stock tires are decent....stock wheel foams are not. they are too stiff. if you remove a beadlock ring, pull out the foams and cut a gear or star shape in them then that will make them soft....allowing the tires to form to the rocks and get much better traction.

As far as aftermarket....pretty much an 2.2 crawler wheel and tire will work. You wont really find any that are bigger. Only way to go bigger is to get 12mm to 14mm hex adapters...which would allow emaxx type wheels to work. But they would be much larger and could cause you issues with the driveline.

If you want just a taller tire, the axial wraith tires are a bit taller....but they are only half as wide.