[AlecS]

Zin,

Most WCD's what is called a live axle. In this case, the axle is either hexed or keyed. The sprocket is secured to one side of the shaft and wheel to the other. The wheel and sprocket rotationally locked to each other, so when the Chain spins the sprocket, the wheel also spins. In the picture you showed, sprockets would be located inside the 3 CIM DS and chained to sprockets on the outer wheels. Let us know if you have any more questions.

-Alec