>>962969Triples only come on really low end MTB's or hybrids. MTB's used exclusively for trails usually run 2x or 1x. Triples are too dangerous and really unnecessary for real mountain riding in my opinion, stay off the pavement and fire roads if you "need" a triple on a MTB.
It's ~90% 1x on high end XC and Enduro bikes these days, many frames don't even have front derailleur mounts. With a 42-50t granny gear in the back you only really need to run 1x up front.