eBay and Craigslist finds

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Fatbiker in reply to @spotter

Reminds me of this.

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spotter in reply to @Fatbiker

very similar, what are those cranks? Early PM ones?

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PhilDAS in reply to @spotter

Looks like Rotor RCK

Before they started doing oval rings, they made these where the angle between the left and right crank arms change throughout the rotation to try and eliminate the dead spot

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