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There are four individual wheels, connected only by the gearboxes on each side. Each wheel has a small axle hub that fits into a hole in the black connector piece, a 20-tooth gear, which touches the edge of the gearbox when in place, and a black plastic bearing that is held stationary in the chassis while the axle spins inside it. The wheels are plastic with ridges to hold the tires on. The tires seem to be a soft plastic; they have decent grip but leave a lot to be desired compared to soft rubber bit tires, though these are great for carpet. In the second picture, you can see a Stampeder chassis; their axle, wheel, or tires could be used on the 4x4 with some modification. In the trio of tires at the bottom of the picture, the top left one is a stampeder tire. These are thicker and heavier than the 4x4 tires and seems to be medium-firm rubber. If used, the extra weight might keep the 4x4 from flipping backwards during steep climbs.
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