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I did suspect my Ultegra Di2 shifters but I don't think it's from there, still does it hands on hoods....hard to tell where exactly it is coming from really....even suspected the junction box itself...spent my last 2 rides holding things with one hand which not that easy because it appears at high speed on slightly rough tarmac where you need your 2 hands on the bar...
Aldersbrook
Does it go away with your hands on the hoods? I would put money on it being the lever ports, the plastic block can, and does, rattle in its little space. I stuck a bit of rubber behind it and it’s mostly stopped the noise