Went in to the tire store today with a slow leaking tire. Turns out to be a cracked rim. I bought a used set of oe rims a while back so I have some spares, but with 3 rims with cracks I dont think what I have is going to last much longer. So I have done alot of looking this evening and while there are a lot of wheels out there I find very few that have the same off set and backspace as the OE. From my research and doing some measuring of the OE rims it would appear I need a 43mm off set and 6.2" back space. Not sure why you need the 2 measurements. It would seem to me the they are 2 different ways to measure the same thing. Almost everything I saw had a 0mm off set. Not sure I want the wheels sticking out another 1 3/4" from where they are now. 

 

I guess what I need to know is if I am reading these measurements right? I did not have this trouble with my trailer wheels, they were marked and I had plenty of choices. What are some of you all running?

I'm not saying all tires are this way and 17's kind of fall in a grey area, but on the thousands of tires I've mounted the vast majority have been this way. 

Well here is what i just found on the subject. At least for the AT3's.https://tiresize.com/tires/Cooper/Discoverer-AT3.htm  I also found this on the ATP's, not nearly as informative. Actually very lacking of info.https://tiresize.com/tires/Cooper/Discoverer-ATP.htm