Wind deflector assemblies for an opening of a vehicle roof having a plurality of pretensioned movable arms. In one approach, a wind deflector assembly for a vehicle having a roof opening, is provided having a wind deflector guide attached to a vehicle along a front edge of the roof opening in a generally transverse axis of the vehicle on its lower edge; the wind deflector guide extendible above the roof opening by attachment on its upper edge to a plurality of movable deflector arms mounted to and extending rearward along a generally longitudinal axis of the vehicle; the plurality of movable deflector arms having an pretensioning element to extend the wind deflector guide from a retracted position to a deployed position. The plurality of movable deflector arms can be two reciprocal assemblies of three deflector arms, each assembly movable on four pivot mounts.