I was wondering what the max tire size guys are running with a 4" lift with no fender trimming. I am working with Thomas Cepek on building a set of rims for dually pickups that would allow you to run a heavy duty super single tire. I feel that this would allow people to get more use out of their duallys without modifying the truck unless you wanted to. If I can make this work I am planning on taking the duals and fender extension completly off.
As a starting point we are using his super strong H1 Hummer rims which are rated at 4200 lbs loads. These aluminum rims have been tested and DOT certifed for use on the very heavy H1. The H1 rims use a very deep 7" offset which is very close to putting the rim centerline back where it needs to be on our dually spaced trucks. Rim centerline is moved outward 2" but the inside wheel bead lip is within 1" of the current duallys location. This keeps the tire envelope from moving to far in and rubbing on suspension parts.
The options for sizes would be a 17"x8.5 or 18" by 8.5" or 9.5" both have the same backspacing. We may have to use two different rim offsets to align the wheels front to back but I won't know if this is the case until I do some more layout work.
Thomas has stated that machining the wheels for the 5/8" lug stud would not be an issue. These wheels are lug centric and would require 5/8" acorn nuts.
Some info about H1 rims can be found here...
http://flashoffroad.com/features/Wheels/Wheels.htm
Some info about Cepek rims can be found here...
http://flashoffroad.com/catalog/origina ... Wheels.htm
Please provide me with any comments or interest. I have not brought up with him a possible group buy but it could lower our costs if there is interest.