Hi there New member of the forum. A6 Avant Quattro - 2018 (C7) I was looking for a view on the following. At a recent tyre fitting I noticed that there was a different size on the front compared to the rear. I have looked back through all paperwork and cannot see a different size referenced on invoices. It has always been the rear sizing. No idea when someone changed them The fitters didn’t know and are simply replacing what was there. One felt that different sizes on Audis is common So currently on the fronts I have 225/45R18/95Y On the rear 245/45zR18/100w My view is that they should match on a Quattro and that the fronts should be replaced. Any views welcome and if anyone knows whether it is currently unsafe? Thanks so much Rich