We like Shimano Biopace non-round chainrings, and they are reliably available on eBay. We have expanded our article on how to choose and use them.
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The article still has one omission – there was a 40T 130BCD ring. Only available in steel and now about as rare as a Uniglide threaded sprocket.
I’m running that with a 53T at the front on my commuter/tourer- makes sense with the wide range of rear gears available these days
Thanks. I’ve edited the article to reflect your comment.