The Behemoth, Mammoth, and Lunchbox are designed for tires ranging from 2.4″ to 3.0″. Any tires in that range work great. You can order any of these bikes as a 27.5 or 29er or a mullet (27.5 rear and 29 front)
The Fatillac is a little more complicated. With a 27.5x50mm wide rim, the max tire size is 27.5×3.8″ . With a 65-80mm wide rim, a 27.5×4.0″ is the max tire size. The Fatillac will also work with a 29×2.4″ to 3.0″ tire.
The Sesh works with a 27.5×2.4″ to 3.0″ tire.