USE AT YOUR OWN RISK

Update: This thread has been renamed (from "Hidden features in the game")

* Not wanting to mess with our (MRR) great liveries and respective talented artists. Just thought it might be interesting to somebody *

Original post: 

Has anyone heard of these hidden rims (wheels) as described in the video below?
Edit: Use at your own RISK

It seems you just rename the unused files with the names of the regular rims and you get to see the hidden wheels installed in your ride! 

I believe there are a few car out of use in the game files as well?

Anything else? 

PS. Little English corner - I call those parts "wheels" because they are formed by the rim / ring (the outer edge which holds the tires), and the disc (the set of pins or bolts which connect the rim to the inner part of the wheel, which then goes around the bearing, I guess haha).