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STEP 1.
Firstly, change your bottom viewport to "Right" "Shaded" so we can see the area where the tread will go. If Sub Divisions are on, turn them off by pressing Tab. Copy the polygon in the center right above the X axis onto another layer. This is what we will build our tread on. Delete the polygons where the tread is going to go.
STEP 2.
Replace the background image with our tire tread background and make the width the same size as the polgon we copied off the tire.
Then create a third layer, place the laywer with the single polygon in the background to take advantage of the snaping to background (you dont want to under, or overflow the polygon--turn snap to geometry on). Use the pen tool to trace out the tire tread. Since the -Y and +Y parts have to join together seamlessly, select each set of points that need to be joined and use the stretch tool on them, Set Factor Z to 0%.
If the tread is duplicated alot, like our polyglass tire, we just simply cut and paste the pieces. After we have cut and pasted all the pieces, we copy the points from layer 2 and reconstruct the tire wall as seen below. We want to keep things as quadralateral as possible, even if we are using n-gon subdivision.
STEP 3.
Select the polgons you want to extrude and use the bevel tool on them. If you didn't keep quads, you will have difficulty. Make any additional edits to the tread. Delete polygons on the side that are left over from the bevel which shouldn't be there. Press tab for subdivision and verify everything looks okay.
STEP 4.
Once your ready to go, radial array:
Count: 30
Merge Vertices: yes
Action Center Auto 3D: X, Y and Z = 0
Action Axis Auto: Z
Use the merge points tool (0.06" is fine), as the extruded points do not join with the radial array. This leaves a lot of junk. You should Unify polgons: Polygons -> Reduce -> Unify.
You delete all two point polgons show in the statistics view port.
STEP 5.
Press M, change the tire tread material to "TireRubber." Paste the tire tread in to layer 1--points merge automatic.
STEP 6.
The sides of the tire look way too flat, so select a few polygons on the side and do a Loop Slice at 50%. Press T and move the new loop and create a buldge.
Now we have the basic model of the tire and wheel. I leave it up to you to continue to detail it. I've made several detail changes to the model. Here are a few:
1. Removed the top of the nozzle, used stretch to make it more circular, and used extender to create a cap on the top of the nozzle.
2. bolts are six sided, not four, so I used Loop Slice to cut each bolt down the middle, and adjusted the edges and weights to give six sides instead of four.
3. I adjusted the size of the black cap, where the SS is so that it looked like reference materials.
