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Old 05-22-12, 12:52 AM   #1
GanJa786
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Rear Derailleur stuck in the spoke

Hey everyone,
My brother was riding his bike when he changed the gear all of a sudden rear deraiilleur got stuck in one of the spokes of the tire. I am a noob when it comes to fixing bikes. Infact i dont even ride them. I really want to fix it for my brother by myself before taking it to a repair shop. What is the easiest way to take it out of the spoke? Looking forward to replies. thx

Here are the pics:





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Old 05-22-12, 01:09 AM   #2
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Something is bent or broken, probably the mech hanger, although with no photo of this area, this can not be confirmed.

If it is the mech hanger, if you don't have a tool like a Park DAG-2 you may struggle to get the correct alignment for the hanger.

The derailluer may have also been broken by the spoke interaction, and that chain could do with some lube, are there any stiff links in it which caused this?

You will get more answers posting this sort of question in the Bicycle Mechanics forum, rather than the Road Cycling one.
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Old 05-22-12, 01:11 AM   #3
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First of all... there is a mech forum... but second... just undo the bolt that holds the pulley. It will come free.
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Old 05-22-12, 06:32 AM   #4
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Turn the wheel backwards and it should pop out. Then you need to find out WHY it went into the spokes. 3 common reasons.

1) Derailleur hanger (Part of frame the derailleur is attached to) is bent
2) Derailleur is bent
3) Low Limit screw is allowing the Derailleur to move too far and into the spokes.
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Old 05-22-12, 06:58 AM   #5
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And the spoke the derailleur is caught on almost certainly will need to be replaced. Any nicks in it will turn into stress risers and the spoke will break relatively quickly.
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Old 05-22-12, 12:18 PM   #6
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Just for what it is worth. I had almost the same thing happen to me 2 weeks ago. In my case one of the sideplates on my chain broke and it threw the derailler into the back wheel. I had to remove the derailler to walk the bike home. I would bet that the problem on your brother's bike was caused by the chain.

The derailler was bent, and the derailler hanger was bent. I replaced the chain and got the derailler and derailler hanger straight enough to function. My replacemnet derailler should be at the house tonight.
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Old 05-22-12, 01:26 PM   #7
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Originally Posted by Homebrew01 View Post
Turn the wheel backwards and it should pop out. Then you need to find out WHY it went into the spokes. 3 common reasons.

1) Derailleur hanger (Part of frame the derailleur is attached to) is bent
2) Derailleur is bent
3) Low Limit screw is allowing the Derailleur to move too far and into the spokes.

I'm going to go with #3 as it looks like the low limit screw is actually missing. If screws are falling out and things are a bit rusted then go ahead and take it by the shop. Its a lot cheaper than dental work and you'll need another screw at the very least. If you have already remove the derailleur make sure they take a close look at the spokes as there is bit of bend going on there too.
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Old 05-22-12, 01:28 PM   #8
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Quote:
Originally Posted by jimc101 View Post
Something is bent or broken, probably the mech hanger, although with no photo of this area, this can not be confirmed.

If it is the mech hanger, if you don't have a tool like a Park DAG-2 you may struggle to get the correct alignment for the hanger.

The derailluer may have also been broken by the spoke interaction, and that chain could do with some lube, are there any stiff links in it which caused this?

You will get more answers posting this sort of question in the Bicycle Mechanics forum, rather than the Road Cycling one.
Is this the derailler hanger (See yellow arrow):


that u said i have to check for if its bent or broken?

Well tbh i just bought this bicycle from garage sale. After two days of riding it. It started to run stiff like i would ride it for 5 seconds and it wouldnt go forward at all seems like something was stuck somewhere so i checked if it was the brakes being too close to the tire - that wasnt the case so i tried changing the gear and all of a sudden this happened - derailler got stuck.
Yes i will lube the chain.

Sorry i am new here. I would appreciate if someone can move this thread to mechanics forum. thx
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Old 05-22-12, 01:30 PM   #9
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Yes, that is the hanger. On most better quality bikes, the hanger is actually part of the frame. In your case, the frame doesn't have a hanger, so your derailleur has what's called a "claw"

By the way, your wheels should be loosened then pulled further back into the frame dropout. Looks like it's about to fall out.

