This dissertation investigates social implications of built environment interventions (BEI) related to bicycle urbanism from a Spatial Justice (Soja, 2010) perspective. By combining urban spatial theory and mobilities research, the novel theoretical framework Mobility Space helps to analyse spatial, experiential and discursive aspects of urban mobility priorities concomitantly and is thus an adequate analytical tool to uncover how recently proliferating cycling strategies impact society through an alteration of urban space. A qualitative and multi-method research design combines descriptive mapping, virtual site observation and semi-structured interviews to apply Mobility Space to the controversial Mini-Holland programme in Waltham Forest, London. Examining in detail the Walthamstow Village scheme, the research finds three patterns by which BEI related to bicycle urbanism re-organize movement, re-allocate space and re-design public realm to prioritize active travel and dwelling while discouraging car use. Those spatial alterations shift the political organization of space which in turn affects the Right to the City (Lefebvre et al., 1996) – an expression of Spatial Justice – as it enables a greater diversity of people to use urban space (right to appropriation) and makes them conscious how the space they inhabit is discursively produced and the outcome of contentious decision-making processes (right to participation). This research is relevant for urban professionals as environmental as well as pandemic-related urban mobility challenges necessitate a transformation of urban space to accommodate cycling, but negative outcomes for social equity, as resulting from car-urbanism, need to be avoided.