That's the point I'm making really, I think tramlining is as much,if not more, tyre specific as it is related to wheel size. As stated I have never had an issue on 19" Michelins and that's the way I would go if I wanted to avoid the problem. About 14 years ago my 330C tramlined really badly on the Bridgestones it came with from new. A change to PS2s eliminated it almost completely.