What have you done to your bike today?

I think I whacked the derailleur hanger. Hopefully I'll get to check it out this weekend after I'm done with the "honey do" list.
 
Yeah, i torque everything especially carbon. I didn’t assemble this though.

On a closer look it appears it’s a mark from the stem. There’s a rough edge on the inside where it mates to the fork steerer, I can flake the raised aluminum off with my fingernail. It matches up perfectly with the scratch as it’s on the same angle.

Dress the [edge of the?] stem clamp slot with a piece of emery cloth or a key file.

Pretty normal for...pretty much everything that isn't explicitly stated for use for CF composite to have burrs, etc.
 
Which brand was it?
The blue tubo-lite
There was no sealant in the rear front was ok
20240411_072859.jpg
 
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