All-City Super Professional Urban Cross Machine Built to continue the tradition of All-City's esteemed Macho Man and Nature Boy 612 builds, the Super Professional features the Master Dropout, All-City''s first ever combination geared or single-speed sliding dropout system. Designed to be fast, responsive, agile, and capable on mixed terrain, the Super Professional can be converted from single-speed to geared and back again to crush all your daily deeds and commutes in the city.