Factory Museum II Birdcage (1994) A spaceframe, linkage frontsuspension (see delilah), unified rear triangle , and a completely adjustable steering geometry and suspension. The steering lock to lock was unfortunately rather limited, and the tops of the forktubes are exactly at kneecapheight ()-:) Son of Birdcage (1995) Again a spaceframe, but now with an bought-in suspension fork and a repositioned pivot for the rear suspension.  You can recognize quite a few details which have reappeared in  Roughrider!