Tires: new rims

Question
I just ordered a 3in. Lift kit and wheel spacers...I plan on getting 31/10.5/15 tires. I want to get new rims. I need to know the dimentions of 15in rim that will work with the tires as it will be an aftermarket rim. Like 15 by 8 or 15 by 10.  Also lug nut specs .

Answer
Rob,

The manufacturers of tires publish dimensions AND the allowable rim widths.  For a 31X10.50R15LT, the allowable rim width is 7" to 9".

Lug Nuts?  Those are tied to the studs - which vary.  Here's a guide published by a specific manufacturer of lug nuts and related parts:

http://www.gorilla-auto.com/pdf/GAG10.pdf