I have kept the Biopace chainrings on my 1989 Schwinn Circuit, because like the Sante groupset on it, it's part of the bike's original equipment. I tried it in the original configuration, and I noticed a 'surge-y' feeling when going up a 2-3% grade. I currently have both rings rotated one spider arm clockwise, which makes the orientation more like the current thinking on oval chainrings, and I don't notice the same feeling, though of course this is totally subjective. But I'm leaving it like this.
I just picked up a 1985 Centurion Ironman that also has Biopace chainrings, so I'll experiment more when I'm finished with the rebuild.
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