Introduction
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your Aairsk GT900 Electric Bicycle. Please read it thoroughly before your first ride and keep it for future reference.
⚠️ 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.
Safety Guidelines
- Always wear a helmet and appropriate safety gear when riding.
- Familiarize yourself with local traffic laws and regulations regarding electric bicycles.
- Perform pre-ride checks before each use.
- Do not operate the bicycle under the influence of alcohol or drugs.
- Ensure the battery is properly secured and charged according to instructions.
- Avoid riding in extreme weather conditions or on excessively challenging terrain until you are fully comfortable with the bike's handling.
Package Contents
Your Aairsk GT900 Electric Bicycle package should include:
- Aairsk GT900 Electric Bicycle (partially assembled)
- Battery and Charger
- Key Card for Keyless Unlock
- User Manual (this document)
- Basic Assembly Tools (may vary)
Setup and Assembly
The Aairsk GT900 Electric Bicycle comes partially assembled. Follow these steps for final assembly and initial setup:
- Unpacking: Carefully remove all components from the packaging. Retain packaging for potential future transport or returns.
- Handlebar Installation: Attach the handlebar to the stem, ensuring it is centered and tightened securely. Adjust the angle for comfortable riding.
- Front Wheel Installation: Install the front wheel, ensuring the disc brake rotor is correctly aligned with the caliper. Secure the quick-release or axle nuts firmly.
- Pedal Installation: Identify the left (L) and right (R) pedals. Thread the pedals into the crank arms. Note that the left pedal has a reverse thread. Tighten securely with a wrench.
- Seat Post and Saddle Adjustment: Insert the seat post into the frame and adjust the saddle height for comfortable pedaling. Ensure the quick-release clamp is tightened firmly to prevent slippage.
- Battery Installation & Initial Charge:
- Locate the battery compartment within the frame.
- Insert the 36V 13AH Lithium Battery (468Wh) into its housing.
- Ensure the battery is securely locked in place.
- Before first use, fully charge the battery. Connect the charger to the battery port and then to a power outlet. The charging time is approximately 5-6 hours.
- The battery features a Battery Management System (BMS) for protection.
Figure 1: Illustration of the integrated 468Wh (36V 13AH) battery within the bicycle frame. 
Figure 2: Specifications of the 468Wh battery, including 36V 13AH, 30-40km throttle range, 40-60km PAS range, 5-6 hour charge time, and BMS protection. - Keyless Unlock Setup: Your GT900 features a keyless unlock system using a card key.
- To unlock: Touch the card key to the LCD display.
- To lock: Touch the card key to the LCD display again.
Figure 3: Smart LCD Display and Keyless Unlock system with card key interaction. - Pre-Ride Safety Check: Before your first ride and periodically thereafter, check the following:
- Brakes: Ensure both front and rear disc brakes are functioning correctly and levers are easily accessible.
- Tires: Inflate tires to the recommended pressure (check tire sidewall for details).
- Quick Releases/Bolts: Confirm all quick releases and bolts (wheels, seat post, handlebars) are securely tightened.
- Lights: Test the front light and horn.
Operating Instructions
The Aairsk GT900 offers a versatile riding experience with multiple modes and features.
Powering On/Off
To power on the electric system, press and hold the power button on the Smart LCD Display. Repeat to power off.
Riding Modes
Your GT900 features three primary riding modes:
- Classic Bike Pedal Mode (A-Z): Ride the bicycle like a traditional bike, using only pedal power. The electric motor does not engage in this mode.
- Throttle Mode (A-B): Engage the motor directly using the thumb throttle. This mode provides electric power without pedaling, offering a range of approximately 30-40 km on a full charge.
- Pedal Assist System (PAS) Mode (A-C): The motor provides assistance as you pedal. The GT900 offers 5 levels of pedal assist. This mode extends your range to approximately 40-60 km on a full charge.
Gear Shifting (Shimano 21-Speed)
The GT900 is equipped with a Shimano 21-speed derailleur system for stable and smooth shifting performance. Use the shifters on the handlebars to change gears according to terrain and desired pedaling effort.
Smart LCD Display
The Smart LCD Display provides real-time information about your ride, including speed, battery level, assist level, and mileage. Use the '+' and '-' buttons to adjust pedal assist levels or navigate display options.
Braking System
The bicycle features front and rear dual disc brakes for fast, stable, and effective stopping power. Apply both brake levers smoothly and evenly for optimal control.
Front Light and Horn
The integrated front light ensures visibility and safety during low-light conditions. Use the horn to alert others when necessary.
Maintenance
Regular maintenance ensures the longevity and safe operation of your Aairsk GT900.
