Assertion: mountain bike | /r/HasProperty | specialized
Facets:
value: for use on mountain trails
type: PURPOSE
value: generally
type: DEGREE
value: single track,
type: OTHER
Source sentences:
text: Mountain bikes are generally specialized for use on mountain trails, single track, fire roads, and other unpaved surfaces, although perhaps[original research?]
text: The first mass production mountain bike was the Specialized Stumpjumper, first produced in 1981.