Materials of the author «Иван Кузнецов» 1

Brings the behavior of dirt in the game closer to reality.

Now, if you fly into the mud at full speed, respectively, mud splashes heavily stain the car, when slipping and driving through mud on high gear as well, but to a lesser extent, well, etc., depending on the selected speed mode.
The mud splashes themselves and their physics have been made more realistic, ridiculous lumps on wheels have been removed (thanks to Soul Reaver for that) and dry small hard lumps flying out from under the wheels, only slush has been left, its intensity has been increased at gears 1+ and higher.
Pollution on cars now has volume, which also adds realism.

I recommend using it with the following additions, it will greatly darken the visual effects of the new dirt:
SweetFX graphics improvement
Always the sun+Fog Reduction+Blue sky
Removing graphics noise

To work in multiplayer:
Do not install SweetFX. Use SpinTiresMod.exe with the original files in the game disabled.
PS. Many thanks for the help to Alexander Oboskalov.

Installation:
In case you don't like it, the archives of the game Media, MeshCache, TextureCache copy and save in a separate folder.
Copy files from the downloaded archive to the game archives, agreeing to a replacement.
In any unclear situation, we clean the cache.

Have a nice ride!