I'll try to get a tutorial put together outlining the techniques I used to create these later this week. I'm really pretty happy with as it's one of my first project that I started with exactly 1 vertex as opposed to some other prim like a box or cylinder.
Here's the quick versions of how I did it...
- Selected a tire as a reference, in this case I just wanted a tread pattern to target, not shooting for an exact match as the end result.
- I created one strip of the tread pattern, placing quads around the treads I wanted.
- Once I had created one repeating section, I duplicated it, slid it over and rotated 180 and lined up where the treads would meet.
- Slapped on an array modifier, bound to a bezier circle and some tweaking to the offset to merge the first and last points correctly.
- This mesh is smoothed and edge clipped but no Sub-D
- For the rims I just drew a quick rim profile something like "-________-" then spun it 360 degrees from top view, set the spacing to a number divisible by at least (2 * num of spokes you want) For me this was 20. 5 rims means I can make a couple interior edge loops and extrude every other 2 faces nd it comes together nicely in the middle. A real quick an dirty way for a rim.
- Finish by removing doubles and recalc normals
- Finally, just some base material settings