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@ewanmac
interesting... I can't remember where I read it but I thought that the less ovalised shape of the Arc chainrings was supposed to mean that they were fixed friendly.
I'm just weighing up whether to buy an arc chainring or stick to fibrelyte for my geared TT bike... £135 seems like a lot for a wobbly chainring that I'm not certain I'll like but then it's not a whole lot more than a new fibrelyte so I may take a punt.