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This article studies a case of convergence around “sustainable mobility” between activist cyclists and owners of small bus fleets in Mexico City; that is, between two sets of individuals from unconnected social worlds, separated not only by the nature of their activities but also by gender and class boundaries. The hypothesis explored is that the understanding of this type of alliances, still seldom-studied in sociology of the environment, requires an approach that is both relational and processual by studying the dispositions and interests of the converging agents in light of their trajectories and prior positions, the mediation that enables them to meet up, and the cognitive bridging produced. It will show how activists and entrepreneurs, who initially occupy homologous positions as “challengers” in their respective milieus, are brought together under the egis of local and international intermediaries and by way of an instrument capable of reconciling their aspirations—specifically, a “Bus Rapid Transit” system (BRT)—, this collaboration leading to the creation of a collective and enabling them to articulate a common cause.