1. Introduction
Thank you for choosing the ONESPORT OT12 Electric Bicycle. This manual provides essential information for the safe assembly, operation, maintenance, and troubleshooting of your e-bike. Please read this manual thoroughly before your first ride and keep it for future reference. Proper use and maintenance will ensure a long and enjoyable experience with your ONESPORT OT12.
2. Product Overview
The ONESPORT OT12 is a city e-bike designed for comfortable and efficient urban commuting. It features a 250W motor, a 36V 13AH removable lithium battery, and 27.5-inch tires, offering a balance of power, range, and stability.

Figure 1: ONESPORT OT12 Electric Bicycle highlighting 250W motor, 36V 13AH battery, 27.5-inch wheels, and 50-65KM range.
Key Features:
- Motor: 250W Brushless Motor for effortless climbing power.
- Battery: 36V 13AH Lithium Battery, removable for convenient charging, with BMS power-saving technology.
- Range: Up to 65KM per charge (auxiliary mode).
- Speed: Max speed less than 25 km/h.
- Brakes: Reliable 160mm Front and Rear Mechanical Disc Brakes for confident control.
- Gearing: Shimano 7-Speed Gear System for smooth and reliable shifting.
- Tires: 27.5 x 2.25 inch Road Tyres, suitable for various terrains.
- Display: 3-Speed Multifunction Color Display for real-time information.
- Lighting: High-Brightness LED Headlight and Auto-Activated Tail Light for enhanced visibility.
- Frame: Durable Iron Frame with Steel Alloy Front Suspension Fork.
- Waterproof Rating: IPX4.
- Rear Rack: Maximum load capacity of 25 KG.

Figure 2: OT12 E-bike showcasing its urban design and key performance highlights.

Figure 3: Close-up of the color display, battery lock, rear rack, and LED headlight.
3. Setup and Assembly
Your ONESPORT OT12 Electric Bicycle may require some assembly upon arrival. Please follow these general steps. For detailed visual instructions, refer to any included diagrams or videos from the manufacturer.
3.1 Unpacking
- Carefully remove the bicycle and all components from the packaging.
- Inspect for any shipping damage. Report any issues immediately.
- Remove all protective packaging materials.
3.2 Component Assembly
- Handlebars: Attach the handlebars to the stem, ensuring they are centered and tightened securely. Adjust the angle for comfortable riding.
- Front Wheel: Install the front wheel into the fork dropouts. Ensure the quick-release skewer or axle nuts are properly tightened.
- Pedals: Identify the left (L) and right (R) pedals. Thread the 'L' pedal counter-clockwise into the left crank arm and the 'R' pedal clockwise into the right crank arm. Tighten firmly with a wrench.
- Seat Post and Saddle: Insert the seat post into the frame's seat tube. Adjust the saddle height for comfortable pedaling (your leg should have a slight bend at the knee when the pedal is at its lowest point). Secure with the quick-release lever or bolt.
- Fenders and Rack: Attach the front and rear fenders, and the rear cargo rack, if not pre-installed. Ensure all mounting points are secure.
3.3 Initial Checks
- Brakes: Test both front and rear brakes. Ensure they engage smoothly and stop the wheels effectively. Adjust cable tension if necessary.
- Tires: Inflate tires to the recommended pressure indicated on the tire sidewall.
- Battery: Ensure the battery is fully charged before your first ride. Insert the battery securely into its compartment and lock it using the provided key to prevent misoperation and theft.
- Lights: Verify that the LED headlight and auto-activated tail light are functioning correctly.
- Fasteners: Double-check all bolts, nuts, and quick-release levers for tightness.

Figure 4: Recommended rider height (160cm to 200cm) and key bicycle dimensions.
4. Operating Instructions
4.1 Powering On/Off
- To Power On: Ensure the battery is securely installed and locked. Press and hold the power button on the handlebar display until the screen illuminates.
- To Power Off: Press and hold the power button on the display until the screen turns off.
4.2 Using the Display and Pedal Assist
- The 3-speed multifunction color display shows real-time information such as speed, battery level, and pedal assist level.
- Use the '+' and '-' buttons on the display to cycle through the 3 pedal assist levels (1 being the lowest assist, 3 being the highest).
- The motor provides assistance only when you are pedaling. The level of assistance depends on the selected mode.
4.3 Shifting Gears
- The ONESPORT OT12 is equipped with a Shimano 7-speed gear system.
- Use the gear shifter on the handlebars to change gears. Shift to a lower gear for easier pedaling on inclines and a higher gear for faster speeds on flat terrain.
- Always ease off the pedals slightly when shifting gears to ensure smooth transitions and prevent damage to the drivetrain.
4.4 Braking
- The bicycle features front and rear mechanical disc brakes.
- To brake, gently squeeze both brake levers simultaneously. Apply more pressure for quicker stops.
- Practice braking in a safe area to get accustomed to the feel and responsiveness of the brakes.

