1. Introduction and Safety Guidelines
This manual provides essential information for the safe assembly, operation, and maintenance of your SISIGAD F618 Electric Mountain Bike. Please read it thoroughly before your first ride and keep it for future reference. Failure to follow these instructions can result in serious injury or product damage.
Important Safety Information:
- Always wear a helmet and appropriate safety gear when riding.
- Ensure all components are securely fastened before each ride.
- Familiarize yourself with local e-bike regulations and traffic laws.
- Do not ride under the influence of alcohol or drugs.
- Regularly inspect brakes, tires, and battery for proper function.
- The bike is UL2849 certified, indicating compliance with electrical system safety standards.
2. Package Contents
Upon unpacking, verify that all items are present:
- SISIGAD F618 Electric Mountain Bike (partially assembled)
- Mudguard
- Rear Rack
- Tool Kit
- User Manual (this document)
- Battery Charger
3. Assembly Instructions
The SISIGAD F618 Electric Mountain Bike comes mostly pre-assembled. The included tool kit and clear instructions will guide you through the final steps. Typically, this involves attaching the front wheel, handlebars, pedals, seat, mudguards, and rear rack.
For visual guidance, please refer to the official assembly video:
Video: SISIGAD Super Offroad Ebike City Ebike Display. This video demonstrates key features and aspects of the e-bike, including assembly components.
4. Components Overview
Familiarize yourself with the main components of your electric bike:
- Motor: 750W (Peak 1500W) motor, providing up to 90 N.m of torque.
- Battery: 48V 15Ah removable lithium-ion battery, integrated into the frame.
- Tires: 26" x 4" fat tires designed for various terrains.
- Gears: 7-speed gear system.
- Brakes: Dual mechanical disc brakes (front and rear 160mm).
- Suspension: Dual suspension, including an alloy front suspension fork with 80mm travel.
- Display: Smart LCD display for monitoring speed, battery level, and pedal assist mode.
- Lighting: LED headlight and taillight.
- Seat: Soft and adjustable seat.
- Rear Rack: Sturdy rear rack, capable of carrying up to 55 lbs (25kg).

Image: Illustration of the 1500W peak power motor, highlighting 90 N.m torque, 32mph top speed, and 7-speed shifter.

Image: Close-up of the 48V 15Ah built-in removable battery, indicating 4-6 hours charging time and IPX6 waterproof rating.

Image: View of the front suspension fork with 80mm travel, designed for shock absorption.
5. Setup and Initial Checks
Battery Charging:
Before your first ride, fully charge the battery. The 48V 15Ah removable battery takes approximately 4-6 hours to charge from empty to full. You can charge the battery while it's installed on the bike or remove it for charging.

Image: Depicts two methods of charging the e-bike battery: directly on the bike or removed for charging.
Pre-Ride Checklist:
- Check tire pressure (refer to tire sidewall for recommended PSI).
- Test both front and rear brakes for effective stopping power.
- Ensure handlebars and seat are adjusted to a comfortable and safe height and are securely tightened.
- Verify that the battery is fully charged and securely locked in place.
- Confirm all quick releases and bolts are tight.
6. Operating Instructions
Power On/Off:
Press and hold the power button on the LCD display to turn the bike's electrical system on or off.
Pedal Assist System (PAS):
The bike features 5 levels of pedal assist. Use the '+' and '-' buttons on the display control panel to adjust the assist level. Higher levels provide more motor assistance while pedaling. The system is speed-sensing for a natural riding experience.
Throttle Operation:
The throttle provides power on demand without pedaling. Gently twist the throttle to engage the motor. Be cautious when using the throttle, especially at higher assist levels.
Gear Shifting:
Your bike is equipped with a 7-speed gear system. Use the shifter on the handlebars to change gears, allowing you to adapt to different terrains and inclines. Shift smoothly to avoid damage to the drivetrain.
LCD Display:
The smart LCD display shows important riding data such as current speed, battery charge level, pedal assist level, and trip distance. Refer to the display for real-time information during your ride.
Video: SISIGAD Fat Tire Electric Bike Display. This video showcases the functionality and features of the e-bike's display unit.
7. Maintenance
Regular maintenance ensures the longevity and safe operation of your e-bike.
Cleaning:
Wipe the bike with a damp cloth. Avoid using high-pressure water jets directly on electrical components.
Tires:
Maintain correct tire pressure for optimal performance and safety. Inspect tires regularly for wear and damage.
Brakes:
Check brake pads for wear and replace them when necessary. Ensure brake levers are responsive and provide adequate stopping power. The dual disc brakes are designed for quick and smooth stops.
Battery Care:
Store the battery in a cool, dry place. Avoid fully discharging the battery frequently. Charge it regularly, even if not in use, to maintain battery health.
Chain and Drivetrain:
Keep the chain clean and lubricated for smooth gear changes and to prevent wear.
8. Troubleshooting
If you encounter issues with your SISIGAD F618, refer to these common troubleshooting tips:
- Bike not powering on: Check if the battery is fully charged and properly seated. Ensure the power button is pressed and held correctly.
- Motor not assisting: Verify the pedal assist level on the display. Ensure the battery has sufficient charge. Check for any loose connections to the motor.
- Brakes squealing: This can often be resolved by cleaning the brake rotors and pads. If the issue persists, brake pads may need replacement or adjustment.
- Unusual noises: Inspect the chain, gears, and wheels for any obstructions or loose parts.
For persistent problems, contact SISIGAD customer support.
9. Specifications
| Feature | Specification |
|---|---|
| Bike Type | Commuting Ebike, Beach Ebike, Mountain Ebike, Road Ebike |
| Age Range | Adult |
| Brand | SISIGAD |
| Number of Speeds | 7 |
| Color | F618-BLK |
| Wheel Size | 26 Inches |
| Frame Material | Carbon Steel |
| Suspension Type | Dual |
| Special Features | Adjustable Seat, Digital Display, Dual Disc Brake, Dual Suspension, Rechargeable |
| Item Weight | 87 Pounds |
| Power Source | Battery |
| Wattage | 750 watts |
| Lithium Battery Energy Content | 720 Watt Hours |
| Maximum Weight Recommendation | 450 Pounds |
| Voltage | 48 Volts |

Image: Size guide for the SISIGAD F618 Electric Bike, showing dimensions and recommended rider height (5'3"-6'4"), bicycle weight (85.9 lbs), and load capacity (500 lbs).
10. Warranty and Support
Warranty Information:
The SISIGAD F618 Electric Mountain Bike comes with a 365-day limited warranty covering manufacturing defects. The battery has a 6-month warranty. Please retain your proof of purchase for warranty claims.
Customer Support:
If you have any questions, require assistance with assembly, or experience any problems with your e-bike, please contact SISIGAD customer support. We are committed to providing satisfactory after-sales service.
For further information, visit the official SISIGAD store: SISIGAD Store





