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Does anyone know what this is?

Old 12-21-19, 06:07 PM
  #1  
elgrande
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Does anyone know what this is?

This small rubber dustcap-esque thing fell from somewhere around my rear derailleur / rear hub area. I have no idea where it came from. It is about 5mm long and the head has a diameter of about 4mm. Any ideas?

drive.google.com/open?id=1Qd08XGek2wCh6zUn_ivEHRb84QtXb9cZ

Would be grateful if anyone has seen one before.

Ben
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Old 12-21-19, 06:10 PM
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Originally Posted by elgrande View Post
This small rubber dustcap-esque thing fell from somewhere around my rear derailleur / rear hub area. I have no idea where it came from. It is about 5mm long and the head has a diameter of about 4mm. Any ideas?

drive.google.com/open?id=1Qd08XGek2wCh6zUn_ivEHRb84QtXb9cZ

Would be grateful if anyone has seen one before.

Ben
Link does not work.
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Old 12-21-19, 06:22 PM
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elgrande
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Apologies; I am not allowed to post a photo until I have 10 posts. My browser automatically adds the https : // (with no spaces) which the full link requires.
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Old 12-21-19, 06:23 PM
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elgrande
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Maybe now I have enough posts...?

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Old 12-21-19, 06:23 PM
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Link fix:

https://drive.google.com/file/d/1Qd0...84QtXb9cZ/view

I'm not sure what that is. I don't recognize it as a derailleur part. Do you have a rear disc brake? Perhaps it's a rubber dust boot/cap for that?
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Old 12-21-19, 06:30 PM
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Photo is fine. Looks like a plug for a hole? Don't really know. If you tell us about your bike and drivetrain that will help, pictures of the bike will help more. Someone might know then.
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Old 12-21-19, 06:41 PM
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Thank you for offering to help. The bike is an Aluminium Trek Road bike. Drive train is bog standard Shimano Sora. Rear wheel is Mavic Aksium. The rack is a Tubus Logo, but I see nowhere on the rack that looks likely. The rubber plug fell when I undid the quick release and popped the wheel out of the frame (the bike was upside down and I lifted the wheel vertically).



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Old 12-21-19, 06:44 PM
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I think that's off the bottom of your coffee maker.
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Old 12-21-19, 07:30 PM
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That looks like a plug for a rack mounting hole. Look on the other side of the bike to see if there is one like it there someplace.
Edit: Did it perhaps come out of the end of one of the rack tubes?

Last edited by dsbrantjr; 12-21-19 at 07:57 PM.
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Old 12-21-19, 08:04 PM
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Possibly a plug for an unused bottle cage mount?
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Old 12-21-19, 08:15 PM
  #11  
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Doesn't look like something from a bike.

Also, you could ask for some cable cutters for Christmas.
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Old 12-22-19, 06:12 AM
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Originally Posted by dsbrantjr View Post
That looks like a plug for a rack mounting hole. Look on the other side of the bike to see if there is one like it there someplace.
Edit: Did it perhaps come out of the end of one of the rack tubes?
+1 on the end of the rack tubes. The open end can lead to water inside it and consequently rust, unless itís aluminum. If thereís no other one on the other side, Iíll assume itís missing too. Measure the openings and look for rubber plugs somewhat wider than it for a snug fit replacement.
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Old 12-22-19, 07:26 AM
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It came from the deep.
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Old 12-22-19, 08:32 AM
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That is a plug from the end of the tube on the bottom of your rear rack, near the derailleur.
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Old 12-22-19, 12:37 PM
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It may indeed have come from the deep. Except the confusing thing is that it came from at least the height of the hub or above (as I said, the bike was upside down when I lifted the wheel from the frame). I may not have made it's size clear; the attached photo shows that it is smaller than the rack tube diameter. The only thing it remotely matches is the small holes in the brake shoes. But even then, it's too small and it fell from above there anyway.

It's clearly some kind of dust cap, so it's not mechanically important, I'm just neurotic and would like to put it back.

And the neuroticism accounts for not cutting my cables; due to various screw ups, I had to rethread that cable three times, so I was glad that I didn't cut it. Then I left it to insure against further cock ups.

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Old 12-22-19, 01:26 PM
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Well, if you say that it's 4mm in diameter, then it's probably a plug for M5 threaded hole, or a 4mm hole. Maybe it's the drainage hole in your stays, or a threaded mounting hole, like for a rear kickstand. I don't think anyone can tell you anything more, since we can't see your bike. Only you can see it, unless you showed every inch of your bike frame, but if you put the effort into taking all those photos, then you'd probably be able to find the hole yourself.
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Old 12-22-19, 02:33 PM
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Originally Posted by shelbyfv View Post
I think that's off the bottom of your coffee maker.
I'll vote for the coffee maker too. Although......🤔
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Old 12-22-19, 04:47 PM
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Thank you all for taking a look! Who knows; a mystery. I'll keep the plug with me. Maybe for years at this rate. Then one day I'll be able to fix someone's coffee maker.
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Old 12-22-19, 04:52 PM
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Originally Posted by elgrande View Post

And the neuroticism accounts for not cutting my cables; due to various screw ups, I had to rethread that cable three times, so I was glad that I didn't cut it. Then I left it to insure against further cock ups.

Clearly the previous photo of that plug did not provide sufficient information as to its size. As for the cable, the way you have bent it after it exits the pinch bolt pretty much spoils its usefulness if you have to lengthen the cable run. Even then, most of the time a cable has been affixed by the pinch bolt the pinch point deforms the cable and creates extra friction inside the cable housing.
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Old 12-22-19, 04:54 PM
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Originally Posted by elgrande View Post
Thank you all for taking a look! Who knows; a mystery. I'll keep the plug with me. Maybe for years at this rate. Then one day I'll be able to fix someone's coffee maker.
If you lose it you will immediately, figure out what it goes to.
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Old 12-22-19, 06:04 PM
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Did it perchance come off the pivot bolt of your brake caliper?

Cheers
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Old 12-22-19, 08:54 PM
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elgrande
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A good shout. But I've checked and no. That would also have required it to defy gravity. It's such a mystery.
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Old 12-22-19, 10:50 PM
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Water bottle mount hole
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Old 12-23-19, 03:23 AM
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Cut that shifter cable and put a crimp on it. I've never seen that done with a tag end before.
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Old 12-23-19, 04:23 AM
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Originally Posted by elgrande View Post
Thank you all for taking a look! Who knows; a mystery. I'll keep the plug with me. Maybe for years at this rate. Then one day I'll be able to fix someone's coffee maker.
The easiest way to determine this is to throw the plug away. One day after the trash man comes you'll be made aware of how important and hard to find it was
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