I have just had exactly the same
problem.
The tyre looks brand new until you turn the wheel out and the inside edge is totally bald.
I went and had the tracking sorted and he did say it was well out.
Problem is the car is still slightly veering to the left.
I took the car back and had the tracking chaecked and he said it was spot on.
Could this be because i haven't changed the bald tyre yet or is it possibly the lower balljoints as someone has just suggested??????