Abstract: A solar radiation collector system includes a curved rim, a collector assembly including a plurality of solar radiation transducer elements passing through the plane of and connected to the curved rim, and a plurality of relatively small diameter tension members connected in distributed manner between the curved rim and the collector assembly and forming a stiff, lightweight, bicycle wheel-type tension-compression support structure. The support structure is rotatably supported from the ground in a manner to allow for three dimensionally stable support and rotation of at least ninety degrees with respect to the ground. Rotation of the bicycle wheel-type tension-compression support structure provides for a desired primary tracking motion to adjust for the apparent motion of the sun, and movement of the transducer elements provides for a second dimension adjustment for the apparent motion of the sun.