mountain bikern.
/ˈmaʊntᵻn ˌbʌɪkə/, U.S. /ˈmaʊnt(ə)n ˌbaɪkər/ A mountain-bike rider.
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society > travel > transport > cycling > [noun] > cyclist > on other specific type of bicycle
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mountain biker1984
1984 Washington Post 21 May d2/3 Mountain bikers follow preexisting trails over mountains or across valleys.
1994 Beautiful Brit. Columbia Fall 38/1 Today, the KV's route through the Okanagan Highland is crawling with hikers, mountain bikers, 4x4s, horseback riders all poking around the old railbed.
2000 J. Friel (title) The mountain biker's training bible: a complete training guide for the competitive mountain biker.
This is a new entry (OED Third Edition, March 2003; most recently modified version published online March 2022).
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n.1984