Tonight, Manhattan alt-energy axis Solar One hosts the seventh go-around of Bike Shorts. Planted alongside the whirligig that is FDR Drive, the environmental venue is the perfect oasis-in-the-desert to lure the ten-speeds and fixed-gears over bridges for the first time (the previous six powwows went down in Brooklyn). With its call to cameras, the series offers cycle-centered moving pictures that are made by riders and voted on, with appropriate egalitarianism, by an enthusiastic audience. Come to kvetch about automotive etiquette or to take a picturesque water break by the East River.