3.5 to actually clear the brake caliper (stock 85), 3.75 is most common aftermarket and is what I have and I have to mount the wheel weights inside the rim or they get knocked off. You can custom order any backspacing from AR from what I have read off pirate. I would go 3 inches for a wider stance or maybe a 16 inch chevy rim. But why not get some 3.5 old stock rims and run the new 33x10.5 or soon to be out 35x10.5
Mike.
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85 Flat deck toyota, chevy's, new frame, for sale.