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All Shimano cranks are bonded, so from recent experience of my 6800s separating like this
you'll hear the creak before they go if it is a crack. But, there's many more that haven't than have, so it might just be a manufacturing mark.
inspect them where the chainrings meet the crank arms - mine when there most visibly first
fredtc
@atk
Does anyone have a set of Shimano Dura Ace FC-7800 cranks they could take a quick look at?
Is this just a manufacturing mark or is it a crack developing? This isn't my photo, but I do have a set with a similar mark.
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