Cracked seat tube?

Fresh
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Cracked seat tube?

Postby Fresh » Mon Nov 20, 2017 10:42 pm

Noticed this tonight while inspecting my Cervelo S3...is that a hairline crack in my seat tube? I have barely ridden the thing in the time I have owned it...

Image

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Duck!
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Re: Cracked seat tube?

Postby Duck! » Tue Nov 21, 2017 12:35 am

No, looks to me more like a join between two pieces of carbon mat in the layup.
I had a thought, but it got run over as it crossed my mind.

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Comedian
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Re: Cracked seat tube?

Postby Comedian » Tue Nov 21, 2017 7:30 am

I'd go for join too. In areas that aren't painted you'd expect to see joins.

In the meantime - have a close look at it when you wash your bike to keep an eye on it, and when it's next in for servicing ask the Cervelo agent to check it.

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Nate
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Re: Cracked seat tube?

Postby Nate » Tue Nov 21, 2017 1:16 pm

yeah looks like join in carbon.
For a crack its just waaaay too straight.

Look at it in different light angles, does it come/go?
if you use a magnifying glass you may be able to see the fibres going around/in the crack.
How does it compare to other areas of the bike? similar patterns?

but yep - check it out at the shop.

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AUbicycles
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Re: Cracked seat tube?

Postby AUbicycles » Thu Nov 23, 2017 4:01 am

Can’t see well on the mobile phone so a second opinion is an external scratch (not crack) from a grain of sand (etc) that has scratched thr surface while the seatpost was inserted. It is perfectly centred so the other posters are probably closer.

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open roader
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Re: Cracked seat tube?

Postby open roader » Thu Nov 23, 2017 1:51 pm

I vote for carbon layup join line, my 2010 TCR Adv. had something similar running liner fair down the middle of the TT.
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Fresh
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Re: Cracked seat tube?

Postby Fresh » Thu Nov 23, 2017 5:42 pm

Thanks for all the replies. The mechanic where I bought it agrees with all of you, and pretty much assured me when we noticed the join extend under the top tube with closer examination.

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Duck!
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Re: Cracked seat tube?

Postby Duck! » Thu Nov 23, 2017 6:46 pm

Carbon frames are laid with literally several hundred individual pieces of carbon mat. The outer layer will generally be fairly large pieces wrapped around the length of the main tubes, especially if the frame is to be left clearcoated with a visible carbon finish, but there will always be visible edges between the pieces of mat.
I had a thought, but it got run over as it crossed my mind.

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