The paper departs from an analysis of the case of Michelle Dumaresq, a transgender female downhill mountain biker who experienced marginalization within her sport. The analysis is based on Axel Honneth’s theory of recognition. The Dumaresq case is particularly relevant to Honneth’s ideas of solidarity, which provide insight into the dynamics of social integration. Honneth’s theory of recognition also provides a conceptual framework and a methodology that gives new perspectives on the ethical significance of sport. In the paper, an analysis (...) is presented of the lack of solidarity experienced by Dumaresq. The argument is made that sport has a particular potential for realizing solidarity among its practitioners. Realizing solidarity however depends to a large degree upon that the rules of sport are perceived as fair and just. In the Dumaresq case, challenges to solidarity came from what her competitors considered to be unfair classification rules. Summing up, it is argued that, as long as the rules of a spor.. (shrink)