Carbon fiber spokes + Alloy Rim = DISASTER(for MAVIC users)

Discuss light weight issues concerning road bikes & parts.
ohhyeok90
Posts: 48
Joined: Sun Nov 08, 2015 2:24 am

by ohhyeok90

Mavic R-SYS SLR
- today
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Mavic Ksyrium 125
- last month
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both cases happened during down hills on clean road.

checking spokes tension and hubs regularly.

folded by itself.

PinaF8
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Joined: Mon Jan 23, 2017 8:05 am

by PinaF8

Those are some scary pictures. I have those wheels for climbing but too pussy of a descender.
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itsacarr
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by itsacarr

Care to share more information? Bizarre indeed.

It does not look like there is any damage to the bikes themselves?
Last edited by itsacarr on Mon Nov 13, 2017 1:36 pm, edited 1 time in total.

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caballero
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by caballero

How are the riders ? Did they stay upright???

eric01
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by eric01

Second that. How is it possible for the wheels to completely fold like that on a descent and NOT wreck the frame? Doesn’t look like either one will complete a single rotation without hitting the fork/frame


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ohhyeok90
Posts: 48
Joined: Sun Nov 08, 2015 2:24 am

by ohhyeok90

itsacarr wrote:Care to share more information? Bizarre indeed.

It does not look like there is any damage to the bikes themselves?


Image

after 50m started down hills, front wheel sounds like 'ting~ ting~' and loose control and fall off.

BH frame also cracked(top tube)

rider also injured.

whosatthewheel
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by whosatthewheel

In the absence of an impact, I do not see how such failures can occur. I have little love for tracomp spokes and the likes, as I wrote in my blog a few years back

https://whosatthewheel.com/2015/01/08/w ... of-a-rant/

That said, wheels do not collapse and the photo of the rear clearly shows an impact as the rim cannot simply fold like that

ohhyeok90
Posts: 48
Joined: Sun Nov 08, 2015 2:24 am

by ohhyeok90

eric01 wrote:Second that. How is it possible for the wheels to completely fold like that on a descent and NOT wreck the frame? Doesn’t look like either one will complete a single rotation without hitting the fork/frame


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Image

I was there where second rider got accident. I didn't watching it but my friend did. he was right behind second rider.

down hill's slope is very high(above 14%), speed getting up so he tried to brake but rear wheel wobble left and right so he loose control and he flied front side and roll several times.

Thankfully it happend 200-300m after starting down hill.

so besides scratchs and bruises, he got broken left thumb.

How is possible? second rider and I wish to know that. but Amersports still don't respond about it.
Last edited by ohhyeok90 on Mon Nov 13, 2017 2:25 pm, edited 1 time in total.

ohhyeok90
Posts: 48
Joined: Sun Nov 08, 2015 2:24 am

by ohhyeok90

whosatthewheel wrote:In the absence of an impact, I do not see how such failures can occur. I have little love for tracomp spokes and the likes, as I wrote in my blog a few years back

https://whosatthewheel.com/2015/01/08/w ... of-a-rant/

That said, wheels do not collapse and the photo of the rear clearly shows an impact as the rim cannot simply fold like that


That's what most people says at first time they see these pictures.

"maybe he fall off first and a car stepped on rear wheel?"

But sadly besides myself, so many friends were there and witness that it folded by itself.

and there is more cases that mavic wheel which combo of carbon spokes and alloy rim folded like this.

ohhyeok90
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by ohhyeok90

-

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slake21
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by slake21

I'm glad I've sold my Ksyrium Pros

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kidrob
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Location: Belgium

by kidrob

I am actually surprised to see something like this, especially with Mavic products that in my knowledge have some of the of the highest standards and best reputation on the market. I see Mavic not as a very modern and state of the art, but innovative manufacturer with tradition, and once something is out its very decent and especially durable. Other than weight (depending on model and considering price-value ratio) I am not aware and experienced any issues with them whatsoever. Therefore seeing such a high-end product ending up with such fatal failure seems very extraordinary, especially breaking "against" the direction of the spokes while riding.
Last edited by kidrob on Mon Nov 13, 2017 4:43 pm, edited 3 times in total.

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kkibbler
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by kkibbler

...rider weight?

whosatthewheel
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by whosatthewheel

It is a bit surprising to see a folded wheel on an otherwise perfect bike... surely such catastrophic failure would lead to significant damage to the bike

wingguy
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by wingguy

ohhyeok90 wrote:How is possible? second rider and I wish to know that.

From your description it sounds like he got speed wobble, crashed, and that damaged the wheel.

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