Assertion: hub gear | /r/CapableOf | internal running in an oil bath
Facets:
value: for greater mechanical efficiency
type: PURPOSE
Source sentences:
text: The 11-speed Shimano Alfine 700 hub gear, introduced in 2010, has a gear range exceeding 4 to 1, comparable to 20-speed derailleur drive-trains, and internals running in an oil bath, for greater mechanical efficiency.