Objective: This study aimed to explore the motives of young people in multicultural suburbs for participating in youth-centre activities. Design and setting: The study employed practice-based research with a focus on collaboration and methodological diversity. Data on motives for participation were collected in spring 2013 at two non-governmental organisation (NGO)-run youth centres located in the suburbs of two cities in Sweden using surveys and focus-group interviews. Method: The study used mixed methods, with qualitative data being used to help explain initial quantitative findings. Statistical analysis was conducted using measures of competence and social motives. Qualitative analysis used both deductive and inductive content analysis. Results: Study findings suggest that motives concerning competence development and socialising are insufficient to account for why young people in multicultural, socially disadvantaged suburbs participate in youth-centre activities. The study highlights the importance of additional motives influencing participation in leisure-time activities. The additional motives of "fun/undemanding" and "support" were found to be important to most young people in this study. Conclusion: Study findings suggest that motives for participation in youth-centre activities have to do with characteristics of the participants, of the neighbourhood in which the centre is located and the specific type of unstructured leisure-time activity. Future motive measurement scales should include items concerning socioeconomic status, activities provided and young people's degree of influence over the activities in which they participate.