This thesis provides an insight into the role of dockless shared-bikes (Mobike) in Delft. The objective of is to fill the knowledge gap about the users of shared-bicycles and their motivations to use shared-bikes in Delft. A survey is and finally gained 91 useful results. 76% of respondents are students, and in general, people are highly educated. 46% of respondents are commuters who work/study in Delft, 5% are tourists, and the other half are living in Delft. Most of the Delft’s inhabitants also own a bike; they are classified as ‘casual’, occasional Mobike users with the main reason to use Mobike as a temporary replacement for their own bike. Most of the commuters, who live outside of Delft, do not own a bike in and use Mobike every (week)day. Their main motivator to use Mobike is out of convenience. All this information finally leads to the main conclusion about the role of dockless shared-bike in sustainable mobility in Delft. From this research, it turned out that 98% of Mobike trips is replacing trips made with other sustainable transport modes such as walking, other forms of cycling and public transport.