Your bike looks like it's coming along nicely!! I just bought a used cannondale system six frame as well and I can't tell if I have corrosion or not. In my case I see some bubbles near the water bottle bosses (this is in the carbon portion and not in the carbon aluminium junction so I doubt it's corrosion?).
Is that something to be worried about do you think?
Thanks!
A new secondhand Cannondale frame (did it again)
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