Wow! I have a new appreciation for my Watanabes after watching this. Thanks for sharing the link, Chris!
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Just speculating here, but maybe SSR filled a niche for multi-piece wheels that Watanabe-san wasn't willing to commit to. He wouldn't have to change his process much at all to kick out cookie cutter sand cast wheel centers for SSR, and SSR could just focus on making the barrels for a range of offsets for each size, and put them together. Seems like the multipiece SSR RS8s would be cheaper to produce, but maybe the had an agreement not to undercut Watanabe. Also, seems like 3-piece wheels have always commanded a premium so likely they were more profitable. Seems like it ended up being a win-win for both parties in the end. Maybe Larry can find out the true story?