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Commuting Bicycle commuting is easier than you think, before you know it, you'll be hooked. Learn the tips, hints, equipment, safety requirements for safely riding your bike to work.

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Old 02-25-11, 10:59 AM   #1
Sawtooth
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Deraileur Failure=Call of Shame Last Night

Had to make the call of shame last night and have my wife come get me.

I think the problem might be coming from my rear der. but I am not sure. Maybe you guys can look at the picture and help me figure out what is wrong? LOL


Not sure how it happened. I am running a new compact and did a quick dump into the small ring at the same time as swinging into the big gears on the back AT THE SAME TIME as I was cranking hard off of the road and onto a grass bank to avoid some construction. I think it the rear der. was tweaked to the max at the same time that I might have had a just enough lateral wheel deflection to move a spoke into the lower pulley. Once it caught, my ride (and my hanger, and possibly my der.) was shot.

I have a chain tool and could have made a single speed to get home but I could not for two reasons:
1) I did not want to break the chain if I don’t have to (I never seem to trust them after that)
2) I cannot get the spoke out of the rear pulley so the wheel can move freely. I am going to have to remove the pulley to get it off.

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Last edited by Sawtooth; 02-25-11 at 07:09 PM.
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Old 02-25-11, 11:17 AM   #2
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Wow, the exact same thing happened to me last week.
The chain jumped out the jockey wheel, pushing the RD
to the spokes. When the RD got caught in the wheel, the
whole wheel jumped out of the dropouts.


Jammed wheel by 1nterceptor, on Flickr
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Old 02-25-11, 11:34 AM   #3
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Wow, the exact same thing happened to me last week.
The chain jumped out the jockey wheel, pushing the RD
to the spokes. When the RD got caught in the wheel, the
whole wheel jumped out of the dropouts.


Jammed wheel by 1nterceptor, on Flickr
Dang! Yeah, I don't need a picture after all. That is exactly what mine looked like.
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Old 02-25-11, 12:14 PM   #4
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Your top pulley was likely too close to your cassette I had that problem with a very sim. end. That is also why to this day I run nerd disks
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Old 02-25-11, 12:16 PM   #5
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There's no shame in a 'mechanical' phone call. Everyone in the commuter forum is allowed 1 mulligan per winter.
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Old 02-25-11, 12:21 PM   #6
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The system is not built to handle shifting the front and the back at the same time.
Even though it can be done sometimes, there is too much slack to control at one time.
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Old 02-25-11, 12:22 PM   #7
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Maybe your DR hanger was already somewhat bent and your double-shifting put it over the edge.

As far as not trusting a chain after it's been broke...are you nuts? Get yourself a power link, your life with R&Ring and maintaining chains will be much easier. Trust me...and the chain.
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Old 02-25-11, 12:36 PM   #8
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I'll give you two guesses. First, the derailer limit screw wasn't set right. Second, your chain developed a stiff link that pulled the derailer up and in. Make sure you keep the chain lubed, especially in wet weather or cold with salty roads. It's all too easy to forget to lube the chain for a month, or two, and then you remember why it was so important!

BTW, that's what those dorky looking clear plastic plates called spoke protectors are for. Sometimes they work, sometimes they don't. But they're cheap compared to a new derailer!
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Old 02-25-11, 01:15 PM   #9
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The system is not built to handle shifting the front and the back at the same time.
Even though it can be done sometimes, there is too much slack to control at one time.
Haven't heard that before. I do it all the time and I know many others that do so as well.
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Old 02-25-11, 02:15 PM   #10
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^^Ditto I double shift all the time.
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Old 02-25-11, 02:53 PM   #11
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I used to double shift all the time with my STI levers. Don't do it any more with my friction shifting. When my freewheel seized up I wound the RD around the rear axle similar to this, but it stayed out of the wheel. I shortened the chain to make it a single speed and it held up nicely for the ride home, and another 1200 km beyond that once I put the extra links back in to fit the new RD. Always carry a chain tool. A few links would be nice too.
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Old 02-25-11, 03:07 PM   #12
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As far as not trusting a chain after it's been broke...are you nuts? Get yourself a power link, your life with R&Ring and maintaining chains will be much easier. Trust me...and the chain.
Agree. Sometimes powerlinks are hard to get apart, so I'll just break the chain again and install another powerlink when I am done. Doesn't hurt a thing...
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Old 02-25-11, 05:21 PM   #13
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It can get even uglier with a steel frame and non-replaceable hanger:



I had to replace half of the drive-side spokes, replace the chain, get the hanger straightened and of course replace the derailleur. The mechanic at the LBS said he once had his STI lever gutted by the shift cable in a mishap like this.

BTW, you have disc tabs on your Major Jake?? What year is it?
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Old 02-25-11, 06:54 PM   #14
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Ugghh! Andy K...were you able to fix that with a pair of chanel locks?
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Old 02-25-11, 06:55 PM   #15
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Quote:
Originally Posted by chipcom View Post
Maybe your DR hanger was already somewhat bent and your double-shifting put it over the edge.

As far as not trusting a chain after it's been broke...are you nuts? Get yourself a power link, your life with R&Ring and maintaining chains will be much easier. Trust me...and the chain.
I am certainly a big fan of power links, but I had never thought of using more than one for a chain that I had to temporarily shorten. Good idea.
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Old 02-25-11, 06:57 PM   #16
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Your top pulley was likely too close to your cassette I had that problem with a very sim. end. That is also why to this day I run nerd disks
Yeah, I suspect this is a result of somewhat sloppy preventative maintenance on the limit screw. I bet it just got a bit too far over.
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Old 02-26-11, 12:39 AM   #17
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Ugghh! Andy K...were you able to fix that with a pair of chanel locks?
Park actually makes a tool to straighten this. The LBS did it pretty cheap. The frame was the least of my troubles.
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