This article presents the preliminary results of a research project on road and mountain cyclists residing in Mexico City. The analytical axes presented are based on the findings gathered during semi-structured interviews with four male cyclists. These axes are their initiation into the sport, their habituation to sport, the places they visit thanks to cycling, and the masculinized socialization that occurs among cyclists. The article is accompanied by a guiding question: Why is someone a sport cyclist? This question is addressed from different sociological perspectives.