Abstract: A variable speed transmission is disclosed wherein two convergent, conical gear trains simultaneously increase in circumference such that the parallel expansion of the convergent gear trains produces a corresponding efficiency increase which constitutes a principle of operation for the generation of ratios. A Driven Shell having convergently disposed input Gears is driven by the gears such that the Driven Shell and Input Gears form the set of convergent cones.A shifting means comprising a Shifting Control Slide is tracked to a fixed, Stabilizing Shaft disposed within a hollow, Helical Control Drum.