Originally Posted by Doug5150

When I posted a link to that page on a newsgroup, several people noted the same thing that I saw when I was making it--the smaller non-round chainrings in ALL the earlier brands (BioPace, SR Ovaltech and Sugino Cycloids) seem to have "more radical" shapes. The 52T BioPace for instance looks rather like a circle with four less-curved areas, it looks "almost round", but the 30T looks like a diamond with rounded corners--it doesn't look round at all. Nobody who commented had any explanation for this.
~