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#1
04-04-2021, 11:09 AM
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Carbon Seat tube crack question
So I traded my want into this frame and effectively have almost no money in it. But I found this crack at the seat tube top and it seems to be a "somewhat" common issues on the 2016-ish Domane. Likely due to a very slightly over-sized inner dimension, OR the original post being slightly undersized.
I wouldn't have any problem riding it like this. But I'm going to paint the frame regardless. Even if it ends up as wall art. My actual question is, would it be crazy to drill a hole at the tip of the crack and lengthen the slot? Or should I use a carbon repair kit? Or just clamp it and YOLO?   Sent from my iPhone using Tapatalk Pro 
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#2
04-04-2021, 11:23 AM
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That crack appears to continue down and past the logo. I always thought those cracked due to stress and too much flex but who knows.
You try and warranty it?
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#3
04-04-2021, 11:28 AM
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Maybe it is from flex... I dunno... but my thought is that it couldn't fail 'catastrophically' since the seat post is clamped to the tube and at worst the crack might lengthen over time. It could end up being a monitoring situation for me. This would be road bike #4 (not including the CX bike), so it wouldn't see daily use or even close.
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#4
04-04-2021, 11:44 AM
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With a seat post in there I would not worry too much. Just monitor it. If you are sure of the location end of the crack, drilling a hole to prevent propagation is a good idea.
__________________
Cheers...Daryl Life is too important to be taken seriously
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#5
04-04-2021, 12:19 PM
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#6
04-04-2021, 12:24 PM
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If it were me, first I'd start sanding/filing away to get a better sense of how far that crack goes, then I'd probably patch it up with some carbon fiber, then I'd ride with an extra long seatpost.
__________________
Instagram - DannAdore Bicycles
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#8
04-04-2021, 12:48 PM
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Crack
I have a crack almost identical to this on a Focus that I’ve ridden for years. I keep monitoring it as folks have noted with the anticipation of repairing or drilling to stop the propagation but it never gets worse so I’ve just left it. I might have up to 10k miles on it like this. Of course YMMV but that’s what I’ve done.
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#9
04-04-2021, 01:00 PM
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Shim it to a 25.4 post and spread the love around to more surface area, just watch it, but I'd ride it etc. Put the seam in the shim 180 degrees to the ST slot.
Maybe a CG-R post take some of the leverage down a notch of the big hits??
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#10
04-04-2021, 01:33 PM
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__________________
2003 CSi / Legend Ti / Seven 622 SLX
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#11
04-04-2021, 03:49 PM
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Got get this fixed...
That will travel and can eventually work it's way into a pretty significant failure. It's not a hard fix, but you dont want to let that start walking around that tube as it does it's job....
__________________
charles@pezcyclingnews.com
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#12
04-05-2021, 02:43 AM
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Yeah I recommend fixing this early on.
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#13
04-05-2021, 08:02 AM
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Quote:
__________________
Chisholm's Custom Wheels Qui Si Parla Campagnolo
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#14
04-05-2021, 08:29 AM
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If you are going to go to the effort and expense of a repaint, get it repaired while you are at it. One and done, and then you don't have to worry about ruining the nice new paint when it splits for good some time down the road.
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#15
04-05-2021, 08:40 AM
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Repair. Repaint. Repost on PL. Ok I can do that.
Just measured and the extra 350mm post I have would end up with ~150mm inserted. I also ordered a 27.2/31.8 "double?" Seat post clamp so I can clamp the post too. Shouldn't have any need to feel like over tightening the tube with carbon crushing force. Sent from my iPhone using Tapatalk Pro
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