The Superform was arguably the world's first purpose built triathlon model. Prior to it, all the so called "triathlon " models were just repurposed mid-range sports bicycles. The big innovation of the Superfrom was the steep seat tube angle, which was around 80 degrees, depending on the frame size. Basically, this rotated the body forward about the pedal spindle. This rotation lowered the torso, to achieve a more aerodynamic position and allow the use of aero bars without constricting the critical angle between the torso and thigh, which happened with a conventional seat tube angle. The design did comprise the bio-mechanical efficiency a bit but was more than offset by the increased aerodynamic efficiency and it also decreased the adaptation period for the legs at the beginning of the run segment.

650C were originally used on the Superform to allow a shorter top top to accommodate women, who made up a very large segment of competitive triathletes. However, they are also lighter and more areodynamic. The main cause of aerodynamic drag are the spokes. On 650C wheels the spokes are shorter and the smaller wheel is stronger, allowing the wheel to built with less spokes.

It's my understanding the the early Superforms were built by Tom Teasdale.