This is pretty simple and easy tutorial for all of you who
have troubles creating tire rims.
Create a "Tube Object" with 30 sides. Right click on it and convert it
to Editable Poly.
Select one inner edge and then click on "Ring" button. This will
select all inner edges. Now connect them with value 4.
Select the middle row of polygons
Scale them inwards.
Extrude them (local normal).
Move inside vertices as the picture show (use top view).
Select the following polygons.
Extrude them inwards (as a group).
Delete the polygons you just extruded.
Fill the hole with create polygon tool (on both sides).
Now use cut polygon tools to cut the middle polygon to find the center point.
Select the vertices as shown on the picture and use weld command.
Delete the polygons as shown on the picture.
Select the following edges and connect them with value 3.
Move the vertices as shown on the picture.
Remove selected edges on the picture (both sides).
Connect the edges with value 1.
Enable Edge constraint and move (using scale) the vertices up.
Delete polygons shown on the picture.
Create polygon.
Next 3 steps are needed if you wish
to create high-poly version of the rim!
Select the edges shown on the picture (from side view).
Chamfer them.
Weld selected vertices together.
This is what we have now.
Select the object in the side view and go to Tools -> Array.
Array Options: set count to 5 and roatation value 72 on Z axis (360/5 = 72
degrees). For "Type of object" select "Copy".
You will get the following.
Now select one part and attach all the others so you will get one object.
All we need to do now is weld the vertices as shown on the picture. Select all
vertices (CTRL+A), click on weld and select value lower then your chamfer value.
For high-poly version just apply Meshsmooth modifier on top and you are done.
