Yeh i know the dangers of not having a decent set of tyres on the back but at the same time if you went to any other
garage they wouldnt say a thing because it would be upto the consumer if they would want to change the backs. I dont disagree with what they say at all but its a bit annoying when I have good tread on the rear and I changed all four for the sake of saving money (which by the way was a great deal) and sold the other two they took off the back.