robk is right. Imagine being able to say that you finished #15 in points in the country in 17.5 TC (or World GT or what have you). I think that there ought to be three classes for TC (21.5, 17.5, open), three for 12th (same as TC) and this may get me shouted down but I think two for 10th pan (shout out to my boys in both the 10th pan car discussions). 17.5 LMP (235) and 13.5 WGT. (or the other way around whichever works). Rookies (once they've cut their teeth) can move up into whichever chassis they feel best prepared for.