Motorcycle frames are progressing to ever-greater use of die-casting, which lends itself equally to aluminum and to it's alu-mag alloys.

These bikes were at one time advertised by showing that the frame could be unaffected by driving a car over it!

The Geometry table suggests that perhaps only one frame size was offered, roughly a 55 or 56cm for the road version.

I have a white one in excellent condition, though it was built up with modest early-eighties components.