Using a multi-theory approach, the current study was designed to identify gender differences in the psychological mechanisms by which urban adolescents' motivation in physical education transfers into their leisure-time activities. The theoretical frameworks of Self-Determination Theory and the Theory of Planned Behavior were integrated to generate a trans-contextual model. Urban adolescents (N = 837, ages 11-15) completed questionnaires assessing relevant psychological constructs as well as their levels of physical activity during leisure time. Path analysis was used to test the direct and indirect paths of the model. Results support the model tenability and demonstrate its invariance across gender. Although there were several gender-specialized characteristics, perceived competence in physical education was the strongest predictor of leisure-time physical activity for both male and female urban adolescents. The finding suggests that nurturing urban adolescents' autonomy and competence in physical education is important for enhancing leisure-time physical activity intentions and behaviors. (Contains 2 tables and 3 figures.)