Carbon swingarm vs alloy

Spoonman
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Carbon swingarm vs alloy

Postby Spoonman » Tue Jul 17, 2018 3:10 pm

I recently purchased a 2017 Scott Spark Premium 700. I had the bike for about 3 weeks when somehow while out on a big ride managed to get my foot stuck (whilst clipped in) in the carbon swing arm. Heard a crack and stopped to inspect. Broken swingarm.

Was about 50 kms from home which wasn’t ideal but gave me time to ponder why this had happened. Couple of reasons:

-Boost hubs (frame really wide coming off the hubs and easily clipped especially if your riding style is slightly duck footed)

-Frame Design (noticed on my Kona hardtail that the rear triangle actually had some curves on the diagonal which are in exactly the position your foot could get caught. Apparently they are also to allow some flex in the frame)

After this unfortunate incident on a high end bike (RRP $9199) I was told by LBS would not be covered under warranty and that it would be $3000 to repair or $1700 to replace. Large amount of money to spend so soon after spending a large amount of money.

Would like to know if anybody else has had a similar issue with a carbon swingarm and whether I might be better off with an alloy swingarm? Or maybe alloy mainframe as well because I have no faith in carbon anymore. :(

cooperplace
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Re: Carbon swingarm vs alloy

Postby cooperplace » Tue Jul 17, 2018 5:24 pm

I think everyone I know with a carbon frame has had a crack, they're all on their 2nd/3rd/4th frames. I share your lack of faith.
Please be nice to me, I'm not very bright.

eeksll
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Re: Carbon swingarm vs alloy

Postby eeksll » Tue Jul 17, 2018 10:01 pm

that doesn't sound right to me. I'd be googling like crazy and definitely be seeking second/third/fourth opinions.

mikgit
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Re: Carbon swingarm vs alloy

Postby mikgit » Tue Jul 17, 2018 10:06 pm

My mate had an Aluminium Specialised, he went through...I don't even know how many chainstay/swing arms on that, I think it was 4. he also had 2 replacement Cannondale aluminium HT frames.
Another friend broke an aluminium GT Zaskar...and apparently they are unbreakable
My aluminium FS frame was so full of cracks there were more cracks than frame...

On the other hand another mate has a carbon Trek HT, bought it 2nd hand in like 2000, rode/raced it hard for years and it's still going strong, similar for his carbon Scott FS bike

Carbon, aluminium, doesn't matter you can still break them in the stupidest ways
Look 675 Pro Team, Cervelo R3, GT Xizang, GT Zaskar, Scott Spark 710, Yeti ARC, DiamondBack Apex

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Duck!
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Re: Carbon swingarm vs alloy

Postby Duck! » Tue Jul 17, 2018 10:20 pm

That repair price sounds excessive. While it's true that carbon repairs are not particularly cheap, due to the high manual work component, unless it's a major break a repair should compare favourably against replacement. Additionally, I'm tipping the damage is moderate at worst.... The forces necessary to cause a major fracture from sticking your foot in it would cause a similar degree of damage to said foot.

Contact Paint My Bike, Luescher Teknik or a similar carbon repair firm for a proper estimate of repair cost.
I had a thought, but it got run over as it crossed my mind.

Spoonman
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Re: Carbon swingarm vs alloy

Postby Spoonman » Wed Jul 18, 2018 8:57 am

Duck! wrote:That repair price sounds excessive. While it's true that carbon repairs are not particularly cheap, due to the high manual work component, unless it's a major break a repair should compare favourably against replacement. Additionally, I'm tipping the damage is moderate at worst.... The forces necessary to cause a major fracture from sticking your foot in it would cause a similar degree of damage to said foot.

Contact Paint My Bike, Luescher Teknik or a similar carbon repair firm for a proper estimate of repair cost.


Thanks Duck! I have started chasing this up off my own bat. Scott have come back and said they would supply new swingarm at a “goodwill” price of $850. (Inclusive of freight charges) Paint my bike came back with a quote of $795 for the repair. Six of one...

I was hoping for some goodwill from the bike shop where the bike was purchased. Seeing that this happened 3 weeks after purchasing the bike. Is it unreasonable to expect them not to charge for labour involved removing and refitting the swing arm?

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Duck!
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Re: Carbon swingarm vs alloy

Postby Duck! » Wed Jul 18, 2018 9:09 am

Given crash damage is not covered by warranty, it is a little unreasonable to expect the shop to supply free labour.
I had a thought, but it got run over as it crossed my mind.

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MichaelB
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Re: Carbon swingarm vs alloy

Postby MichaelB » Wed Jul 18, 2018 3:24 pm

Duck! wrote:Given crash damage is not covered by warranty, it is a little unreasonable to expect the shop to supply free labour.


Agree with that.

And I'd go with a new part for $50 extra and have the other one as a spare that can be repaired. Quicker turn around too probably.

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ValleyForge
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Re: Carbon swingarm vs alloy

Postby ValleyForge » Wed Jul 18, 2018 7:59 pm

As an aside, we have four duallies in the house, two with alloy rears and two with carbon. 1 x Cube, 2 x Focus and 1 x LaPierre.

Certainly no issues with cracking - some have taken a pounding. And some are poodled about.
Ha ha ha! Cookies on dowels.

Spoonman
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Re: Carbon swingarm vs alloy

Postby Spoonman » Tue Aug 14, 2018 10:46 pm

I have finally received the replacement swingarm! It only cost $850! Was fantastic for five days and 2 rides. I was Washing the bike when I noticed a crack on the chai stay just under the spot my foot cracked the other one. Not another one!

I am not at all impressed. By definition this bike is not fit for purpose. I bought the bike to compete in a multiple day stage race at the end of the year in the southern alps of NZ. It’s clearly not going to be able to do that. It’s not like I’m doing backflips either.

Is this the bit where I demand a full refund?!

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