Which cycling niche ultimately favored the external derailleur system over the internal hub gear?

Answer

Racers, due to the requirement for the lightest possible weight and the widest gear range.

The comparison between the two major systems shows they carved out distinct niches based on their inherent trade-offs. While the internal hub offered superior protection and robustness suitable for daily commuting where maintenance was a concern, the external derailleur system, despite being more susceptible to dirt and damage, allowed for a significantly wider variety of gear ratios combined with a lighter overall weight. For racing applications, where maximizing speed range and minimizing mass were paramount priorities, the derailleur eventually became the dominant choice, even if it required mechanics for frequent tuning.

Which cycling niche ultimately favored the external derailleur system over the internal hub gear?
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