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@myfavouritegreek
The carbon is definitely amplifying whatever is happening, but there is friction as the chain enters the sprocket. It sort of sits on the cog then drops in. I'm guessing this is causing the up and down 'wobble' as I turn the pedals hard. I'll have to swap out the chainring and see if it makes any difference. It is a Miche Xpress ring currently. On the plus side, the 1Z1 spring clip master link is very useful.