Let's start on the tire tread now. There are millions of tire patterns out there but you should be able to get an idea of good tire treads from your reference images. I prefer to model my tire treads instead of using a bump map because it looks better and you can do closeups of the tire.So let's start with a plane in the top viewport with 2 length segs and 13 width segs. Convert it to a poly and then select the 10 shown vertices.
Drag the selected vertices to the right as shown.
Select the vertices shown in the top half of the picture and move them to the left a little to make it look like the bottom part of the picture.
Make the cuts shown in green. You can use the "QuickSlice" tool or if you know how to use the "Slice Plane" tool you can use that too.
Make 3 extrusions on each side as shown in the picture.
Now select the polys shown and extrude them upwards.
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The extruded tread pattern should look like the picture. Delete the red polys on both sides of the tread.
