Frame noise driving me nuts. Is from the hanger?

Equipment
1

Hi all,

I have a new bike that I build myself recently.

When I put it on the trainer it makes a noise difficult to describe.

I would say a resonating sound sounds like a very soft grinding.

It is not the trainer because I tried with another bike and another trainer and consistently the new frame makes this noise.

It is not the cassette because I tried also with the zwift cog.

The noise is very evident when in low cadence with smaller cogs.

I excluded also the crank because I switched with another and got the same noise.

So I focused on the rear derailleur.

I disassembled it and the only thing out of the ordinary that I noticed is that the connection between the derailleur and the hanger has a little play.

The play is very little. A fraction of a mm maybe.

The frame came with a direct mount hanger. So the derailleur connects directly to the hanger without the B-axle plate in between.

I have no way to try immediately because the only way is to try with the standard hanger but this means I need to install a new longer chain.

Is it possible that this is generating this sound?

This is really driving me insane…

Thank you

G.

2

Can you get a video of the sound?

My solution: Turn a fan on.

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3

Is the chain correctly routed thru the pulleys on the inside of the little tabs?

4

I can try to make a video.

About the fan…the noise is noticeable (even if less) when the bike is not on the trainer. So there must be something wrong and being a new bike this is driving me crazy :slight_smile:

5

Yes.

6

Jokes about the fan. I do usually just turn the music up when I hear a noise i dont want to deal with… a lot of them sort themselves out.

My areas to check:

  1. Clearance of front mech against chain
  2. Tape/gunk in pully wheel bearing/axle area
  3. Chain quick link properly installed
  4. Brake hose doesn’t have any play. This could sound like a slight rubbing or banging if hoses are rattling in their exit/entry points on the frame
  5. RD hanger is torqued properly… they’re all different and can have a million fit issues
  6. Check torque on pedals, check torque on cleats, and check torque on seatpost clamp
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8

3, 4 , 5 and 6 might be good candidates for me.

1 and 2 I have checked.

Thank you! Very helpful

9

One other thing to check is to put a bit of grease on the thru axle (assuming it’s not quick release). I had a creak on my mountain bike caused by this.

10

Internal cable rubbing/banging on the inside of the frame?

Honestly, I think the most noises I’ve tracked down have come from the seatpost or saddle clamps.

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