But the visibility of bikes in the protests also reflects a larger trend. In 2020, we are experiencing what is likely the greatest bicycle boom in at least a half century. Several factors have contributed to the bicycling revival, but the spectre of climate change and other crises gripping the globe are certainly part of the equation. In an ecologically imperiled, rapidly urbanizing, traffic-shackled twenty-first century, the zero-emissions two-wheeler has reëmerged as a darling of urbanists, policymakers, and commuters. The boom has transformed American cities with new bicycle infrastructure, bike-share programs, and other pro-cycling initiatives.