Assertion: hub gear | /r/ObjectUse | used on bicycle
Facets:
value: by the 1930s
type: TEMPORAL
value: over the world
type: LOCATION
value: commonly
type: TEMPORAL
Source sentences:
text: A hub gear, internal-gear hub,, internally geared hub or just gear hub is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears.
text: By the 1930s, hub gears were used on bicycles all over the world.