I have seen it accidentally. When i understand it right, it provides the tires that use the latest technology and are available for the public. https://docs.studio-397.com/developers-guide/cars/car-physics/tyre-database @Michael Borda there is a small issue. the link 'M_30-65-18x12.5_P2M_Rain_2017.tgm' downloads the tgm file M_30-65-18x12.5_S9M_Slick_2018.tgm
Thanks for mentioning it here. Wouldn't have noticed it. Maybe Michael should also mention it here https://forum.studio-397.com/index.php?threads/developers-guide-released.59088/
Because it is still not fixed, i have asked a friend that has some web programming skills for help and he modified the link. Here is the working link M_30-65-18x12.5_P2M_Rain_2017.tgm