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@johnQdarwin
its carbon. id love to know excatly whats under the paint myself. it looks like alloy headset and bb. spent ages flicking and lightly tapping with a small spanner on the tubes trying to work out whats carbon and whats alloy by listening to the different sounds. theres only one place where you can see where ally ends and carbon (or more alloy??) starts.
about two inches from the bb shell ,on both tubes you can see a black line that goes around the whole tube .
worried ? yes i am. are these new. or been there after the things first couple of years of life. are they just pressure cracks in the paint where the frame has been bonded together ? or what ?
mr hoops ? anyone?