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Chain fell of the end of the large rear ring & snapped derailleur & chewed up carbon

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Chain fell of the end of the large rear ring & snapped derailleur & chewed up carbon

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Old 06-23-15, 07:12 PM
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Chain fell of the end of the large rear ring & snapped derailleur & chewed up carbon

Man this sucks.

Month old bike. I am very worried about the fact that it chewed into the carbon.

Is my bike screwed?

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Old 06-23-15, 07:18 PM
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Did you buy it new from a shop? If so I would talk to them. There should be some warranty on it
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Old 06-23-15, 07:19 PM
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Originally Posted by rms13
Did you buy it new from a shop? If so I would talk to them. There should be some warranty on it
Yes I did. I will take it in tomorrow and see what I can get done.
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Old 06-23-15, 07:22 PM
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Originally Posted by rms13
There should be some warranty on it
'specially if they took off the dork disc.
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Old 06-23-15, 07:25 PM
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Originally Posted by WhyFi
'specially if they took off the dork disc.
Dork disc?
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Old 06-23-15, 07:27 PM
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Dork disc should have caught that!
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Old 06-23-15, 07:33 PM
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Originally Posted by rbk_3
Dork disc?
It's a round plastic disc that fits onto the spokes behind the cassette to keep the chain from getting into the spokes when/if this very situation happens.
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Old 06-23-15, 07:34 PM
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Well I looked it up. It did have a dork disc before but it isn't on there anymore.
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Old 06-23-15, 07:40 PM
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Originally Posted by Ayers
It's a round plastic disc that fits onto the spokes behind the cassette to keep the chain from getting into the spokes when/if this very situation happens.
Which most owners remove because it's unnecessary assuming the derailleur limit screws have been set correctly. So if your dealer removed it, AND they didn't set the limit correctly, it seems they have some culpability in the matter.
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Old 06-23-15, 07:41 PM
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Bad adjustment. Somebody's fault.
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Old 06-23-15, 07:42 PM
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It was on there and I didn't remove it. It must have fallen off when it happened?
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Old 06-23-15, 08:18 PM
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Unlikely that it came off, as it lives between the cassette and the spokes. Most of us remove them because they are ugly, but the limit screw has to be set properly to make sure the chain does not come off.

Hopefully your shop will step up, but in the worst case (and this doesn't look too bad, at least from here), carbon can be repaired.
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Old 06-23-15, 08:23 PM
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Another possible cause is an improperly set up chain. A stiff link or the pin not put in properly where the chain was broken can cause the chain to jump off like this.
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Old 06-23-15, 08:26 PM
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Originally Posted by GuitarBob
Unlikely that it came off, as it lives between the cassette and the spokes. Most of us remove them because they are ugly, but the limit screw has to be set properly to make sure the chain does not come off.

Hopefully your shop will step up, but in the worst case (and this doesn't look too bad, at least from here), carbon can be repaired.
Well I went back to the scene and found it. It was dark and couldn't find the other piece.



It is a Trek Emonda. How is Trek about replacing frames? I know they have a lifetime warranty but I doubt this falls under it.

This really sucks, 2k is a ton of money for me to spend on a bike.
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Old 06-23-15, 08:28 PM
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Originally Posted by rbk_3
Well I went back to the scene and found it. It was dark and couldn't find the other piece.

Seems they're not very useful even when installed. Good to have to take to the shop.
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Old 06-23-15, 08:28 PM
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Unless OP made adjustments himself on the derailleurs than the shop is at fault. On my bike its impossible to throw the chain off the rear cog because the limits are set correctly
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Old 06-23-15, 08:31 PM
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Wow, look at that--glad you found it. Unfortunate that it didn't fulfill its mission. Good luck.
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Old 06-23-15, 08:33 PM
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Dang hope the shops help you out as if they set it up correct the rear mech should nevet be able to touch the spokes but for maybe in a crash? Also in the second picture your rear mech appers to be on part on the rear mech hanger. If my eyes dont fool me i hope thats a replaceable one. As if the shop doesnt help you, and the mech hanger is carbon. I would look into carbon repair by a place like predator cycling. Will look on a computer when i get home hard to see on a tiny screen. Best of luck man
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Old 06-23-15, 08:33 PM
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Originally Posted by rms13
Unless OP made adjustments himself on the derailleurs than the shop is at fault. On my bike its impossible to throw the chain off the rear cog because the limits are set correctly

Yea I didn't touch anything, would have no idea what I am doing any way plus the shop offers a year free tune ups so if I was having issues I would have taken to them.

It is a reputable shop so I really hope they will help me out.
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Old 06-23-15, 08:37 PM
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Originally Posted by Damien09
If my eyes dont fool me i hope thats a replaceable one.
That was my take as well. OP, that broken bit attached to the derailleur (if we're right) is easily replaced, so if the damage to the carbon is light, you'll be back in business in no time.
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Old 06-23-15, 08:40 PM
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Originally Posted by Damien09
Dang hope the shops help you out as if they set it up correct the rear mech should nevet be able to touch the spokes but for maybe in a crash? Also in the second picture your rear mech appers to be on part on the rear mech hanger. If my eyes dont fool me i hope thats a replaceable one. As if the shop doesnt help you, and the mech hanger is carbon. I would look into carbon repair by a place like predator cycling. Will look on a computer when i get home hard to see on a tiny screen. Best of luck man
Oh wow, I don't even realize the dereuailler was attached to the frame like that. The carbon is completely broken off

It looks like the top bar joins the bottom there via screw but it is only 1 screw and doesn't look replaceable. So I guess the frame is shot.


edit

Here is a closer look for you guys. Those 2 little screws come out to replace that piece ?




edit 2

I am pretty sure look at it it is chipped right off the frame and not replaceable.
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Old 06-23-15, 08:52 PM
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Originally Posted by rbk_3
It was on there and I didn't remove it. It must have fallen off when it happened?
Not possible.

You may be out of luck.

"Somebody stole my dorm disc as I dropped my chain" is a weak argument and even if you added it on after the crash the damage would not be possible.

Legally, you don't have a leg to blame someone else, unless you live in some country that allows frivolous law suits.
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Old 06-23-15, 08:53 PM
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Originally Posted by BigJeff
Not possible.

You may be out of luck.

"Somebody stole my dorm disc as I dropped my chain" is a weak argument and even if you added it on after the crash the damage would not be possible.

Legally, you don't have a leg to blame someone else, unless you live in some country that allows frivolous law suits.

See post #14

It certainly is possible.
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Old 06-23-15, 08:56 PM
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Originally Posted by rbk_3
Oh wow, I don't even realize the dereuailler was attached to the frame like that. The carbon is completely broken off

It looks like the top bar joins the bottom there via screw but it is only 1 screw and doesn't look replaceable. So I guess the frame is shot.


edit

Here is a closer look for you guys. Those 2 little screws come out to replace that piece ?




edit 2

I am pretty sure look at it it is chipped right off the frame and not replaceable.
yes, if it has screws, it is replacable.
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Old 06-23-15, 09:03 PM
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Yea I took off the wheel and it is thankfully.

What can I do about the frame scuffs? It doesn't look like they are too deep, mostly the clear coat.
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