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The gear controls on a time trial bike (TTT) play a crucial role in managing the rider's speed and pace during the race. Here are their functions, characteristics and associated standards:

Function :

Shifters allow the rider to change gear ratios to adapt to varying terrain and racing conditions. By adjusting the gears, the cyclist can optimize their effort and maintain an efficient pedaling cadence to maximize their speed throughout the event. In the specific context of time trials, where every second counts, the gear controls must offer maximum precision and responsiveness to allow the cyclist to fully exploit their power.

Features :

1. Ergonomics:

Shifters for CLMs are often designed to provide optimal ergonomics, allowing the rider to make quick and precise gear changes while maintaining an aerodynamic position. They are often contoured to seamlessly integrate with handlebar extenders used in CLMs, providing easy access to controls without compromising aerodynamics.

2. Weight:

In the quest for maximum performance, shifters for CLMs are typically made from lightweight materials such as aluminum or carbon to minimize the overall weight of the bike. Reduced weight helps reduce unsprung mass and improve the overall responsiveness of the bike.

3. Precision and responsiveness:

Shift controls for CLMs must provide maximum precision and responsiveness, allowing the rider to make quick, smooth gear changes without loss of power. This ensures that the rider can always find the optimal gear ratio to maximize their speed on the course.

4. Compatibility:

Shifters must be compatible with the bike's drivetrain system, including the type of rear derailleur used (mechanical or electronic) and the number of speeds on the cassette. It is essential to choose shifters compatible with the specific transmission system of the bike to ensure optimal operation.


Standards for gear controls may vary depending on the manufacturer and the type of transmission used (mechanical or electronic). Some of the main standards include:

- STI (Shimano Total Integration):

An integrated shift and brake system developed by Shimano, which allows the rider to control the gears and brakes from the same lever.

- DoubleTap (SRAM):

A shift control system developed by SRAM, which uses one lever for upshifts and another lever for downshifts, providing intuitive and ergonomic operation.

- Di2 (Shimano) / eTap (SRAM):

Electronic transmission systems that allow precise and rapid gear changes via electronic rather than mechanical controls.

In summary, shifters for time trial bikes are designed to provide optimal ergonomics, lightness, maximum precision and responsiveness, while being compatible with the bike's drivetrain system to ensure optimal performance during the race.