Specialized Stumpjumper
... that the Specialized Stumpjumper became the first mass-produced mountain bike when it was first introduced in 1981?
... that the <b id="mwF2U"><a href="./Specialized_Stumpjumper" id="mwF2Y" rel="mw:WikiLink" title="Specialized Stumpjumper">Specialized Stumpjumper</a></b> became the first mass-produced <a href="./Mountain_bike" id="mwF2c" rel="mw:WikiLink" title="Mountain bike">mountain bike</a> when it was first introduced in 1981?