Pic in small/small?
Here you go. I was wrong about it being 112 links, i've actually got 110 links as per Campy's instructions.
2 Attachments
Maybe the upper jockey wheels is too close to the smallest sprocket as the "lower branch"of the chain looks almost as if it is running flat?
I followed link below when setting up my 12 speed but skip to 5:45 for the bit I'm referring to.
https://youtu.be/MDYfrsaZgiQ?si=T8PzqpiS7-vVjpJE&t=341
Chain length looks fine. Have a play with the 'h' screw (b-screw) as it's not chain length causing the issue. Also check your freehub is not sticking.
@miloas started
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Pic in small/small?