I was told by Highlifter that you could run 27" tires without a lift. And then I was told by Jagged x that 27" tires would rub on some of the plastic, so I should stick with 26". It probably depends on the tire also, since they are not all the same size per rating. Highlifter is supposed to have a 2" lift out within a week or two, and then you can get alot bigger tire under it(29.5")?