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It's really hot or miss. Not all OEM wheels are super strong or weak. Same for "brand name" aftermarket. You pretty much have to research and see which brand/model tends to be better/worse. For instance, style 296 on the Z4s have been terrible and there's a class action settlement against BMW because of them. At the same time, style 513M and 437M are forged and known to be light and strong. Generally speaking, cast wheels tend to be heavy and weak, forged light and strong, and flow forged(there's other descriptions of the same process) lie somewhere in between.
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