Obscured by its apparent simplicity, cycling is a complex phenomenon. Being an almost perfect human-machine hybrid, cycling is deeply rooted in a plethora of socio-technological systems. Around the world cycling is embraced as an important ingredient to tackle a wide variety of individual and societal challenges. The Netherlands is often seen as an ideal living lab, because cycling has retained its significant share of mobility throughout the country. At the same time, there are large differences in developments across time and space, that allows for a better understanding of potential causal relations. This is also increasingly recognized by (inter)national top tier researchers from many different academic fields. They are uncovering reciprocal relations of cycling with spatial, ecological, historical, social, cultural, economic, biological and political structures. Unraveling the Cycling City bundles the state-of-the-art knowledge that emerges from research and practice on the Dutch cycling system. As such, it provides an easily accessible platform to learn about important causes and effects, to open minds for the complexity of the entire system and to support group deliberations around the world.