I got 27" Swamplites on my 450ES. I had a 2" lift on when I put the tires on. No rubbing at all and I am about 275 pounds. Then I had to take the lift off of the front because of axle issues and it would rub a little, usually when turning hard at accelerated speeds. So yes, you can use them before you put your lift on, but I would recommend the lift first.