I have 18x9's on my truck right now with 275/65R18's (32" tall). I only have a 2" shackle in the back right now but they give it a lowered look without loosing ground clearance. I'm thinking about doing a 2/4 myself but I'm not sure of what size tire to go with. If you want a stock size tire I'd do either 275/55 or 255/60. pretty close to stock either way. I think I'm gonna do 275/55r18 when I change these tires. My sig is without the shackles but you get the idea.