Figure 5: Mechanical disc brakes provide reliable stopping power.
4.5 Lighting System
- The e-bike is equipped with a high-brightness LED headlight and an auto-activated tail light.
- The tail light automatically activates, providing instant visibility for safer night rides.
- Ensure lights are clean and unobstructed for maximum effectiveness.

Figure 6: Auto-activated tail light for enhanced safety during night rides.
5. Maintenance
Regular maintenance is crucial for the longevity and safe operation of your ONESPORT OT12 Electric Bicycle.
5.1 General Cleaning
- Clean your e-bike regularly with a damp cloth and mild soap. Avoid high-pressure washers directly on electrical components.
- Dry the bike thoroughly after cleaning.
5.2 Battery Care
- Charge the battery fully after each ride, especially if it has been significantly discharged.
- Use only the original 42V 2A charger provided. Charging time is typically 6-8 hours.
- 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 to prevent deep discharge.
- Avoid exposing the battery to extreme temperatures.

Figure 7: Features like 6-8 hours charging time, 42V 2A charger, and 65KM max range.
5.3 Brakes
- Regularly check brake pads for wear and replace them when necessary.
- Ensure brake cables are free from fraying and properly tensioned.
- Inspect disc rotors for damage or warping.
5.4 Tires
- Check tire pressure before each ride and inflate to the recommended PSI.
- Inspect tires for cuts, punctures, or excessive wear.
5.5 Drivetrain
- Keep the chain clean and lubricated to ensure smooth shifting and prevent rust.
- Check the gears and derailleur for proper alignment and function.
5.6 Fasteners
- Periodically check all bolts, nuts, and quick-release mechanisms for tightness. Loose fasteners can lead to unsafe riding conditions.
6. Troubleshooting
This section addresses common issues you might encounter with your ONESPORT OT12 Electric Bicycle.
6.1 Motor Not Assisting
- Check Battery: Ensure the battery is fully charged and securely seated in its compartment.
- Power On: Verify the e-bike is powered on and the display is active.
- Pedal Assist Level: Make sure a pedal assist level (1-3) is selected on the display.
- Brake Levers: Ensure brake levers are not partially engaged, as this can cut power to the motor.
6.2 Battery Not Charging
- Charger Connection: Verify the charger is properly plugged into both the wall outlet and the battery charging port.
- Charger Functionality: Check if the charger's indicator light (if present) shows it's receiving power and charging.
- Battery Temperature: Ensure the battery is not too hot or too cold, as this can prevent charging. Allow it to reach room temperature.
6.3 Brakes Squealing or Ineffective
- Brake Pads: Inspect brake pads for wear or contamination (oil, grease). Clean or replace as needed.
- Rotor: Check the disc rotor for dirt or damage. Clean with disc brake cleaner.
- Cable Tension: Adjust brake cable tension if the levers feel too loose or too tight.
6.4 Gears Not Shifting Smoothly
- Chain: Ensure the chain is clean, lubricated, and not excessively worn.
- Derailleur Adjustment: The Shimano 7-speed derailleur may need adjustment. Consult a bicycle mechanic if you are unsure.
- Cable Tension: Check gear cable tension for proper shifting.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | OT12 |
| Brand Name | ONESPORT |
| Motor | 36V 250W Brushless |
| Battery | 36V 13AH Lithium Battery |
| Voltage | 36V |
| Max Speed | <25km/h |
| Range per Power | Auxiliary 65KM |
| Charging Time | 6-8 Hours (with 42V 2A charger) |
| Frame | Iron Frame |
| Front Fork | Steel Alloy Front Suspension Fork |
| Wheel Size | 27.5 Inch |
| Tire Size | 27.5 x 2.25 Inch Road Tyre |
| Gear Shift | Shimano 7-Speed Gear System |
| Brake | Front and Rear Mechanical Disc Brakes |
| Displays | 3-Speed Multifunction Color Display |
| Rated Passenger Capacity | One Seat |
| Max Rear Rack Load | 25 KG |
| Waterproof Rating | IPX4 |
| Net Weight | 27.8 KG |
| Gross Weight | 34 KG |
| Package Size | 1480mm x 240mm x 800mm |
| Certification | CE |
8. User Tips
- Pre-Ride Check: Always perform a quick check of your brakes, tire pressure, and battery level before each ride.
- Battery Lock: Remember to lock your battery in place to prevent accidental removal or theft.
- Gear and Assist: Experiment with different gear and pedal assist combinations to find the most comfortable and efficient ride for various terrains.
- Safety First: Always wear a helmet and appropriate safety gear. Obey all local traffic laws and regulations.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your proof of purchase handy as it may be required for warranty claims. The product is CE certified, ensuring it meets European safety, health, and environmental protection requirements.
The manufacturer is committed to providing excellent service. For any issues not covered in this manual, please reach out to their customer support team.





