Originally Posted by tlp
There are random wear bars in B, C & D channels. If you are making contact with the wear bars then they are shot. By the looks of it you only have 2 or 3/32th tread remaining. Time for some new shoes.
Agreed - time for new tires. From the wear pattern it appears you've been running too much pressure in the rear tires. Also, if you are switching to PSS on the rear then you should replace the fronts with PSS as well.