i do not know the cars (mod.) which jayblue do make this season, big download this is.
but often in showroom the tyres are not correct.
to see which tyres the car have, you have to look in Gamedata/Team/then undername?? perhaps prototype or whatever?/then name of car, perhaps Audi (example only, i do not know mod.)
then open this folder with carname.
here is a file called .hdc
scroll slow down and then you see
TYREBRAND: ..........here you can read the name of tyre.
here many other things are too for watch, test it.
if only 1 .hdc file in a carnamefolder? then the cars should be equal in tyres, engine, aerodynamic things.
more .hdc files and .eng and .tyr files, then you have to read more and it is not so easy, but my english is way to limited to explain and my knowledge in this things too
i am a driver, not a programmer or physic change man.