New research from New Jersey shows huge gaps in the conventional wisdom about how to make biking useful to more people.It’s one of the most rigorous explorations of the fact that the assumptions and practices of biking advocacy have been disproportionately shaped by the white and the well-to-do.Moreover, people of color report barriers to biking that are discussed far less often by bike-promotion pros. After fear of traffic collision, the most common was “fear of robbery/assault,” with 30 percent listing this as a barrier. Another 20 percent listed the related “fear of being stranded,” enough for it to rank fourth.