Chain rumble

[jeffrey]

Just built my first bike and I have the chain rumbling like this (please ignore the crazy freehub noise popping up here and there)

https://youtube.com/shorts/Ib4CJ3dFoyc

Derailleur seems to be set propely, moves up and down all the range with no problem and the chain isn't touching the adjacent cogs.
Front derailleur should be fine too, this happens mostly on the bigger chainring in both trim positions.

What could it be?

A bent cage?
Twisted hanger?
Cassette working badly with the chain?

Parts are:
Groupset Shimano 105 R7000
Chain Decathlon (KMC) X11
Cassette Goldix SL cnc

[ChuckyRagnar55]

Hi everyone, there might be a thread for this, but I can't find it. I need help with a 12-speed road bike chain. I've installed a Goldix 11-34 steel cassette and 55-40 Stone chainrings. The groupset is Wheeltop EDS EX 6800. According to artificial intelligence, the smartest option is a KMC X12, but I've read that they don't last very long, and I wouldn't want to break the chain and damage my teeth. Any advice or experience? I've used a KMC 11-speed without problems, but now I'm not so sure.

[Dan S.]

Monobloc cassettes do tend to be noisier.

[FullCarbonAlchemist]

Be careful about where you get KMC chains from. There are a shocking amount of fakes out there and they run/shift like absolute shit. I got a couple a few years ago and had to throw them out. DRASTIC difference between them and legit chains.

Combine that with a Goldie cassette that also has questionable tolerances and it’s not surprising you’re getting this behavior.

Personally, my experiences with both cassettes and chains have taught me to avoid saving money on these particular parts. I’ve had way too many issues with fake chains and cheap cassettes, not worth it IMO.