I'm having trouble with what seems like a wheel out of balance but disappears after a short drive on the motorway. It's been into Audi and they have said its a tyre out of shape.
I'm picking up some wheels tomorrow that I will be using for winter tyres this winter, they are 17's but I want to know if I would be ok to stick 2 17's on the rear with the original 18's on the front to see if the vibration disappears altogether the difference isn't that much see table bellow. But I'm not sure if it will cause the quattrro and problems?
Before anybody suggests to put all 4 17's on I cant as 2 tyres are scrap