Wheel (cgcookie exercise submission)

3D Model

So I used modifiers for pretty much everything.

Every object is a strip of quads with a solidify modifier applied to it.

The tire itself is a circular strip of triangles, made by deleting the sides of a cylinder. Then I applied Solidify and Bevel modifiers to get its full shape.

At the center of it is a circle with solidify and subsurface modifier applies to it.

The spokes are quads, from which a longer strip of quads also are extended to make out the inside of the rim. These are then duplicated and rotated around the entire inside of the tire using an array modifier with an offset target object at the center, rotated at 60 degrees. And then solidify + bevel to get some kind of smoothness (though the rim is kinda uneven.)

The tracks on the wheel are a small set of quads that are solidified, beveled, arrayed sideways, mirrored and then arrayed to 78 instances and finally wrapped around the wheel using a curve, which is a bezier curve in the shape of a circle.