I write to beg your help and advice on the tyre noise and harshness problem with my otherwise perfect Mercedes C320 CDI estate. The tranquillity in this car is utterly ruined by this idiotic tyre fit, and I am anxious to change from the standard and mandatory 225/45R17 to a 16inch rim with a 55-profile tyre, either of 225, 215, or 205 width. MB is unhelpful on the subject, and insists that the standard fit is “essential, to handle all that torque”. The lie to this is that both the E class and the S class 320 CDI come as standard with the fatter tyres. Are you aware of any successful resolutions to this problem, and do you foresee problems with insurers?