[rick3000]

I go through two rears for every front, probably about 15-20k miles on each set of rears. I would advocate buying and storing the extra rears. Twice now I have had to replace all four because for some reason the 255 rear size is always getting discontinued. Since it is your DD, you might be able to get a few extra thousand miles if you go with a less performance oriented tire like High Performance or Performance instead of Ultra High or Max Performance.