@widow: knowbody knows how to change the tire shapes. The external view tires (the ones we really need to change) still use a 2-d sprite like in gp2, so we can't change them using careditor. Unfortunately, unlike in gp2, they don't use a regular jam file. Instead they use one of the rcr-a jams (I think it's called chwheel1.jam), and none of the current editors can open these files, since they have a different structure from the regular jam files. Marco Alderuccio tried to change them with a hex editor, he managed to make some progress, but nothing like what we really want. I figure that what we really need to edit is the exe file, since the fronts and rears have different widths, but use the same jam file, so there has to be something adjusting the graphics to make the rears wider. So no, there is really no way we're going to change the tire shapes in gp3. That's why I stopped making any carsets older than 1993 (I'm making that season right now).
-Loren