Hi,

I have no experience with Carbon fibre and do not understand anything about it so need someone to rest my mind.

I have just bought a second hand bike and the carbon fibre frame looks distorted at parts (I’ve attached two videos).

Does this mean the carbon fibre isn’t genuine or is this just a poorly made frame?

Could it cause any problems in the long term?

Cheers,
Lewis

To be fair it looks more like a messy joint rather than a pinch or crease in the material. In which case, it is more of a cosmetic concern. Would theoretically be slightly weaker due to misalignment, but as Fasta pointed out it is likely to just be in the outer layer.

I wouldn't worry about it too much, to me what you can see there doesn't look like any concern structurally speaking. The bigger concern is probably more a case of 'if this is what their cosmetic outer layer looks like, what did they do internally'. But, it's probably fine.