This might just be me being a bit paranoid, but since i've put 18" wheels on my S3 the steering has seemed a bit light when going straight (especially at motorway speed) I've got the tyre pressures all set at 36psi (which i think is the recommended pressure for 225/40 18's) There isn't any vibration from the wheels, so I'm guessing that they're balanced OK. Thought it might be the tracking, but it isn't pulling to either side and from what I remember the wear on the old tyres was fairly even. I would have expected the steering to get slightly heavier with the bigger wheels. Thought about putting the old ones back on to see if it still feels the same but haven't had the time (or the energy!) Any suggestions?