"Sustainable mobility" policies in contemporary cities try to provide moral or material incentives to reduce vehicle congestion and pollution by using active transport modes in preference to private vehicles. Sustainable mobility planning also provides better infrastructure for pedestrians, bikes, and public transport, as a form of supply-side urban investment. This chapter focuses on a hitherto understudied aspect of bicycle justice, namely efforts to establish and run "community bike workshops" or "ateliers vélo collectif" using one European city, Brussels, as an example. These are autonomous and self-help initiatives that are largely "invisible" to mainstream engineers and planners because they are bottom-up, rarely sanctioned by governments, occasionally edgy and anarchic, traverse gender and racial identity, and they are part of an ever-shifting not-for-profit transport sector. Bicycle justice includes the actions of community bicycle workshops. They are part of a global movement, particularly strong in Europe, which includes radical citizen-led and more mainstream sustainable transportation solutions.