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I'm going to go with #3 as it looks like the low limit screw is actually missing. If screws are falling out and things are a bit rusted then go ahead and take it by the shop. Its a lot cheaper than dental work and you'll need another screw at the very least. If you have already remove the derailleur make sure they take a close look at the spokes as there is bit of bend going on there too.
Good eye.
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Old 05-22-12, 01:31 PM   #10
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First of all... there is a mech forum... but second... just undo the bolt that holds the pulley. It will come free.
do u think u can circle on the picture that i posted where i have to open the bolt? thx
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Old 05-22-12, 01:32 PM   #11
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Turn the wheel backwards and it should pop out. Then you need to find out WHY it went into the spokes. 3 common reasons.

1) Derailleur hanger (Part of frame the derailleur is attached to) is bent
2) Derailleur is bent
3) Low Limit screw is allowing the Derailleur to move too far and into the spokes.
i think it got stuck because my brother changed the gears to the lowest all of a sudden because the bike was running stiff like it wouldnt go forward at all.
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Old 05-22-12, 01:34 PM   #12
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Originally Posted by achoo View Post
And the spoke the derailleur is caught on almost certainly will need to be replaced. Any nicks in it will turn into stress risers and the spoke will break relatively quickly.
I can certainly look into that once i get it out of the spoke. Also would it make any difference if i have one missing spoke on my wheel?
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Old 05-22-12, 01:35 PM   #13
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Originally Posted by GanJa786 View Post
do u think u can circle on the picture that i posted where i have to open the bolt? thx
The lower pulley wheel of the derailleur that the chain runs along. My guess is it will just come out if you carefully move the wheel backwards and pull a bit with your fingers. No need to take things apart (probably).
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Old 05-22-12, 01:37 PM   #14
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I can certainly look into that once i get it out of the spoke. Also would it make any difference if i have one missing spoke on my wheel?
You need all the spokes to keep the rim straight. I bet the spoke is ok. Doesn't look like much damage occured.
Go to a shop to get the low limit screw fixed, derailleur adjusted, and ask them to look at the spoke.

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Sorry i am new here. I would appreciate if someone can move this thread to mechanics forum. thx
You can click the little triangle/exclamation mark to send a note to a moderator and ask them.
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Old 05-22-12, 01:42 PM   #15
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Turning the wheel backwards should free the spoke from the jockey wheel and I would do this gently as if it does not release easily you will need to remove the jockey wheel which should require an 8mm wrench.

If that goes smoothly then it is time to go over the bike and discover why this happened.

The position of the derailleur indicates that the bike is also running a chain that is far too short and that the derailleur pivot and spring may be toast... it is a very low end Shimano so rather than look for a set screw, I would just replace it with something better. Your derailleur uses a claw to attach it to the bike so you may need to get an adaptor claw for a newer rear D.

If you have a local bike co-op or shop that carries a decent selection of used parts they should be able to hook you up for very little $ and be able to show you how to service other things and fit a new chain.
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Old 05-22-12, 01:43 PM   #16
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I'm going to go with #3 as it looks like the low limit screw is actually missing. If screws are falling out and things are a bit rusted then go ahead and take it by the shop. Its a lot cheaper than dental work and you'll need another screw at the very least. If you have already remove the derailleur make sure they take a close look at the spokes as there is bit of bend going on there too.
can u please point out where the low limit screw is in the picture. Thing is i only bought this bike for $20 and i dont want to spend lot of money on it so am trying to do it all bymyself as much as i can. thx for ur reply. No i havent removed the derailleur yet
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Old 05-22-12, 01:45 PM   #17
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can u please point out where the low limit screw is in the picture. Thing is i only bought this bike for $20 and i dont want to spend lot of money on it so am trying to do it all bymyself as much as i can. thx for ur reply. No i havent removed the derailleur yet
Look at the upper left of your picture where there is one screw and a hole where a screw is supposed to be.

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Old 05-22-12, 01:46 PM   #18
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Yes, that is the hanger. On most better quality bikes, the hanger is actually part of the frame. In your case, the frame doesn't have a hanger, so your derailleur has what's called a "claw"

By the way, your wheels should be loosed then pulled further back into the frame dropout. Looks like it's about to fall out.



