I would guess my rear wheels were about the same specs as you(h&r race sprigns, 2" drop). I did the 15 dollar camber mod and 3 months later my rear tires hardly showed wear. The front to the eye looked ok, so I didn't worry about it. In that same three months my front tires ended up bald on the inside. I would do something on both if I were you, unless you like buying tires.