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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-17-14, 07:54 PM   #1
cuber351
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This is my rear derailer

http://i.imgur.com/0xyri8S.jpg





What do I do?

Last edited by no1mad; 06-17-14 at 08:32 PM. Reason: embedded pic
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Old 06-17-14, 08:40 PM   #2
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Is your b screw still there?

Or has it always been that way?
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Old 06-17-14, 08:54 PM   #3
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Yes I believe so. I'm confident in knowing how to locate the H and L screws but I'm not sure about the B screw. Although there are three similar looking screws on the derailer. Sadly it didn't come like this. Was trying to change gears and what you see in the picture happened.
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Old 06-17-14, 09:17 PM   #4
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Looks like the spring that supplies tension to the cage & chain got disconnected .... or something like that.

ps. Your picture is upside down.
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Old 06-17-14, 09:23 PM   #5
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Well you ask a very basic question. My answer assumes that you have some understanding on dérailleur arrangement, or can access the interweb and figure out stuff from looking at photos.

First thing i might do is to remove the rear wheel. Then examine it. Rim true, axle bent, spokes distorted, cog teeth not damaged. Then go to the der. You need to understand the cage position with out the wheel in place. If you can do this then you'll see if the cage's wind up is affected. Is the cage/der/hanger bent/twisted. Are any of the der's parallelogram links distorted. Next is the chain. Are any links twisted/distorted. Are any side plates pulling off their pins.

Then if all looks good (which I doubt but the single photo is hard to fully see all the aspects) remount the wheel with the der cage and chain properly configured and go through all the above again.

If you're unable to understand any of this then you might seek the advice of your LBS. Andy.
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Old 06-17-14, 09:26 PM   #6
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That big spring that connects the derailer to the pulleys has indeed been disconnected. I don't know what I'm saying but I believe there's a piece missing. I believe that piece is what holds the rod (you can kind of see it through that slot on the derailer) inside the spring connected to the derailer.
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Old 06-17-14, 09:30 PM   #7
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Well you ask a very basic question. My answer assumes that you have some understanding on dérailleur arrangement, or can access the interweb and figure out stuff from looking at photos.

First thing i might do is to remove the rear wheel. Then examine it. Rim true, axle bent, spokes distorted, cog teeth not damaged. Then go to the der. You need to understand the cage position with out the wheel in place. If you can do this then you'll see if the cage's wind up is affected. Is the cage/der/hanger bent/twisted. Are any of the der's parallelogram links distorted. Next is the chain. Are any links twisted/distorted. Are any side plates pulling off their pins.

Then if all looks good (which I doubt but the single photo is hard to fully see all the aspects) remount the wheel with the der cage and chain properly configured and go through all the above again.

If you're unable to understand any of this then you might seek the advice of your LBS. Andy.
Yeah I think I'm just gonna take it in and get it fully tuned up. I did notice a bit of a wheel wobble looking at the cassette.
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Old 06-17-14, 09:37 PM   #8
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The wheel and the cassette/freewheel are two different parts and a wobble in one doesn't transfer to the other usually. This is exactly the reason i suggest a pro looks at the bike. Your inability to describe the detail or nuance is common and why shops are helpful. Andy.
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Old 06-18-14, 03:49 AM   #9
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Turn the bike upright and get a better picture, the derailleur shouldn't be hanging off of the back like it is, it appears the hanger is in the wrong location. The derailleur body should be toward the front side of the cassette.
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Old 06-18-14, 05:43 AM   #10
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Turn the bike upright and get a better picture, the derailleur shouldn't be hanging off of the back like it is, it appears the hanger is in the wrong location. The derailleur body should be toward the front side of the cassette.
I think that I'm pretty good with spacial relationships, but it surprises me how disoriented I can become looking at a bicycle derailleur upside down.
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Old 06-18-14, 05:49 AM   #11
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The exposed spring should be in the body just "below" the spring. Clearly the retaining capability has been compromised.
My suspicion is that you will need to replace the RD as it is a low cost item. Find a Coop near you and ask for a replacement from their used bin. Most likely you will find a better RD.


1. Remove the jockey wheels so you don't have to break the chain.
2. Disconnect the cable
3. Remove the RD to take with you.
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Old 06-18-14, 09:59 AM   #12
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There's a transverse pin in the derailleur's P knuckle that retains the cage pivot shaft. Looks like you lost the pin allowing the shaft and spring to come out.
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Old 06-18-14, 10:27 AM   #13
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It's come apart , Broken .. Go buy a new one .. it wont cost much , the one you have was from a low price group.
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