From early on, reflexive governance approaches have been problematised for lacking explicit consideration of formal governance and decision-making structures. Developed over two decades ago, transition management is not an exception; it has been specifically critiqued for being democratically illegitimate and depoliticising issues. Contributing to these debates, this article develops a legitimacy framework for understanding how transition management practices can be legitimised within liberal democratic structures, while safeguarding their transformative potential, or, 'radical core', while navigating innovation capture. This framework guides a comparative analysis of six European cities, who employ transition management practices for developing decarbonisation roadmaps towards 2050. We discuss the emphasis on liberal democratic norms, the fuzziness of practices of participation and the closing down of policy options. We recommend the legitimacy framework to be used as a heuristic for reflexive governance, tool for explicating the conditionality of 'radicality' in transition management, and guide for designing accountability governance structures.
