Modders have always had to deal with missing data that they've needed to use rules of thumb or common sense to fill in. Building tires for the new system is just another. Same as it was, same as will be. You either use it as an excuse to stop, or you work your way through it. For me kicking your feet and crying about it shows that you have a "can't mindset". This is what is actually stopping people, not a new tire model or lack of data.