Aairsk Electric Bike GT900 User Manual

1. Product Overview

The Aairsk GT900 Electric Bike is a versatile electric mountain bicycle designed for adults and teens, offering a blend of power, range, and comfort. It features a robust 400W motor, a removable 10Ah/13Ah battery, and dual suspension for a smooth riding experience. With 21 speeds and multiple riding modes, it's suitable for daily commutes and leisurely rides.

Figure 1: Aairsk GT900 Electric Bike, showcasing its full frame, wheels, and integrated display.

2. Key Features

• Powerful Motor: Equipped with a 400W hub motor (750W peak) capable of reaching speeds up to 25 mph and climbing 20° slopes.
• Removable Battery: Features a 36V 10Ah/13Ah lithium-ion battery, providing a range of up to 40+ miles in pedal-assist mode. The battery includes a BMS (Battery Management System) for 14 types of protection.
• Multiple Riding Modes: Offers three distinct riding modes:
  • PAS Mode (Pedal Assist): Provides moderate power assistance with 1-5 adjustable levels.
  • Pure Electric Mode: Utilizes the motor for propulsion without pedaling.
  • Pedal Mode: Functions as a traditional bicycle without electric assistance.
• Advanced Suspension: Adjustable carbon steel front fork with rebound and lock functions, complemented by dual suspension for enhanced comfort over varied terrain.
• Reliable Braking: Dual mechanical disc brakes ensure effective stopping power in diverse weather conditions.
• Smart Display: Integrated LCD screen provides essential riding data and allows for mode adjustments.
• Durable Construction: Sturdy triangular high-carbon steel frame designed for durability and stability.
• Safety Features: Includes 36V bicycle headlights and a rear bicycle reflector for improved visibility during night riding.

Figure 2: Illustration of the three working modes: Bicycle Mode, Pedal Assist Mode (5 Speed Gears), and Throttle Mode.

3. Assembly Instructions

The Aairsk GT900 electric bike comes 90% pre-assembled. Please follow these steps carefully for the remaining assembly. Refer to the installation video for visual guidance.

1. Unpacking and Accessory Check: Carefully remove the bike and all components from the packaging. Verify that all accessories listed in the packing list are present and undamaged. Remove all protective foam and zip ties.
2. Front Wheel Installation:
   • Remove the protective cap from the front fork.
   • Align the front wheel with the fork, ensuring the brake rotor slides correctly into the brake caliper.
   • Insert the quick-release skewer through the wheel hub and tighten it securely.
   

   Figure 3: Close-up of the front wheel installation, highlighting the disc brake and quick-release mechanism.

3. Headlight Installation: Attach the front headlight to the designated mounting point on the front fork using the provided screws and tools. Ensure it is securely fastened and facing forward.
4. Handlebar Installation:
   • Remove the protective foam from the handlebar and stem.
   • Position the handlebar into the stem clamp.
   • Tighten the stem bolts evenly to secure the handlebar. Ensure the handlebar is centered and straight.
5. Rear Rack Installation (if applicable): If your model includes a rear rack, attach it to the designated mounting points on the rear frame using the provided hardware. Ensure all screws are tightened for stability.
6. Pedal Installation:
   • Identify the left (L) and right (R) pedals.
   • The "R" pedal is installed clockwise on the right crank arm.
   • The "L" pedal is installed counter-clockwise on the left crank arm.
   • Tighten pedals securely with a wrench.
7. Final Checks: Before riding, double-check all bolts and quick releases for tightness. Ensure tires are inflated to the recommended pressure (check sidewall for PSI). Test brakes, gears, and lights.

4. Operating Instructions

4.1 Powering On/Off and Display

To power on the bike, press and hold the power button on the LCD display. The display will illuminate, showing battery level, speed, and assist level. To power off, press and hold the power button again.

Figure 4: The smart LCD screen displaying speed and battery information, along with the 7-speed Shimano shifter.

4.2 Riding Modes

The Aairsk GT900 offers three riding modes:

• Pedal Mode: Ride the bike like a traditional bicycle. No electric assistance is provided.
• Pedal Assist System (PAS) Mode: The motor provides assistance as you pedal. Use the '+' and '-' buttons on the display to adjust the assist level from 1 to 5, with 5 being the highest assistance.
• Pure Electric Mode (Throttle): Twist the throttle grip on the right handlebar to engage the motor without pedaling. This mode provides full electric power.

4.3 Gear Shifting

The bike is equipped with a 21-speed Shimano gear system. Use the shifters on the handlebars to change gears according to terrain and desired speed. Shift smoothly to avoid strain on the drivetrain.

5. Maintenance

• Battery Care:
  • Charge the battery fully before first use.
  • Charge regularly, even if not used frequently, to maintain battery health.
  • Avoid fully discharging the battery.
  • Store the battery in a cool, dry place.
• Tire Pressure: Regularly check and maintain tire pressure as indicated on the tire sidewall. Proper inflation improves efficiency and prevents punctures.
• Brakes: Periodically inspect brake pads for wear and ensure brake levers provide firm and responsive stopping power. Adjust or replace as needed.
• Chain Lubrication: Keep the chain clean and lubricated to ensure smooth gear changes and prolong its lifespan.
• General Cleaning: Clean the bike regularly with a damp cloth. Avoid using high-pressure washers directly on electrical components.
• Fasteners: Periodically check all bolts, nuts, and quick releases for tightness.

6. Troubleshooting

• Bike Not Powering On:
  • Ensure the battery is fully charged and properly seated.
  • Check all electrical connections for looseness.
• Motor Not Assisting:
  • Verify that the bike is in PAS or Pure Electric mode.
  • Check if the battery has sufficient charge.
  • Ensure the throttle (if used) is functioning correctly.
• Brakes Squealing/Ineffective:
  • Inspect brake pads for wear or contamination.
  • Check brake cable tension and adjust if necessary.
• Unusual Noises:
  • Inspect the chain, gears, and wheels for any obstructions or loose components.
  • Lubricate the chain if it sounds dry.

For persistent issues or complex repairs, please contact Aairsk customer support or a certified bicycle mechanic.

7. Specifications

Figure 5: Detailed size parameters and weight specifications for the Aairsk GT900 Electric Bike.

8. Warranty and Support

The Aairsk GT900 Electric Bike comes with a 12-month manufacturer's warranty, which includes free replacement parts and lifetime technical support. For any issues with the bike, please send an email with video or pictures to the manufacturer's customer support.

For returns, please retain the original packaging for one month from the date of purchase.

For further assistance, please refer to the contact information provided with your purchase or visit the official Aairsk website.