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Cast vs. forge
Most OEM BMW wheels are cast. Many aftermarket wheels are forged, sometimes centers as well as hoops are both forged, which makes a really nice wheel. Forging produces drastically superior strength, defect and fatigue performance. Forged parts are as much as 60% stronger than cast parts! This combined with good design can really lower the weight of a wheel. Of course bad design which focuses only on looks will usually yield a heavier product even with forged parts.
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