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If you have a stock wheel that is low pressure cast and weights 30lb, it will not be as strong as a wheel that is forged or rotary/flow from forged that weighs 30lbs.
Since the forging processes make the wheels stronger, most aftermarket companies reduce the weight of the wheels claiming them to be "just as strong or stronger" as OEM wheels. It allows the weight to be reduced to 22-25lbs.
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