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Results found in several dictionaries: Collins, Collaborative Dictionary
ciclismo   sm cycling 
 ciclismo de montaña mountain biking 
 ciclismo en ruta road racing

Collaborative Dictionary     Spanish-English
ciclismo de montaña pref. mountain biking Reverso General Dictionary 
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'ciclismo' also found in translations in English-Spanish dictionary
mountain biking n. el ciclismo de montaña Reverso General Dictionary 

"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"