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PostPosted: Fri Sep 21, 2012 12:18 am 
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Joined: Sat Jan 21, 2006 6:13 pm
Posts: 361
farm_lim wrote:
@maverick
sorry for confusing you. yes mr_tim is right. was shifting from 21 (3rd to last) to 23 (2nd to last) when it happened.

@sedluk
rd didnt touch a spoke at all, i wasnt even on the last cog yet and rd didnt get into the wheels as ive said initially. yes, im lucky!


Approx how many miles on this unit when it broke?


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PostPosted: Fri Sep 21, 2012 2:03 am 
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Joined: Fri Sep 12, 2008 3:58 am
Posts: 363
Location: cebu, philippines/ hong kong
@redracer, 13mos, approx 7000km

got the rd back from the retailer last night. not bad 4day turnaround.
the upper/lower knuckles and parallelogram assembly were replaced. :thumbup: they installed the existing cages, bolts and dirty pulleys back.
Image

Image

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you cant buy fitness, but you can buy advantage.


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Posted: Fri Sep 21, 2012 2:03 am 


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PostPosted: Fri Sep 21, 2012 6:34 am 
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in the industry
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Joined: Sun Nov 21, 2004 2:45 pm
Posts: 2915
Location: London, UK
bm0p700f wrote:
I had a bloke come in shop with a chorus mech all carbon that gave up in a similar way. I suppose the aluminium cages were more likely to bend before breaking you normally had a bit of warning.

All carbon? It's allloy on Chorus and Record isn't it?


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PostPosted: Fri Sep 21, 2012 6:09 pm 
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Joined: Tue Jul 27, 2010 8:31 pm
Posts: 1049
Redracer,

in my case the mech had done just over 2000km - no more. If it had been my main bike,that would have been a month and half of riding at best.


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PostPosted: Mon Sep 24, 2012 2:46 pm 
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Joined: Fri Jun 15, 2012 2:27 pm
Posts: 164
Location: Gaithersburg, Maryland
As much as I love the new SR carbon rd, I am happy with my older Record 10spd set up. It may weigh more and not be as blingy but dang if I'm not worried about it snapping on me like that. Now don't get me wrong, if I had the money, I would buy the SR in a heart beat, breaking be damned!

Glad you got it repaired! I'm assuming they warrantied it all for you right?

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09 Pinella w/ Record 10spd
http://1spd.blogspot.com/


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PostPosted: Mon Sep 24, 2012 3:20 pm 
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Joined: Sun Oct 05, 2008 8:09 pm
Posts: 1388
Location: Aix en Provence
I am going to check my limit screw now :D


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PostPosted: Mon Sep 24, 2012 5:11 pm 
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Posts: 3980
Location: Lima, Peru and occasionally in the Washington DC area.
I pressed by the speed of the warranty work. Although I would have returned it... clean! :mrgreen:

_________________
Road bike: Cervelo R3, Campagnolo Chorus/Record mix...
Supercommuter: Jamis Renegade...pastatrails.blogspot.com
And you can call me Macktastik Honey Pete Kicks, thank you.


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PostPosted: Tue May 06, 2014 3:50 pm 
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Joined: Tue May 06, 2014 3:35 pm
Posts: 5
My rear mech has done exactly the same thing. The derailleur simply sheared off whilst going slowly on a gravel path. Must have been something to do with the vibrations going through the bike because it was not caught in the spokes, rather the fracture occurred whilst changing up. Luckily I pulled over and stopped before the mech went into the rear wheel. Given the thin nature of the material at this point, perhaps this is a design flaw. My mech ia a 2011 version also.


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PostPosted: Tue May 06, 2014 3:59 pm 
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Joined: Tue May 06, 2014 3:35 pm
Posts: 5
I can't post pictures as yet, but you can cut and paste these links:

https://farm8.staticflickr.com/7319/140 ... 9b67_z.jpg
https://farm8.staticflickr.com/7399/141 ... af7f_z.jpg
https://farm8.staticflickr.com/7366/141 ... 0411_z.jpg

And having ridden just over sixty miles, I was very lucky to only have to walk a mile further after the breakage.


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PostPosted: Tue May 06, 2014 5:48 pm 
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Joined: Mon Jul 18, 2011 7:25 am
Posts: 76
sam2msl wrote:
I can't post pictures as yet, but you can cut and paste these links:

https://farm8.staticflickr.com/7319/140 ... 9b67_z.jpg
https://farm8.staticflickr.com/7399/141 ... af7f_z.jpg
https://farm8.staticflickr.com/7366/141 ... 0411_z.jpg

And having ridden just over sixty miles, I was very lucky to only have to walk a mile further after the breakage.

This thread is almost a couple of years old now, but it might help somebody!


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PostPosted: Tue May 06, 2014 6:22 pm 
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Joined: Tue May 06, 2014 3:35 pm
Posts: 5
Quite understand. My pics are a day old having used the derailleur for three years without fault.
I just wanted to re-iterate that these mechs are prone to failure, not because of incident damage caused by crashes or spoke snagging, but because of an engineering anomaly. Perhaps the carbon-encased spring is vibrating/ expanding and causing the resin to crack over time?
Either way, this is not a time-specific problem.


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PostPosted: Tue May 06, 2014 9:46 pm 
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Joined: Tue Aug 02, 2011 9:20 pm
Posts: 1675
Location: New Zealand
Yeah I've seen a few SR RDs that have failed in the exact same place at my LBS

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2012 BMC SLR 6.02kg http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=110390


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PostPosted: Wed May 07, 2014 10:57 pm 
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Joined: Thu Mar 20, 2008 3:03 am
Posts: 620
Location: nyc
Was talking to my mech other day about upgrading to SR11, he said the lifespan is approx 2 years and that is the EXACT place he sad they have lots if problems, either the carbon is badly molded to begin w or it cracks. He think SR11 is a 2-year product, said Record better choice if you are looking for longer life. Also complained of the Ti parts inside (like screws) he said not nearly as durable as steele. This is a very high end place that sees a lot of expensive parts and grupose all day... too bad as I was salivating for Sr11 net year... hmm

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My wallet is the lightest thing on my bike.


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PostPosted: Wed May 07, 2014 11:00 pm 
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Joined: Thu Mar 20, 2008 3:03 am
Posts: 620
Location: nyc
PS FWIW Im still on 10sp Record and love it, his advice was lose the Campy fetish next time around...

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My wallet is the lightest thing on my bike.


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PostPosted: Wed May 07, 2014 11:51 pm 
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Joined: Tue May 23, 2006 9:39 pm
Posts: 669
yes, mine failed as well...slightly lower where it sheared off and dumped into my spokes. my Enve wheels held up, but the rear derailleur hanger tore off as well. lots of carnage.

who repairs them? i still have the broken pieces in a zip lock somewhere.

_________________
- AX Lightness Vial EVO D + DA9070 + Enve SES 2.2 Enve carbon hubs
- Parlee Altum + DA9070 + Enve 3.4 Enve carbon hubs
- Parlee ESX + DA9070 + Enve SES 6.7 CK hubs
- Independent Fabrication Ti FLW + Campy SR11 + Enve 3.4 CK hubs


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Posted: Wed May 07, 2014 11:51 pm 


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