The figure shows the torque delivery map of a reciprocating engine, coupled to a geometrically stepped four-speed transmission. The gaps between the torque transfer of two successive gears and the power hyperbola for maximum engine output which cannot be driven as operating points, are of the same size for all gear ratios.
The geometric transmission is widely used in commercial vehicles. Due to the comparatively unfavorable weight-to-power ratio, equal velocity ranges have to be considered for all gears for the transmission layout.