Two sizes, on purpose.
A 29-inch wheel up front and a 27.5-inch at the back, both on 2.5-inch knobby tyres, set up tubeless.
Big in front, quick behind.
The bigger front wheel rolls over roots and rocks. The smaller rear keeps the back of the bike lively in turns.
The rubber.
0in
Wide, for grip and comfort.
Knobby
Deep knobs for loose and wet ground.
Tubeless
No inner tubes, so you can run lower pressures.