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Here is a description of the function, characteristics and standards of a pump track MTB derailleur:

Function :

The derailleur on a pump track mountain bike performs the same function as on any other mountain bike: it allows you to change speed by moving the chain from one cog to the other at the rear. This allows the cyclist to adapt the pedaling resistance depending on the terrain and speed. On a pump track mountain bike, the derailleur must be robust and reliable to withstand the stresses encountered during fast turns, jumps and pump sections.

Features :

1. Robustness:

Pump track MTB derailleurs are designed to be extremely robust to withstand the repeated shocks and vibrations encountered on the track. They must be able to withstand the stresses exerted during jumps and landings.

2. Chain stability:

As with other mountain biking disciplines, chain stability is important to avoid derailments during fast turns and jumps. Pump track MTB derailleurs can be equipped with chain stabilizing devices to keep the chain in place even in the most extreme conditions.

3. Responsiveness:

Pump track MTB derailleurs must offer quick and precise gear changes to allow riders to adjust their speed quickly depending on the sections of the track. They must be responsive to the rider's movements to ensure optimal performance.

4. Simplicity:

Pump track mountain bikes are often equipped with simple drivetrains, with a single chainring at the front and a cassette at the rear. Pump track MTB derailleurs are therefore often simple, no-frills designs designed to operate reliably in extreme conditions without requiring much maintenance.

Standards:

Pump track MTB derailleurs generally follow MTB industry standards for compatibility with cassettes, chains and shifters. This includes standards such as mounting interfaces, maximum yoke clearances, and speed ratios.

In summary, a pump track MTB derailleur must offer robustness, chain stability, responsiveness and simplicity to meet the unique demands of this discipline, while remaining compatible with other components of the transmission system.