The truck has such vast amount of empty space around the rear tires that these things look tiny. We will need to sell this wheel tire combo and go BIGGER. i will eat the cost difference as it is my fault that i stayed conservative with the tire size. I had never built a truck before so the 2D measurements don't really equate to the (3D)spacial enormity of what is actually there. These are 13.5 x 31 Hoosier Quick Time Pro on 12" wheels with 5.5 backspace 4.5 bolt pattern. Likely to go 15x14 with 4.5 backspace and 16.5 x31 tire. i will need to get good measurments now that the bed is on and its under its own power again