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@bertocq
Please correct me if wrong, but can't find a thread about them in the forum, apart from this 7 years old.
I've been reading about them since I first got the chance to use a CX with Rotor Q Rings for two months years ago... But I'll finally try them in my last project
Yes, I know there is lots of articles and studies claiming that they let you deliver more power, and others that they really don't. Not here to start another holy-war / flame... just to talk about different models for those interested in trying them out.
As far as I know in the market you can find:
Here's a nice article comparing Osymetrics vs Doval vs QRings (in Spanish, but google translates it well from the guy that did #2 on this year Trans American Race equipped with Doval. He's going to re-sell them (they are only sold via ebay and shipping takes more than a month).
Since the Doval ones are now the cheapest, and the design seems quite interesting, I'll give them a try and report if anyone wants to know how they perform with the chaindrops (yes they are ugly like the others, not looking for a salon bike here, just to avoid strains and pains on endurance rides)