There has been a lot of questions regarding Hummer Rims lately. So here is link to my photos of the 12 Bolt Hummer Rims and 42 that I am running. Hummer Setup The Hummer rim is available in both an 8 bolt(bias tire) and 12 bolt(radial tire) style. Both the 8 & 12 bolt style are 8.25" x 16.5" They both have approx. 7" backspacing and 8 on 6.5" bolt pattern. That is the only similarity between the two. The 8 bolt has a .155" thick outer ring, has a Max PSI of 30, and a Max Load of 2850 pounds. The 8 lug also has "For Military Use Only". The 12 bolt has a .250" outer ring which is also the mounting flange, a Max PSI of 50, and Max Load of 3850 pounds. It does not have the "For Military Use Only", but does have a "DOT-T" stamped in it. I am running a hummer rim setup on my GM Dually D60 front axle, with a GM 14 BFF Truck axle that has 2.5" spacers in the rear. The Dually D60 WMS to WMS is 76-5/8" and the 14 BFF axle with the 2.5" spacer WMS to WMS is 72-1/4". I am building a Van 14 BFF to put in place of the truck one. With the 2.5" spacers on the Van 14 BFF, the WMS to WMS will be 75-1/4".