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My derailleur exploded

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My derailleur exploded

Old 11-23-12, 03:51 PM
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My derailleur exploded

I was riding the other day and my derailleur pretty much disintegrated - it literally sheared in half. Not too sure what happened, LBS mechanic seems to think when I shifted the front chainring my chain somehow caught a spoke and sucked everything into my wheel. Not under heavy load or anything.

The RD is/was a Shimano 105 9-speed. I have Trek Red Shield so hopefully some if not all of it will be covered... I'm in college so I'm not really looking forward to shelling out for a new RD/Chain/etc. Has anyone had anything like this happen before?

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Old 11-23-12, 03:54 PM
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Spoke Protector would have been good insurance.
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Old 11-23-12, 04:19 PM
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It's common... If your bike falls on the drive/right side or the derailleur gets bumped, then there may be no clearance between the rear wheel spokes and the RD when you shift into the lowest cog. Then it gets snagged, pulled back and up with the rotation of the wheel and looks like your picture...
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Old 11-23-12, 04:26 PM
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Check your spokes for damage. Replace any damaged ones - they will fail quickly if you don't.
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Old 11-23-12, 04:27 PM
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Hmmm... well as far as I know it didn't get bumped, certainly didn't fall, and I had already ridden like 10 miles before it happened
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Old 11-23-12, 06:35 PM
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APK, I have a spare Ultegra 6700 RD (long cage) that I am not using it.

I have a soft spot in my heart for "starving" college students. (Having been one myself and having two in college who ar enot starving due to Dad's generosity )

If Trek won't replace the RD and if you can use mine, you can have it (you just need to pay for shiiping).

Let me know and good luck.
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Old 11-23-12, 07:05 PM
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how to do you like the neuvation wheels? i like mine, but they seem a bit flexy...then again im 185lbs.

btw, sucks about the derailleur. my buddy had his break on our last ride...i gave him my apex der for $20
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Old 11-24-12, 05:13 AM
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Does anyone else notice that the actual derailleur itself sheared? Not the hanger, the hanger is still attached and by the looks of it, straight. That I find pretty damn interesting.
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Old 11-24-12, 05:19 AM
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Impossible to tell from the pic but did your chain break on one link and get a nasty kink??

That happened to me last year and caused the same problem, derailleur sheared into 2.
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Old 11-24-12, 05:24 AM
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I've never seen it happen, but the derailer getting bumped theory from milkbaby makes sense. My derailer was bent and the bike rode fine for at least 30 minutes, then the chain started jumping and eventually dropped. It happens.
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Old 11-24-12, 11:37 AM
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Originally Posted by 10 Wheels
Spoke Protector would have been good insurance.
Nope, that solves a different problem where the derailleur overshifts and drops the chain behind the largest cog.
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Old 11-24-12, 01:29 PM
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That never happens with campagnolo components
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Old 11-24-12, 01:38 PM
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Originally Posted by datlas
Impossible to tell from the pic but did your chain break on one link and get a nasty kink??

That happened to me last year and caused the same problem, derailleur sheared into 2.
I'm partial to this theory myself -- it explains the lack of spoke damage and the break in the RD rather than the hanger
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Old 11-24-12, 02:44 PM
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Originally Posted by Specialized2k10
how to do you like the neuvation wheels? i like mine, but they seem a bit flexy...then again im 185lbs.

btw, sucks about the derailleur. my buddy had his break on our last ride...i gave him my apex der for $20
I really like the Neuvations, had them for almost two years now and no problems. I'm about your weight also, although I haven't had much experience with more premium wheels!
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Old 11-24-12, 02:45 PM
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Originally Posted by datlas
Impossible to tell from the pic but did your chain break on one link and get a nasty kink??

That happened to me last year and caused the same problem, derailleur sheared into 2.
My chain is broken actually, part of one of the outer plates is bent outward although I'm not sure whether that was a cause or effect.

EDIT: When I say "broken" I mean unusable

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Old 11-24-12, 04:28 PM
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Interesting that the derailleur failed rather than the hanger. The hanger is designed to be a sacrificial piece to protect the more expensive frame and/or derailleur.
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Old 11-24-12, 05:07 PM
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Originally Posted by APKjuniorFL
My chain is broken actually, part of one of the outer plates is bent outward although I'm not sure whether that was a cause or effect.

EDIT: When I say "broken" I mean unusable
Here is what most likely happened:

1. Chain link fails, just on one side, so chain has bend/kink in it.
2. Section of chain with kink gets stuck in RD.
3. Pedaling force shears off RD.

Just curious, but what model chain and approx how many miles on it??
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Old 11-24-12, 05:15 PM
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Originally Posted by ultraman6970
That never happens with campagnolo components
Ooh, sniped again!
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Old 11-24-12, 05:17 PM
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And OP may I suggest a single speed. You hardly need dem gears in Florida lest you got a gale.
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Old 11-25-12, 02:21 AM
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Ok ok correction... always seen this with shimano and trek, ask andy schleck about it!

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Ooh, sniped again!
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