Thanks Jochen and Clay
I have already checked what's about the disc of the brake.
I have already checked the bad topology but at the moment it's too difficult with my knowledge to repair.
Smoothinng unfortunately doesn't solve the problem.
In Wings3D it looks like this:
[attach=1]
My procedure with smoothing other objects worked good like this:
first I check that all parts are combined to get one single part
then autosmooth (seems to make sure that all parts are calculated together in relative correct direction)
then smooth
usually I get a better and smoothed object with more polygons.
But here I get a strange object like this:
[attach=2]
rendering without reflections the not modified object seems to have no problems but connecting reflection shaders I get things like these triangle areas as you see.
But when I checked meshes of high priced top quality bikes on turbosquid (100$ and more) they all seemed to be constructed with similar techniques to get the holes in the disc...
The tyre...
I could identify the tyre parts of the object:
[attach=3]
But I have no idea how to deform a special area.
Also working with single faces didn't give me a solution.
I still hope people will not look too detailed and strict on the animation ... I have still more than 23000 images in more than 20-30 scenes/shots to work on... just too much to finish until 2020
[attach=4]