driving out from work this evening, and heard a noise on the left hand side, got out for a look and discovered this on a flat back left wheel!

I've already replaced the front 2 Federals 'cos they got out of shape and I had a lot of vibration in the wheel - thought it was wheel balancing first but when the tyre place took a look they found the tyre was actually gone out of shape. They showed it to me... never heard of a tyre doing that before.
Now today I discover this crack in the tyre wall. Well, they were cheap for a reason!!
