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Rear derailleur mounting screw broken

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Rear derailleur mounting screw broken

Old 10-04-19, 10:36 AM
  #1  
Danyidk69
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Rear derailleur mounting screw broken

So idk how i managed to do this but i broke the mounting screw on my rear derailleur.. so the head of the screw broke and the derailleur comes off.. the rest of the screw is still stuck on the frame. any idea on how i can fix this? the bike is avigo 26 Downhill and the derailleur is an velotec..
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Old 10-04-19, 10:57 AM
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Remove the wheel and drill out the screw from the inside, starting with a small bit and working up to a larger one. At some point the screw will back itself out. You will likely need a new derailleur as the screws are typically not available as replacement parts, but they are usually not too costly.
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Old 10-04-19, 11:00 AM
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I looked online for a shimano velotec rd but I cant find anything
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Old 10-04-19, 11:29 AM
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Originally Posted by Danyidk69
I looked online for a shimano velotec rd but I cant find anything
Those 2 names don't relate.
Does it actually say SHIMANO on the RDER? IF it does, it's such a low end DER, it's not available to the public.

Looking at what I think is your bike, it's a low end X-mart bike.
Shimano makes a Tourney Model with a claw adapter that although lower end, is superior to what's on it.
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Old 10-04-19, 11:31 AM
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thats all i see written on it. the pullies and cassette have shimano written on it and velotec is written on the rd casing
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Old 10-04-19, 11:34 AM
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Ok, the Avigo appears to be what we here call a "Bicycle Shaped Object" (BSO). The bike has front and rear suspension and retailed for ... $99. This is about the bottom of the barrel, quality-wise. There will be no replacement parts available. You can get help here, but be prepared for the case where you fix one thing, and another breaks.

Right now I'm not sure if the bolt you mean is the bolt for the derailleur hanger, or the one that goes through the derailleur body and screws into the hanger. The former is likely a standard sized bolt that will be readily avialble. The latter is larger and more specialized and I don't think you'll find it. So you may have to replace the RD.

Velotec does not appear to be a part that Shimano makes available as a replacement.

Take pics, post to google pics or imgur or another free fileserving site, and post the URL link to the pics. This will help zero in on your problem.
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Old 10-04-19, 12:32 PM
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A lot of these type bikes will have a few Shimano parts and some others that may be marginally compatible with Shimano. Sometimes these parts don't even work well with themselves.

Velotec is an unfamiliar name (partswise) and something that was probably a few cents cheaper than Shimano.
Shimano does make a very cheap RDER found on these type bikes that is unavailable to us. (Buy 10,000, they'll probably sell you some)

IF you are talking about the 5mm? screw that holds the claw on, have somebody knowledgeable just drill it out.
IF you haven't done this before, you'll probably screw it up without practice. (The 2nd one is usually much better than the 1st.....).

Worst case, you could possibly drill & tap it to the next larger size.
Is this the TYPE of mounting your RDER has?
https://www.amazon.com/Shimano-Tourn...55443404&psc=1
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Old 10-04-19, 12:46 PM
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Originally Posted by Danyidk69
So idk how i managed to do this but i broke the mounting screw on my rear derailleur.. so the head of the screw broke and the derailleur comes off.. the rest of the screw is still stuck on the frame. any idea on how i can fix this? the bike is avigo 26 Downhill and the derailleur is an velotec..
Have you got any photos of this? Can you grab any of the old bolt at all? Since there's no pressure on it, you may be able to back it out, if you can get a bite on any of it, or even tap it around with a small screwdriver. You might even be able to screw it all the way through (since the head of it is gone...).
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Old 10-04-19, 01:32 PM
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I cant post pics or links here because I dont have 10 posts
Anyway the screw is just a flat round tube and it has a nut looking base where it bolts into the frame. it had a spring and a washer on it and the rd was on top of this screw.
also I dont know if that rd would work. the rd that is on this bike dosent have that kind of mounting
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Old 10-04-19, 02:07 PM
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Like this-
https://www.amazon.com/Top-bike-Tour...a-524254547209
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Old 10-04-19, 02:14 PM
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it looks closer to what I have. but mine has no bracket. the mounting screw went trough the top piece of the rd.
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Old 10-04-19, 02:17 PM
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Danyidk69, As I mentioned, you can store a photo on google pics for free, and put the URL here. We can click on the URL to see the pic.

Is this what your bike looks like?


If so, is this what your derailleur looks like (roughly)? If so, is the bolt holding the hanger to the bike broken (1) or the bolt holding the derailleur to the hanger (2) broken? Or something else. From your description, it sounds like (2) is broken. If so, putting a new RD on the thing will be an upgrade! If you have a 7 cog rear freewheel, there are a lot of friction shifting RDs that will work. Not to be snotty, but just about all of them will offer a performance upgrade from what you had.

There's two types. One type has a built in hanger (both pics below). The other screws into a hanger. If its broke at (2) and your RD bolts to the hanger you probably can drill the bolt remnant out of the hanger. If its a built-in hanger model, just buy a new RD (about 15 bucks).




Here is a Shimano Tourney (Tourney RD-TY500 6/7-Speed Long Cage Rear Derailleur with Frame Hanger) with built-in hanger:


Last edited by WizardOfBoz; 10-04-19 at 02:35 PM.
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Old 10-04-19, 02:32 PM
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Originally Posted by WizardOfBoz
Danyidk69, As I mentioned, you can store a photo on google pics for free, and put the URL here. We can click on the URL to see the pic.

Is this what your bike looks like..........


Note this bike has Shimano written on it, but that is "less than" a Shimano RDER.
I think the cogs look rather "klunky" compared to "S".
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Old 10-04-19, 02:37 PM
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Originally Posted by Bill Kapaun
Note this bike has Shimano written on it, but that is "less than" a Shimano RDER.
I think the cogs look rather "klunky" compared to "S".
Agree, Bill, but that IS a picture of the rear of an Avigo Downhill. Model specs change, of course.
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Old 10-05-19, 12:11 PM
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Screw 1 is broken on mine
and im not allowed to post links or pics here
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Old 10-05-19, 01:23 PM
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Originally Posted by Danyidk69
Screw 1 is broken on mine
and im not allowed to post links or pics here

A LBS or bike coop should have plenty of those from removed broken DERs.

Here is one on ebay with a new nut to go with it

https://www.ebay.com/itm/132499253144

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Old 10-05-19, 01:41 PM
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Originally Posted by Danyidk69
Screw 1 is broken on mine
and im not allowed to post links or pics here
Most anyone that works on bikes on a regular basis should have those bits in their spare "widgets" bin,
Many of these bikes either get scrapped or cannibalized for possibly useful items.
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Old 10-06-19, 01:00 PM
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So I decided to just replace the entire rd. any idea on what rd would be compatible with this bike?
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