Traditional cycling advocacy has focused on physical infrastructure: our study of the social tools to increase cycling participation has identified an important alternative and addition to this aim. Mobilizing marginalized communities to take up cycling for transportation reduces costs, congestion, and pollution while enhancing users’ mobility. Bike Host is a cycling mentorship pilot project originally delivered by CultureLink and Cycle Toronto. We helped to refine and tailor the approach by using evidence based tools derived from the social psychology literature on engagement and behaviour change. We first studied this program in 2013 and the results were so impressive we both increased the numbers and refined and expanded our data collection techniques in order to confirm our results. In 2014, we grew the numbers of participants in the program by focusing intensive recruitment in Toronto's downtown eastside, especially within St Jamestown. We would like to thank the Metcalf Foundation for their generous support of this research and program expansion.