How to Say "main group" in Spanish
The Spanish word for “main group” is “pelotón” — B2 level. This is a very common word in everyday Spanish.
English → SpanishB2
nounB2
general sports terminology

Examples
El ciclista logró mantenerse con el pelotón a pesar del fuerte viento.
The cyclist managed to stay with the peloton despite the strong wind.
El líder de la carrera se despegó del pelotón en el último ascenso.
The race leader broke away from the pack on the final climb.
Specialized Terminology
When talking about cycling, 'pelotón' specifically refers to the large, main cluster of riders who benefit from drafting (riding close together to save energy).
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