I just picked up a 91 Pathfinder 4x4
V6, auto, stock suspension

It has the 15x6 stock chrome wheels. I want to put cragar black 15x8 with 31x10.50 R15. What is the best offset / backspacing for 15x8 wheels with 31's?

Also, where is the best place to order wheel/tire combo's that are mounted and balanced online? Or am I better off ordering separate and having them mounted locally?

thanks!

I can't help with sizing, but ]www.thetirerack.com is a good place to check fitment and buy wheels with tires mounted and balanced.