note: Actual assist speeds may vary based on rider weight, environment, and road conditions.
Gear Shifting
The bicycle is equipped with a single-speed drivetrain (12 teeth gear) and a PROWHEEL steel 52 teeth chain plate. Shifting between electric assist gears is done via the controls on the handlebar.
Braking
The FIIDO D3 Pro features mechanical front and rear dual disc brakes for stable and quick stopping power. Apply both brakes simultaneously for optimal braking performance. Avoid sudden, hard braking, especially at high speeds or on slippery surfaces.
Maintenance
Regular maintenance is crucial for the longevity and safe operation of your FIIDO D3 Pro e-bike.
Cleaning
- Clean the bicycle regularly with a damp cloth. Avoid using high-pressure washers directly on electrical components.
- Do not immerse the e-bike in water.
Battery Care
- Charge the battery regularly, even if the e-bike is not in use for extended periods (at least once every 2 months).
- Store the battery in a cool, dry place, away from direct sunlight and extreme temperatures.
- Do not disassemble or attempt to repair the battery pack.
Tires and Brakes
- Check tire pressure before each ride. The 14-inch tires should be inflated to the recommended pressure indicated on the tire sidewall.
- Inspect brake pads for wear and replace them when necessary.
- Ensure brake levers are firm and responsive. Adjust brake cables if there is excessive slack.
General Inspection
- Periodically check all bolts and nuts for tightness.
- Lubricate the chain regularly with bicycle chain lubricant.
- Inspect the frame for any signs of damage or cracks.
Troubleshooting
This section provides solutions to common issues you might encounter with your FIIDO D3 Pro e-bike. For problems not listed here, please contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| E-bike does not power on. | Battery is low or depleted. Power button not pressed correctly. | Charge the battery fully. Press and hold the power button firmly. |
| Motor not assisting. | Battery low. PAS mode not selected. Loose connection. | Charge the battery. Ensure PAS mode is active on the display. Check all cable connections. |
| Brakes feel weak. | Worn brake pads. Loose brake cable. | Inspect and replace brake pads. Adjust brake cable tension. |
| Unusual noises during riding. | Loose components. Dry chain. | Check all bolts and nuts for tightness. Lubricate the chain. |
Specifications
Detailed technical specifications for the FIIDO D3 Pro Foldable Electric Bicycle:
| Feature | Specification |
|---|---|
| Model | FIIDO D3 Pro |
| Frame Material | Aluminum Alloy |
| Motor | 250W Brushless Geared Motor (Rear Wheel Hub) |
| Max Speed | 25 km/h (15.5 mph) |
| Battery Type | High-Quality Lithium Battery |
| Battery Capacity | 36V, 7.5 Ah (270 Wh) |
| Charging Time | Approx. 5 hours |
| Range (Electric Assist) | Up to 60 km (37 miles) |
| Display | LED Display with USB Charging Port |
| Brakes | Mechanical Front and Rear Dual Disc Brakes |
| Tire Size | 14 inches (35.56 cm) |
| Max Load Capacity | 120 kg (264 lbs) |
| Net Weight | Approx. 18 kg (39.6 lbs) |
| Folded Dimensions | Approx. 125 x 55 cm (49.2 x 21.7 inches) |
| Unfolded Dimensions | Approx. 125 x 63 cm (49.2 x 24.8 inches) |
| Operating Temperature | -10°C to 40°C (14°F to 104°F) |
Warranty and Support
FIIDO aims to provide excellent customer service. For warranty information, technical support, or spare parts, please refer to the official FIIDO website or contact your point of purchase.
If you have questions regarding our products and services, do not hesitate to contact us. We are committed to providing a satisfactory solution.