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@Rik_Van_Looy
Certainly is - it's a 400LX MTB ring 48T
I stuck it on to see if it works or whether there'd be a pulsing chain tension.
It worked - I can only assume that although the radius changes there's a constant amount of chain in contact with ring throughout the "circumference".
I changed it beacuse I find them annoying as they don't promote smooth pedalling which is one of the good reasons to ride fixed