The objective of this article is to better understand the linkage between the residential anchorage of adolescents living in segregated neighbourhoods and their urban mobility practices. The subjects we have chosen for this are working-class and middle-class adolescents living in Sensitive Urban Areas (SUA) of Greater Paris. The use of statistical and ethnographical materials and of semi-structured interviews allows us to demonstrate that SUA adolescents have a lesser mobility potential than do other adolescents, but that the fact of living in a segregated neighbourhood does not necessarily mean that they avoid exploring the rest of the city.