Don't give up because of that. I didn't known how to model rims and I started to learn two weeks ago.
I use Blender and found no tutorial to read about rim making. So I learned by myself ...
First try:
It was a recon to find my modeling style procedure but was a dead end because I made a early mistake and Blender is not parametric so I could not undo..
Second try:
I restarted the rim from scratch and finally found the end. The experimental rim looks what I wanted. The 2nd try is already a success.
First application:
Now my current WIP. My third ever rim done very quickly. So don't give up for so little problem