I run 27.5×2.35 Schwalbe’s on my Commencal Meta HT and it’s great
You’re meant to run 29×2.35 or 27.5×2.8 but I bought it as a frame only, originally planning to get the correct wheels/tyres later, but I can’t really see the point now I’ve been riding it like this for the past 6 months and reckon it’s just fine.
I probably will try some different wheels/tyres eventually, but they’d have to be a massive bargain.
It doesn’t seem particularly low (although I haven’t measured it), but it is a hardtail so may be less affected by lowering the BB by 15mm or so.
170mm cranks if you’re interested too