Hi,
The following is a CAD tire model I rendered using KeyShot.
This is all modeled?
Yes, except the Side text.
Very impressive, although this seems like something that could be done entirely in Substance Designer. It's interesting that you chose to model it.
I work with wheels and modeling them and you wouldn't believe how hard it is to find a good model of a 20" and bigger tire. I would love to use this model.