What’s the reason for this squeak

[ebikeFan1234]

This is a stealth bomber clone. Recently it started to squeak as soon as it sit on it or apply any force. See the video. The sound seems to be coming from either the rear shock or the place where swingarm attaches to frame. Please help in diagnosing the cause

 

[Papa]

Silicone aerosol w/nozzle and spray each pivot (one at a time) while it's squeaking.

 

[ebikeFan1234]

I have sprayed WD40 oil in various places of the bike but no change in the squeak. What does this squeak likely indicate - eg any malfunction with rear shock, some loose bolts, rubbing of the frame with something?

 

[amberwolf]

Might have something to do with this continuing to fail? Breaking metal can squeak.

Enduro bike frame issue

This is my Enduro ebike purchased few months ago. In the rear shock area I am nothing paint has come off. Does this represent a crack/frame damage? Is the bike safe to ride?

endless-sphere.com

 

[ebikeFan1234]

Those are paint chips. Haven’t seen anything structural

 

[gromike]

It looks like a failed weld from what I see in the picture.

 

[slaphappygamer]

If you gently touch the area that you hear the squeak, you MAY be able to feel the squeak. I found my front wheel had a squeaky rubber grommet at the quick release skewer that way.

 

[offGridDownUnder]

Detach one (or both) ends of the shock and move the swing arm. Does it squeak? Where?

If not, exercise the shock mounts. Put a shaft through the mount points and load them. Do you feel movement?

 

[ebikeFan1234]

I played around with the compression setting. When it dial to hard (ie locked), the squeak is long sounding after the compression, as if the length of squeak is proportional to the time it takes to decompress. So I guess this is related to rear shock spring

 

[Papa]

 

[ebikeFan1234]

Any input why rear shock could be squeaking like that? I sprayed WD40 oil and didn’t make much difference

 

[gromike]

Maybe the upper shock mount has partially failed and there is enough metal left for the mount to hinge. In that case the squeak would be metal to metal contact in the broken part. Regardless, you need to clear that area to bare metal for a proper inspection.

 

[ebikeFan1234]

Pretty sure the sound is coming from rear shock around the piston

 

[Chalo]

Pretty sure the sound is coming from rear shock around the piston

Well, start there then. As for me, I would start where my bike doesn't have any silly articulation or telescoping in the frame, fork, or seatpost. Then it's easier to figure out where the noise is coming from

 

[dgc]

I agree with gromike, that looks like the weld is peeling from the bottom upwards, you may be able to see something if you remove the black side cover and look at the other side of the frame section where the shock mount is welded to the frame. It could be the shock but is it worth the risk not doing a close inspection, sometimes one gets bad welds where the penetration is poor.