This thesis deals with the subculture of mountain biking in Croatia, especially downhill mountain biking, which is characteristic for downhill and enduro disciplines. The paper consists of a theoretical and a research part, in the first part are presented definitions and explanations of terms key to the research. It is described the phenomena of extreme sports, mountain biking and its categories and subculture, with an emphasis on the cycling subculture. The aim of the research is to describe, analyze and present the characteristics of the downhill mountain biking subculture in Croatia. The emphasis is on Zagreb, because the researched subculture is most active in that area. The research is based on qualitative methodology, and the methods of semi-structured interviews with eight participants and observation with participation were used in order to gain the best possible insight into the studied phenomenon. In the implementation, were used a non-probabilistic intentional sample and a snowball sample. The research results show that the population of the researched subculture is becoming increasingly popular, which was greatly influenced by the construction of the Sljeme cable car. It is dominated by the male population ranging from teenagers to fifty-year-olds. Due to the category of extreme sports, members of the subculture constantly deal with injuries while driving but that do not prevent them from continuing to practice this sport. They emphasize the importance of group rides and the team which consider important and necessary for them to engage in downhill mountain biking. Key words: Subculture, Mountain biking, Extreme sport, Risk