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Every cast wheel I've come across, whether OEM or aftermarket, will have features on the back side that are obviously cast. Machining is typically limited to a few critical surfaces. See the first photo. The gray TRD wheels have no cast features at all. The entire hub, including the relief pockets, is machined. The only markings are engraved on the barrel. That leads me to believe they are forged and not cast. Most likely they are billet forged and not die forged.
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