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I had this issue with my CAAD12. I use to have to tighten it all the time. However after removing the spacers above my stem, so the top cap sits directly on the stem it has been solid! Cannondale say you should not have any spacers between the top cap and stem, not really sure of the physics behind it, but willing to accept!
wjrh-
Mine is also setup like this, top cap setup straight onto the stem
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This has also defied the laws of physics / logic to me, as to do this you’re basically going to be very partially clamping the stem above the top of the steerer tube. Fine with a thick alu steerer, but with carbon?! No thanks!
The mantra of always having (at least) 5mm spacer above and below the steerer has repeatedly been a case for bike companies (I have no personal experience with Cannondale) rejecting warranty claims for cracked / damaged steerer tubes.
mcmyk
Dick
The headset expander bung on my 2018 CAAD12 loosens after every single ride. What can I replace it with that will actually work? What about the Deda bung for carbon steerers? Ive used it before and it’s been great.