mountain bikingn.
/ˈmaʊntᵻn ˌbʌɪkɪŋ/, U.S. /ˈmaʊnt(ə)n ˌbaɪkɪŋ/ The riding of mountain bikes.
ΚΠ
1968 Upland (Calif.) News 10 July The camp activities will include..archery, nature crafts, mountain biking.
1982 Los Angeles Times 24 Aug. v. 7/2 Devotees of a new sport called mountain biking, the Johnsons' bikes are especially intended for rough terrain.
1985 Working Woman June 35/1 Mountain biking gets you out of the gym, off the track and into the wilderness.
1993 Cycling Weekly 16 Jan. 6/3 The biggest problem switching from mountain-biking to cyclo-cross is from fat tyres to 'cross tyres.
2000 What Mountain Bike Winter 37/1 Mountain biking is a killer for causing muscle and ligament gridlock.
This is a new entry (OED Third Edition, March 2003; most recently modified version published online March 2022).
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n.1968