I'm getting some RS6s for my TDI sport. What is the recommended offset. I went to get them fitted this morning and the bloke had got 30? offset (don't know 30 what?). Made my beatiful car look a bit like a tractor my wife informed me. Spoke to the bloke and said that it was really not right with wheels pretruding out of the front arches!! He agreed, took them off and said he'd get me some 45? offset. Is this right??