Abstract: A frame system for a fold down top for vehicles includes first and third generally rectangular-shaped perimeter frame members and a second U-shaped frame member. In the frame system's open position, the first frame member is pivotedly connectable along its transverse lower end portion to the vehicle about a first axis in a generally upright position. The second frame member, parallel to the first frame member, is also pivotedly connected along its transverse midportion about a second axis which is rearwardly positioned from the first axis. The third frame member is horizontally positioned having its forwardly end portion forwardly disposed over the front portion of the passenger compartment of the vehicle. The third frame member is pivotedly connected along its rearwardly end portion to the second frame member about a third axis and also pivotedly connected to the first frame member and about fourth axis.