These multi-function, broad-based, dual-axle tricycles encourage a child’s participation and socialization. Each bike has numerous adaptations for special needs. Adjustable steering stops prevent the child from making sharp turns. A caliper hand brake and parking brake allows one-sided orientation of controls and secure loading and unloading of the bike. A low-fixed gear drive decreases pedal resistance for children who lack strength. The seat and handlebars are height- and angle adjustable, while the back/hip support stabilizes the torso along with in-line trunk support. The leg calipers and foot sandals prevent scissoring action of legs. A folding frame (except Imp) simplifies transportation and storage. Each tricycle comes with mag wheels except the Tracker, which has spoked wheels.