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The rear derailleur on a time trial (or time trial) bicycle is an essential component that plays a crucial role in optimizing aerodynamic performance and drivetrain efficiency during time trial races . Here is a description of its function, characteristics and specific standards for time trial bikes:

Function :

The rear derailleur on a time trial bike essentially performs the same function as on any other bike: it allows you to change gears by moving the chain between the different sprockets on the rear cassette. However, on a time trial bike, the derailleur is often optimized to provide maximum aerodynamic performance while maintaining precise and efficient shifting.

Features :

1. Aerodynamics:

Rear derailleurs for time trial bikes are designed to minimize aerodynamic drag. They can feature thinner profiles and special shapes to reduce air resistance when in the high position on the cassette.

2. Lightness:

As with any other derailleur, lightness is an important factor. Rear derailleurs for time trial bikes are often made from lightweight materials such as aluminum or carbon to minimize weight.

3. Shifting precision:

Despite the emphasis on aerodynamics, rear derailleurs for time trial bikes must offer high shifting precision. This ensures that the rider can make quick and precise gear changes to adapt their effort to the topography of the course.

4. Compatibility with transmission systems:

Rear derailleurs for time trial bikes are typically designed to be compatible with high-end drivetrain systems, such as electronic drivetrains, which provide ultra-precise and fast gear changes.

Standards:

Rear derailleurs for time trial bikes are often designed to be compatible with the same standards as traditional rear derailleurs, particularly with regard to the type of mounting (direct mount, classic mounting), the number of speeds (11 , 12, etc.) and the type of transmission (mechanical, electronic).

However, due to the emphasis on aerodynamics, manufacturers may offer specific designs for their time trial rear derailleurs models, which may vary between brands and product lines.

In summary, the rear derailleur on a time trial bike is optimized to provide maximum aerodynamic performance while maintaining high shifting precision. It is designed to minimize aerodynamic drag and weight while providing fast, precise gear changes for competitive riders.