*********Subject name changed***** - Great photo of rider

Discuss light weight issues concerning road bikes & parts.
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Arky
Posts: 522
Joined: Sun Sep 23, 2007 5:06 am

by Arky

Clearly, BB30 and Zipp are at fault for this! :lol:

by Weenie


SlipperyT
Posts: 18
Joined: Tue Nov 29, 2011 2:29 pm

by SlipperyT

No need to get worked up over this. It's a regular warranty claim. Most manufacturers would be better served to be more generous in those less clear-cut cases. The guy is a CFO, so it's not like it makes a huge difference to him.

Frankly judging from the photos, there could be several possibilities. Unless each of us was a carbon particle resident in that right chain stay at the time it snapped, none of us will know for sure.

BobSantini
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Joined: Sun Jul 10, 2011 9:03 am

by BobSantini

Oh! I thought this thread was about changing subject names. :lol:
r o y g b i v

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breezerboy
Shop Owner
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Location: UK

by breezerboy

Murphs wrote:Photo sequence (don't ask for more, there aren't any):
Image

Well, this last shot shows the stays "sprung back" to a degree once torque loads were been removed, and also the r/mech still on it's hanger (so definately NOT a mech in the wheel).

Looks very much like QR/axle failure - wheel pulling out and to the right under high torque load - stays flexed beyond limit then failing. This would be apparent from tear fractures on the inside of both stays. If it's a frame failure at fault, there should almost certainly be compression/crush failure evident on the chainstay (seatstay could have failed as a result and still show the internal tear failure). Cracking on a chainstay prior to these photos would have to crush to fail (shortening the stay and locking the wheel) as the stays are under compression loads, but the frame would feel "soft" long before catastrophic failure. Obviously without detailed photos or examination this still cannot be proven and is just my theory from over 20 years as a composite structures developement engineer (before semi-retiring to shop ownership).

@Walkercycling - No offence meant, sorry if any was taken, and I certainly didn't call you a liar (although re-reading my post I can see how you may feel it was implied - unintentionally I may add).

petal666
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Location: Brisbane, Oz
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by petal666

breezerboy wrote:I didn't include the posters names as it wouldn't mean anything being from another forum.
I have the same username on both forums :lol:

CSquare43
Posts: 30
Joined: Tue Jan 15, 2008 6:29 pm

by CSquare43

From the looks of those pics, it appears to me that the QR skewer came out of the wheel...and that could have caused the problem.

The dropout that we can see doesn't seem to have any damage, and if the wheel was clamped on both sides by the skewer, breaking a chainstay or seatstay would not likely cause the wheel to come out of the frame like that...unless the QR broke or came out in the failure (which is unlikely IMO).

My guess is that this is user (or mechanic) error and that Specialized will likely cover it under warranty regardless...

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kbbpll
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Joined: Wed Oct 20, 2010 5:56 am

by kbbpll

Awesome photos. Especially the second one where he gets both wheels parallel and stays up, and the guy on his right is going "dude, you broke your bike".

I'm totally perplexed though - if both seat and chainstays snapped, how is not eating bitumen? Without anything else to go on, I'd have to give credit to Specialized for making a frame that still supports a rider on half a rear end with both stays busted.

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HammerTime2
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by HammerTime2

breezerboy wrote:
Just so you guys know, the rider in the picture had a mechanical issue earlyer befor this happened ... not sure if he had the wheel swaped or just looked at but from what i have herd the wheel fell out of the dropouts or pulled out and thats when the frame broke, probably due to the quick realeas not being tight enough

I was behind him on the first lap. Whenever he got on the power the wheel would jump to the drive side for a second and then back to its normal spot again. I thought he had a buckle in his Zipp but when he pedalled easy or coasted it was dead straight.I also noticed his gears jumped around at one stage.

I moved up and told him I thought his wheel axle was broken, as it certainly wasn't he QR. After that I stayed ahead of him as there was something seriously wrong with his bike and I didn't want to be behind it.

Obviously issues were there before the failure, but he kept riding anyway. OK, so it was a race, but you certainly can't say the rider was blameless in the severity of the failure.

Did the mechanical cause the failure, or was it a symptom? Who knows, but without more details or further inspection you cannot say this is a "frame failure", just as I cannot say it was rider error/poor build.
This was apparently a JRAWIPWTB*

* Just Riding Along While Ignoring Problems With The Bike

Andrew69
Posts: 142
Joined: Thu Feb 19, 2009 10:52 am

by Andrew69

If anything, that photo sequence make me want to BUY a SL4.

Cant be that poorly designed/built if you can get the rear wheel that far out of shape and not have the whole rear end shear off :unbelievable:

BobSantini
Posts: 292
Joined: Sun Jul 10, 2011 9:03 am

by BobSantini

I'd like to know if it was a qr failure. It never occurred to me that you could bend the stays like that with chain tension, but of course you can.
I might just upgrade the qr in my rear wheel.
r o y g b i v

walkercycling
Posts: 46
Joined: Sat Feb 19, 2011 5:42 am

by walkercycling

Specialized have replaced the frame.

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53x12
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Location: On the bike

by 53x12

^ Good for them. Figured they would do that, as it as that is not a battle worth fighting.
"Marginal gains are the only gains when all that's left to gain is in the margins."

aeroslave
Posts: 258
Joined: Tue Oct 14, 2008 12:56 am

by aeroslave

walkercycling wrote:Specialized have replaced the frame.




2 thumbs and 2 toes up.....someone in Merida's factory in taiwan was smoking pot when that batch was made. :lol:
"Light bike? Its still about the engine!".

Zitter
Posts: 563
Joined: Fri Jun 03, 2011 9:12 pm
Location: Orange County

by Zitter

Same thing happened to me on a steel frame. Qr failed during a sprint and bent out the seat and chain stays exactly like that. Luckily I stayed up and skidded to a halt (shredded right through the tire). Mechanic was able to bend it back into place but I didn't feel comfortable riding it after that.

Image

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kbbpll
Posts: 408
Joined: Wed Oct 20, 2010 5:56 am

by kbbpll

^ Not sure but did this ever happen with old-school horizontal dropouts? Presuming of course the QR head doesn't come off, doesn't seem like you'd ever see one side of the wheel pop completely off with the old dropouts. I could be wrong...

by Weenie


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