if its zipp its fragile

Discuss light weight issues concerning road bikes & parts.
soulrider
Posts: 9
Joined: Wed Jul 12, 2006 7:41 am

by soulrider

I was out for my first raodride in awhile and as I was riding away from a stop sign I heard a mysterious crunch and my left hand became unweighted. I looked down to find my beloved ZIpp B2 carbon bars fracture under my own power. This event was even more surprising because the bike has never even fallen over let alone been involved in a crash.

by Weenie


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Mottsauce
Posts: 529
Joined: Tue Oct 04, 2005 8:37 am
Location: Cincinnati, OH

by Mottsauce

A couple of questions to appease my curiosity:

1) How much do you weigh?

2)Where did the bars fracture...was it at a clamping postion (shifter/stem)?

soulrider
Posts: 9
Joined: Wed Jul 12, 2006 7:41 am

by soulrider

I weight about 155 pounds and I am by no means a power house sprinter. The fracture is to the left of the clamp. Pictures are coming but they are to big and I don't know how to compress them.

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Mottsauce
Posts: 529
Joined: Tue Oct 04, 2005 8:37 am
Location: Cincinnati, OH

by Mottsauce

soulrider wrote:Pictures are coming but they are to big and I don't know how to compress them.


Just upload them to a site like www.tinypic.com, post the links, and somebody will compress them for you.

That's certainly a low weight for such a failure...looking forward to the pics.

soulrider
Posts: 9
Joined: Wed Jul 12, 2006 7:41 am

by soulrider

try this http://i13.tinypic.com/6bvy3rk.jpg.

I apologize for my apparent lack of computer knowledge.

[img tags removed by Frankie. pic was to large]

Dubbayoo
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by Dubbayoo

What country/state did this happen in?

mzagorski
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Location: A Scotsman on rock in the pacific
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by mzagorski

Wow... That's VERY surprising results to see from "just-riding-along". I've used their lightest superlight SL bar for 1.5 seasons now. It's been raced on, trained on, thrashed around a lot... a 164g bar! Feels crazy stuff under my 150lb weight. Did you hit any big potholes at some point before the major failure of the bar?... That would possibly have weakened the bar and over time a hairline crack for bigger.. then voila... eventually it goes pop.

Simoni
Posts: 9
Joined: Sat Oct 07, 2006 10:06 am
Location: Chasing down a break

by Simoni

I'm sure you have a torque wrench and followed the allowances when tightening the stem around the bars.
Since I know several people that work at Zipp, in Indianapolis, I sent them a link to this thread. So they can see it.

Simoni
Posts: 9
Joined: Sat Oct 07, 2006 10:06 am
Location: Chasing down a break

by Simoni

mzagorski wrote:Wow... That's VERY surprising results to see from "just-riding-along". I've used their lightest superlight SL bar for 1.5 seasons now. It's been raced on, trained on, thrashed around a lot... a 164g bar! Feels crazy stuff under my 150lb weight. Did you hit any big potholes at some point before the major failure of the bar?... That would possibly have weakened the bar and over time a hairline crack for bigger.. then voila... eventually it goes pop.


Or used a standard allen wrench instead of following the specific torque levels using a torque wrench when putting the bars on the bike.

In a bike shop "just riding alongs" are the highlight of a wrench's day.

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bobbyOCR
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Joined: Sun Sep 03, 2006 1:55 pm
Location: Western Australia

by bobbyOCR

Something is irritating me about this thread. I get that your Zipp bars cracked and that sucks, but the thread title is a pretty negative generalisation against all Zipp products (though they do have a track record)
Cyclist turned music producer

Visiting South West Australia? Visit Crank n' Cycles!

frd
Posts: 1452
Joined: Mon May 08, 2006 8:45 pm

by frd

Simoni wrote:Or used a standard allen wrench instead of following the specific torque levels using a torque wrench when putting the bars on the bike.

I would be surprised If a bar cracked 4cms away from the clamp (see picture) as a result of overtightening the stem.

addicted
Posts: 1032
Joined: Tue Mar 20, 2007 5:56 pm

by addicted

I was thinking the same thing, doesn't look like a failure caused by overtightening, based on the position of the break.
There have been plenty of threads about broken Zipp wheels.....Does this mean Zipp products are bad? Well, I wouldn't go that far. I'd say when you ride carbon bars, you are taking your chances regardless of brand..
.02

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JKolmo
Posts: 582
Joined: Sat Feb 10, 2007 2:00 pm

by JKolmo

I get that your Zipp bars cracked and that sucks, but the thread title is a pretty negative generalisation against all Zipp products (though they do have a track record)


Make that a crack record :wink:

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CharlesM
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Joined: Tue Sep 26, 2006 12:37 am
Location: Phoenix Arizona

by CharlesM

bobbyOCR wrote:Something is irritating me about this thread. I get that your Zipp bars cracked and that sucks, but the thread title is a pretty negative generalisation against all Zipp products (though they do have a track record)



Honestly, there seems to be more aof a track record of forum bashing...

In fact, this is the first "Just riding along" I've seen with their bars ever, and we've seen the same couple of wheel "issues" just rehashed over and over again rather than lots of new problems.

mzagorski wrote:Wow... That's VERY surprising results to see from "just-riding-along". I've used their lightest superlight SL bar for 1.5 seasons now. It's been raced on, trained on, thrashed around a lot... a 164g bar! Feels crazy stuff under my 150lb weight. Did you hit any big potholes at some point before the major failure of the bar?... That would possibly have weakened the bar and over time a hairline crack for bigger.. then voila... eventually it goes pop.



Even if he did hit a pothole, I would doubt this would happen... I would guess the bikes either been crashed or the bars clamped with enough force to create a stress fracture

And since they are built up more around the clamping area, they could very well crack at the edge of the enforced area rather than at the stem...

{edit} A quick look at Higher Res also shows a crack running from the area at the face plate where the stress would have come from as well... Maybe this was from the bar spontaniously exploding, or maybe it simply shows where the problem started...

Image






Honestly, as this stands, this is a single bar problem and with all that are out there, this is a Genuinely BS thread title...

[edit by Frankie]
Last edited by CharlesM on Thu Jul 05, 2007 10:04 pm, edited 1 time in total.

frd
Posts: 1452
Joined: Mon May 08, 2006 8:45 pm

by frd

sharp eye Pez!
I see no zipp bashing in this thread (except the now infamous title). OP reported a problem, other guys tried to help understanding the cause.
Peace!

by Weenie


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