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I'm keeping my eyes open for a comedy...dinner plate
If you were using ⅛" chain, you might be interested in the 65T TA Cyclotouriste that's sitting in my parts bin.
For serious comedic effect, while not a strict geometric solution, any arbitrary curve of constant width should function as a ghost ring since some degree of backlash is necessary at some points in the rotation of any non-unity ratio chain drive in order to accommodate chordal action
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gbj_tester
Yup!
Though I'm my case there's an EBB which simply doesn't provide enough adjustment when used alone. But I love the floating ring so much I'll keep it even when chain stretch allows me the remove a link and adjust only with the EBB (it's probably at that point already).
It's a 53t Dura Ace 7400 ring but I'm keeping my eyes open for a comedy 55-60t ring to use instead, just as a willy-waving exercise. I can adjust the EBB to use any large ring. Anyone selling a dinner plate please do holla!