Good eye.
@Bold Not sure what u mean by that?
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Old 05-22-12, 01:47 PM   #19
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Originally Posted by GanJa786 View Post
Is this the derailler hanger (See yellow arrow):


that u said i have to check for if its bent or broken?

Well tbh i just bought this bicycle from garage sale. After two days of riding it. It started to run stiff like i would ride it for 5 seconds and it wouldnt go forward at all seems like something was stuck somewhere so i checked if it was the brakes being too close to the tire - that wasnt the case so i tried changing the gear and all of a sudden this happened - derailler got stuck.
Yes i will lube the chain.

Sorry i am new here. I would appreciate if someone can move this thread to mechanics forum. thx
Your wheel also needs to be backed into the drop out completely... it is too far forward.
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Old 05-22-12, 01:47 PM   #20
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Originally Posted by GanJa786 View Post
can u please point out where the low limit screw is in the picture. Thing is i only bought this bike for $20 and i dont want to spend lot of money on it so am trying to do it all bymyself as much as i can. thx for ur reply. No i havent removed the derailleur yet
In the 4th picture in your first post, you can see a little phillips head screw. Just above that is a hole where another screw should be. There are supposed to be 2 limit screws: "high" and "low". One controls how far outward (away from spokes to the high gear) the derailleur can go. The other controls how far inward (towards the spokes, or low gear) it can go.

Here's a good repair site: http://www.parktool.com/blog/repair-help
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Old 05-22-12, 01:50 PM   #21
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You guys have this one covered... am going to step off as even if we are saying the same thing it could get confusing and I have a shop full of work here.

Have to appreciate the excellent photos from the OP... most people have no idea how much this helps to diagnose things by remote.
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Old 05-22-12, 01:51 PM   #22
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@Bold Not sure what u mean by that?
Just above your yellow arrow, you can see the slot next to the axle nut. The axle should be pulled back into that slot so it's not visible.

As SixtyFiver mentioned, your chain is too short. So when you are on the big chainring on the crank, there will not be enough chain to also go into the big sprockets on the back wheel.
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Old 05-22-12, 03:13 PM   #23
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I have been too many forums before whenever i have some technical problem such as computers etc. But i have never received this good of a response. I really appreciate all of u who replied so fast and were very helpful. Tbh i am a kinda of a person who always likes to fix things first on my own before going to a shop and give them my hard earned money. Because of all ur help i was able to get the derailleur out of the spoke by just pedalling the wheel backwards. Now the other problem still remains which is whenever i ride a bike it rides fine for a couple of seconds and then it starts to make this noise that something is stuck or jammed and i have to paddle very hard and eventually i am not able to pedal anymore. Then when i fully stop and start to pedal again it works fine for few seconds and same thing happens. I am pretty sure noise is coming from the back wheel. When i am off the bike and just spinning the pedal with my hand , back wheel moves fine. So this problem is happening when i am riding the bike.Also I am not sure if the back brake suppose to be that close to the back wheel? May be its the brake? See the pic below.

Heres the brake on my back wheel
This one is not too close to the wheel:

This one is almost touching the wheel:



I also think derailleur is too close to the wheel as i am missing low limit screw

Heres the sound that i hear when riding my bike:
http://snd.sc/Lp47Lb



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Old 05-22-12, 03:49 PM   #24
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Just above your yellow arrow, you can see the slot next to the axle nut. The axle should be pulled back into that slot so it's not visible.

As SixtyFiver mentioned, your chain is too short. So when you are on the big chainring on the crank, there will not be enough chain to also go into the big sprockets on the back wheel.
I tried to hammer the axle nut inside but it wasnt moving so i took it out and as u can see its impossible to move it inside:


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Old 05-22-12, 04:20 PM   #25
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Your rear derailleur is bent pretty bad. needs to be straightened out. You can easily tell in the picture that shows it from behind. the derailleur cage (the part with the 2 small wheels that the chain runs around) should be perfectly in line with the gears above it, not slanted towards the wheel like it is currently. Happens when people drop their bikes on the ground on that side.

You need to loosen the nut on both sides of the wheel, not just the one side before it will move.
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