Does this look like a crack......

Or a Harry Potter-esque scratch.
Right at the bottom of the seat tube where it joins the BB. Bit of a strange shape for a scratch though
There's a definite click if I run my fingernail over it :?
Cannondale Synapse 2013 aluminium frame
Right at the bottom of the seat tube where it joins the BB. Bit of a strange shape for a scratch though
There's a definite click if I run my fingernail over it :?
Cannondale Synapse 2013 aluminium frame

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And the frame material is?
Parktools :?:SheldonBrown
Here's a cleaned and cropped close up. There's a definite scuff between the two horizontal lines, but they are the ones I'm concerned about
Parktools :?:SheldonBrown
Good use of Python gif BTW
That's a crack.
A crack on metal is usually kinda hairline and thunder-strike ish. Travelling down the welds or along the contact between weld and post in that case.
Funnily enough, I landed in some brambles on the left side, you don't happen to have half a dozen Springer pups do you (the reason I fell off)
If the bike was new, I would reject it because it should have been picked out by Quality Control and rejected or at least sent to be one of the models that has a painted finish (yes - gulp!!). Only the best carbon lay ups make it out for a naked carbon bike. This one isn't.
Cosmetic carbon outer layers like this are very difficult to get perfect and provided you can't feel anything and can't open a crack up by pulling the axle points apart, it should be OK.
What bike is it?
Boardman FS Pro
I was contemplating putting generic bike retailer... wish I had.
Is the frame creaking or is there anything to suspect it is a crack? Remove the wheel and flex the stays - a crack will move. Looks like poor finishing of the topweave - this is a cosmetic layer, not structural.
Baby steps.