Actually, it can be quite easy. it depends on what you want to change, if you only want the tire physics, so the way they act, you have to replace the tbc files. I am not gonna explain how, else i would be helping you leeching. If you want to have the tire models, it is a bit more work. You'll have to fiddle with GMT,DDS files within the MAS files, and probably with the parameters that tell rFactor where to place the tires. Also, you'll have to change the gen file.
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