Hello,
First of all, I would like to apologize for my poor English. I am from Poland. I have an S3 license and I use the Vehicle Editor add-on. I would like to be able to change the type of tires in cars. For example, to install slick tires on XFG. Is it possible?
Thanks, Dawid.

yes, you just put slick tires from LFSEDITOR and export, you can adjust engine, mass and lot of stuff

First you need to allow slick tyres on the car. This can be done in the vehicle editor Allow tab.

Quote from Flame CZE :

First you need to allow slick tyres on the car. This can be done in the vehicle editor Allow tab.

Thanks a lot mate, this is exactly what I was looking for