Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your FMFXTRA Bicycle Quick Release Security Skewers. These skewers are designed to provide an enhanced level of security for your bicycle wheels, making them less susceptible to theft compared to standard quick-release mechanisms. Please read this manual thoroughly before use to ensure proper installation and safe operation.
Safety Warnings
WARNING: To avoid choking hazards, keep this plastic bag away from infants and children. Do not use this bag in cribs, beds, strollers, or playpens.
- Always ensure all components are correctly installed and tightened before riding.
- Regularly inspect skewers for any signs of wear, damage, or loosening.
- Use only the provided quick release wrench for tightening and loosening the skewers.
- Improper installation or use can lead to wheel detachment and serious injury.
Package Contents
Your FMFXTRA Bicycle Quick Release Security Skewers package should contain the following items:
- 1 x Short Quick Release Skewer (typically for front wheel)
- 1 x Long Quick Release Skewer (typically for rear wheel)
- 1 x Quick Release Wrench (security key)
Specifications
| Feature | Description |
|---|---|
| Rod Length (Short) | 14.8 cm / 5.83 inches (typically for front wheel) |
| Rod Length (Long) | 18.4 cm / 7.24 inches (typically for rear wheel) |
| Weight | 0.13 kg (approximate package weight) |
| Use | Mountain Bikes, Road Cycling |
| Security Mechanism | Pentagonal security screw (requires special wrench) |
Setup and Installation
Note: Before purchasing or installing, please confirm if your bicycle is compatible to avoid being unusable!
-
Distinguish Front and Rear Skewers:
The 14.8cm short rod is typically used for the front wheel. The 18.4cm long rod is typically used for the rear wheel. Please select the corresponding specification of quick release skewer based on the wheel hub center length.
-
Insert the Quick-Release Rod:
Insert the quick-release rod through the hub axle, ensuring that the spring, dust cap, and other components are properly installed. The narrow end of the spring should face the hub, and the wide end should face the quick-release handle.
-
Insert the Wheel Group:
Place the wheel group into the bicycle frame, aligning the nuts at both ends of the quick-release lever with the mounting slots on the frame dropouts.
Operating Instructions
-
Clamp and Lock Tightly:
Use the provided quick release wrench. Move the wrench from the open position (perpendicular to the frame) to the clamping position (parallel to the frame) and tighten clockwise until secure. Ensure the wheel is firmly seated and does not wobble.
Image: Close-up view of the black skewer end, showing the pentagonal security interface and the matching quick release wrench. 
Image: Close-up view of the red skewer end, showing the pentagonal security interface and the matching quick release wrench. -
Disassembly:
When disassembling, use the quick release wrench to rotate counterclockwise on the nut until the skewer is loose enough to remove the wheel.
Adjusting Clamping Force:
- Clockwise rotation: Increases clamping force.
- Counterclockwise rotation: Reduces clamping force.
Maintenance
- Keep the skewers clean from dirt and debris. Wipe them down with a clean cloth after riding, especially in wet or dusty conditions.
- Periodically check the springs and nuts for any corrosion or damage. Replace components if necessary.
- Ensure the quick release wrench is stored safely to prevent loss, as it is essential for operation.
Troubleshooting
Difficulty fitting the wrench:
Some users have reported that the wrench can sometimes be faulty or difficult to fit. Ensure the wrench is properly aligned with the pentagonal security screw before applying force. If it consistently struggles to fit, inspect both the wrench and the skewer head for manufacturing defects or damage.
Skewer bending during installation:
If excessive force is applied or the skewer is not properly aligned, it may bend. Ensure the wheel is correctly seated in the frame dropouts before tightening. Apply firm but not excessive force when clamping. If a skewer bends, it should be replaced immediately to ensure safety.
User Tips
- These skewers offer enhanced security against casual theft, as they require a special pentagonal wrench for removal. While they deter random thieves, a determined individual with specialized tools may still be able to remove your wheel.
- The security wrench is unique to these skewers. Consider purchasing a spare set if available, or keep the included wrench in a secure and memorable location, as losing it will prevent you from removing your wheels.
- Always double-check the compatibility of the skewer lengths with your bicycle's hub center length before purchase and installation.
Frequently Asked Questions
No specific FAQs are available at this time. For general inquiries, please refer to the relevant sections of this manual or contact customer support.
Warranty and Support
For information regarding warranty coverage, returns, or technical support, please refer to the seller's policies or contact the retailer where the product was purchased. An additional user manual in PDF format is available for download: