Not one, but TWO] snapped front derailleurs--WTF?
#1
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Not one, but TWO] snapped front derailleurs--WTF?
Jayzus, what the aitch is going on here?
The Centaur arm snapped last year in mid-shift. Just today the Chorus arm cracked as I was tightening the cable, then broke off completely. I'm peeved.
The Centaur arm snapped last year in mid-shift. Just today the Chorus arm cracked as I was tightening the cable, then broke off completely. I'm peeved.
Last edited by rousseau; 08-17-13 at 04:17 PM. Reason: Wording
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Weak ass campy ****e
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#7
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Originally Posted by NWS Apline
Torque wrench broken?
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You really need to review what you are doing before blaming the part.
My Campy Chorus band on front d is 14 years old and has worked flawlessly since I first installed it in '99.
How did they break? What were you doing before/when they broke? Were they new or used? Were they damaged before you installed them?
Possibly trying to shift under a very heavy load may possibly break the top of the arm off but I've never seen it happen before in 20 years of working in a lbs.
The Chorus d looks quite pitted at the band area and the break looks like a lot of torque was placed on the fixing bolt/area that secures the cable. Normally, and I've seen this a few times, the threads on the d are stripped as they are aluminum and the bolt is steel...the normal fix is to use a nut and bolt...works quite well in fact but adjusting the cable is a bit more difficult.
Give us a better description of what happened if you aren't just griping.
It is certainly not just because it is Campy...I still see Nouvo Record stuff, not much, on the road.
Without more info I'd say user error...
My Campy Chorus band on front d is 14 years old and has worked flawlessly since I first installed it in '99.
How did they break? What were you doing before/when they broke? Were they new or used? Were they damaged before you installed them?
Possibly trying to shift under a very heavy load may possibly break the top of the arm off but I've never seen it happen before in 20 years of working in a lbs.
The Chorus d looks quite pitted at the band area and the break looks like a lot of torque was placed on the fixing bolt/area that secures the cable. Normally, and I've seen this a few times, the threads on the d are stripped as they are aluminum and the bolt is steel...the normal fix is to use a nut and bolt...works quite well in fact but adjusting the cable is a bit more difficult.
Give us a better description of what happened if you aren't just griping.
It is certainly not just because it is Campy...I still see Nouvo Record stuff, not much, on the road.
Without more info I'd say user error...
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Campagnolo used this same outside arm design on all 8, 9, and 10spd front derailleurs and these are the only broken ones I have ever seen. I don't want to accuse you of anything, but I would recommend using a torque wrench (campy has a torque spec for every bolt) and seeing if things change. I've owned and wrenched a lot of these with no issue.
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First (and second) time I've ever seen that happen, and I've seen a LOT of broken parts.
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I would think over-torquing would result in stripped threads, or snapping the screw head off, not breaking the arm.
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Ive had 2 105 triple front D's break when the catch for the spring broke. These are the only fd breaks I've ever had. Sometimes bad luck does strike twice.
I'd call this unlucky and carry on. Talking about precision torque and all that is going a bit far, just tighten the bolt until you meet resistance.
I'd call this unlucky and carry on. Talking about precision torque and all that is going a bit far, just tighten the bolt until you meet resistance.
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whatever happened, it seems to be unique to the OP and one failure was confirmed in the stand so I'm skeptical it is an issue with the bike itself.
This particular failure seems fairly common. I just replaced a sora for a coworker that had the same issue. Ive seen a number of shimanos fail this way.
Last edited by thirdgenbird; 08-18-13 at 09:21 AM.
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It's Campy's way of telling you to upgrade to 11 speed. Then you can get this kind of failure:
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I wouldn't think it would cause the centaur failure, but I could see it cracking like the chorus. After all, it did happen when it was tightened. The bolt is steel and the derailleur has a steel insert. both should easily hold much more than 5Nm. Maybe the steel insert is breaking free from the alloy arm. maybe the centaur arm cracked when tightening and then shift pressure caused the crack to go down the arm. If it did, there would be a crack coming off the bolt hole.
whatever happened, it seems to be unique to the OP and one failure was confirmed in the stand so I'm skeptical it is an issue with the bike itself.
This particular failure seems fairly common. I just replaced a sora for a coworker that had the same issue. Ive seen a number of shimanos fail this way.
whatever happened, it seems to be unique to the OP and one failure was confirmed in the stand so I'm skeptical it is an issue with the bike itself.
This particular failure seems fairly common. I just replaced a sora for a coworker that had the same issue. Ive seen a number of shimanos fail this way.
On the Shimano, yeah, it was just a small catch that failed both times; part of the problem might have been that I was keeping the bike in an outdoor car port near the sea for 2 years, but I can easily see how it would happen again and again.
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