A thru axle (also known as a thru axle system) is a special type of axle system used in various vehicles, particularly bicycles and mountain bikes . Unlike traditional quick releases, which secure the wheel with a quick release nut, the thru axle uses an axle permanently attached to the frame or fork that is secured by a locking mechanism.

Here are some features and benefits of thru axles:

1. Stiffness : Thru axles typically offer greater stiffness compared to traditional quick releases. This can improve steering precision and handling, especially on mountain bikes, which are often subjected to extreme loads.

2. Safety : Thru axles provide a more secure attachment of the wheel to the frame or fork. This can be especially important when the bike is used on challenging routes or rough terrain.

3. Accuracy and repeatability : The use of a thru axle allows for more precise positioning of the wheel in the frame. This can be important when it comes to repeatability of adjustments during different maintenance operations or when the wheel is removed and reinstalled.

Thru axles are available in a range of diameters and lengths, and the exact specification can vary depending on the bike type and manufacturer. They are often used in high-end mountain bikes, road bikes , and other specialized bikes.

What should be considered when purchasing a thru axle?

• Compatibility: When purchasing a thru axle, it is crucial to pay attention to compatibility with the bike frame and fork. The diameters and lengths of thru axles vary, so it is important to choose the right model for your bike.
• Installation: Although installing a thru axle is usually straightforward, you should make sure it is installed correctly and securely to ensure maximum performance and safety.
• Maintenance: Regularly checking your thru axle for wear and damage can help maintain the longevity and functionality of your bike.

alternatives

• Quick release: A simpler and more widely used alternative, but does not offer the same rigidity and safety as a thru axle.
• Screw axles: Provide a solid connection but require tools for assembly and disassembly.