Albatross bars are cool!!
Join Date: Mar 2010
Bikes: Raleigh Alyeska; mystery Nashbar MTB tandem
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Good discussion here, as I've just been wondering exactly the same thing. More to the point, I like the idea of the dual-pattern BMX rings since they'd fit both my 110mm crank and my 130mm. My '85-vintage Sakae alloy rings from a half-step touring triple have no ramps or pins at all, and they shift great in their original configuration, so it makes sense that a singlespeed ring should work fine also so long as the chain fits and the derailer can be made happy with the ring size.
Interesting about the Biopace big ring with round middle ring; Sheldon Brown observed that such a combination made no sense, though based on his comments about Biopace being more comfortable at lower RPM, I'd think it would work extremely well.
Oddly, of the rings I've been experimenting with lately, my 39t from a Sora double (no ramps) works beautifully in the middle position on a triple, while my 36t Accushift middle ring prefers to suck and chatter.