- Battery Care:
- Charge the battery fully after each ride, especially if it's been heavily discharged.
- Avoid completely draining the battery.
- If storing the bike for an extended period, charge the battery to 50-70% and store it in a cool, dry place. Recharge every 1-2 months.
- Do not expose the battery to extreme temperatures.
- Tire Pressure: Check tire pressure regularly (at least weekly) and inflate to the recommended PSI found on the tire sidewall. The 1.95" wider tires are designed for versatile terrain handling, comfort, traction, and stability.
Figure 8: Tire suitability for different riding conditions. - Brake Inspection: Regularly inspect brake pads for wear and replace them when necessary. Check brake cables for fraying or damage. Ensure disc rotors are clean and free of oil or grease.
- Chain and Drivetrain: Keep the chain clean and lubricated. Inspect gears and derailleur for proper alignment and function.
- Suspension System: The dual suspension system (front fork and rear shock) provides better control and less vibration. Keep suspension components clean and free of debris. Consult a bike mechanic for complex suspension adjustments or repairs.
Figure 9: Dual Suspension System for improved control and comfort. - General Cleaning: Clean the bicycle regularly with a damp cloth and mild soap. Avoid using high-pressure washers directly on electrical components.
Troubleshooting
This section addresses common issues you might encounter with your Aairsk GT900 Electric Bicycle.
| Problem | Possible Cause | Solution |
|---|---|---|
| Bike does not power on | Battery not charged, battery not properly installed, loose electrical connection, power button issue. | Ensure battery is fully charged and securely installed. Check all visible electrical connections. Press and hold the power button firmly. |
| Motor not assisting/engaging | Low battery, assist level set to zero, sensor issue, motor connection. | Check battery level and charge if low. Increase pedal assist level on the LCD display. Ensure all motor connections are secure. |
| Short range on a full charge | Tire pressure too low, riding in high assist/throttle mode constantly, heavy load, cold weather, battery degradation. | Check and inflate tires to recommended pressure. Utilize lower assist levels or pedal more. Reduce load if possible. Battery performance can be affected by temperature. |
| Brakes feel weak or noisy | Worn brake pads, contaminated rotors, loose caliper, air in hydraulic system (if applicable). | Inspect brake pads for wear and replace if needed. Clean rotors with disc brake cleaner. Ensure caliper bolts are tight. For hydraulic brakes, bleeding may be required by a professional. |
| Gears are not shifting smoothly | Derailleur misalignment, stretched cable, dirty chain, bent hanger. | Clean and lubricate the chain. Check derailleur alignment. If issues persist, professional adjustment may be needed. |
For issues not listed here or if troubleshooting steps do not resolve the problem, please contact customer support.
Specifications
| Feature | Detail |
|---|---|
| Model Number | Aairsk GT900 |
| Certification | CE |
| Motor | 250W Peak Brushless Motor, 60 N.M Max Torque |
| Max Speed | <25 km/h |
| Battery | 36V 13AH Lithium Battery (468Wh) with BMS |
| Charging Time | 5-6 hours |
| Range per Power | 30-40 km (Throttle Mode), 40-60 km (Pedal Assist Mode) |
| Riding Modes | Classic Bike Pedal Mode, Throttle Mode, 5-Level Pedal Assist Mode |
| Gears | Shimano 21-Speed |
| Brakes | Front and Rear Dual Disc Brakes |
| Suspension | Dual Suspension System (Front Fork and Rear Shock) |
| Frame Material | Carbon Steel |
| Wheel Size Options | 24 inch, 26 inch |
| Tires | 1.95" Wider Tires (Kenda brand) |
| Rated Passenger Capacity | One Seat |
| Max Load Capacity | 330 LBS |
| Bicycle Weight (26 inch) | 57.3 LBS |
| Recommended Height (26 inch) | 61.5 - 73 inches |
| Bicycle Weight (24 inch) | 52.9 LBS |
| Recommended Height (24 inch) | 60 - 70 inches |
| Origin | Mainland China |
Dimensions (Approximate)
Refer to the diagrams below for approximate dimensions for both 24-inch and 26-inch models.
User Tips
- Sizing for Younger Riders: The 24-inch model may be suitable for younger riders, such as a 10-year-old, depending on their height. Always refer to the recommended height specifications (60-70 inches for 24-inch model) and allow the rider to test the fit for comfort and control.
Warranty and Support
The Aairsk GT900 Electric Bicycle is CE certified, indicating compliance with European safety, health, and environmental protection standards.
For specific warranty terms, conditions, and customer support, please refer to the documentation provided at the time of purchase or contact your seller directly. Keep your proof of purchase for any warranty claims.