Examples from the Web for two-speed
Two-speed and three-speed gears are now very commonly fitted to cycles.How it Works|Archibald Williams
For the full enjoyment of tandem riding, therefore, a two-speed gear is a necessity, while a three-speed gear is better.
In some two-speed gears the normal is the high speed, in others the low.
This arrangement gives six spindle speeds, and double this number is obtained by using a two-speed countershaft overhead.Turning and Boring|Franklin D. Jones
Fig. 14 is a sectional view of the “Hub” two-speed gear, the chain-wheel or free-wheel clutch being omitted.