mountain bike

ˈmoun•tain ˌbike, n. [countable]

Transport, a bicycle designed for use on unpaved or hilly roads, having a sturdy frame and wider tires than a standard bicycle.

moun•tain bik•er, n. [countable]
moun•tain bik•ing, n. [uncountable]

moun′tain bike′,

Transport, a bicycle designed for off-road use, typically having a smaller and sturdier frame and smaller and wider tires than a standard bicycle.

moun′tain bik′er.
moun′tain bik′ing.

moun′tain bike′,

Transport, a bicycle designed for off-road use, typically having a smaller and sturdier frame and smaller and wider tires than a standard bicycle.

moun′tain bik′er.
moun′tain bik′ing.

Collins Concise English Dictionary © HarperCollins Publishers::

mountain bike n

a type of sturdy bicycle with at least 16 and up to 21 gears, straight handlebars, and heavy-duty tyres

'mountain bike' also found in these entries (note: many are not synonyms or translations):

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