Remember that a 10" rim does not really make the contact area of the tire wider, just wider at the bead. Your tire will stay on better with a 8" rim than with a 10" rim especially if you ever run 8 - 10 lbs of air. I never asked or worried about back spacing when I got my Mickey Thompson rims 3 years ago. Slapped them on, an inch wider than before, and never have popped a bead. I've pinched them down to the rim before running John Bull, Hairy Crack, Bullfrog, Heartbreak Ridge, Awesome Canyon.....Match the front width and run it.
Mitch
Mitch
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