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Won't help. Metal weighs more that rubber doesn't it? You're making a 14" diameter by 6" wide steel or aluminum metal band now 16" in diameter, and possibly 7" wide. Some quick math tells you this is heavier. You want weight near the center of rotation, not on the outskirts.
Plus you don't mention what size the tire is. 265/70R16? 195/65R14?
I can pretty much tell you it's a bad idea, don't do it. Do some searching for the ALL reasons why bigger rims and bigger tires are bad.
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