Ram 3500 SRW wheel replacment

[DustanT]

So I replaced my 2011 ram 1500 with a very nice 2004 Ram 3500 single rear wheel a few weeks ago. The truck is stock and the wheels are the steel clad junk. I'm looking at replacing them with new steel and trying to figure out the offset I need to get them out to the factory flares. Currently sitting on 265/70R17 and would like to fit 285's. I measured the tire bulge to the flare and it was 2.5 inches. I think the OEM offset is +43. What do you guys run on your HD rams?

Thanks!

 

[HemiLonestar]

No factory installed fender flares other than dually during the 3rd gen run, those are aftermarket. Correct on the wheel offset.
By the way....what is a "cummings"?

 

[DustanT]

Think I have it figured out, correct me if I'm wrong. Stock is 265/70R17 with +43 offset. Adding 285/70R17 and a -12 will push the tire out 2.6 inches. That would make the tire bulge flush with my flares. So the offset and extra tire width is 2.6 inches or 55mm. I hope this offset won't affect the towing/hauling abilities.