Ianredspecial wrote:
...... Oddly my 2cv is one of the nicest tracking cars I've ever owned as far as going on a straight line is concerned.
The main reason for that could be the steering design. As with the DS & GS, the pivot point of each wheel is on the centre-line of the tread surface area. Almost every other car has the pivot point inboard from the centre-line, so any slight difference in the surface-friction of the two tyres, (such as pressure) will cause the one with greater friction to turn outwards, whereas even if you have a blowout on an A-series, (or G or D), it will continue in a straight line.