Cracks to my seatstay. Is it safe to have repaired?
Moderator: robbosmans
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- Posts: 23
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Hi Everyone,
Rear mech ripped of the hanger on the weekend and cracked my seat stay in two places as a result. Have been quoted to repair but there is something inside me which is thinking "how safe is it" once repaired.
Heading to the mountains in a months time so wondering if I am worrying for nothing. The repairer advises it will be like new but still have those lingering doubts.
Rear mech ripped of the hanger on the weekend and cracked my seat stay in two places as a result. Have been quoted to repair but there is something inside me which is thinking "how safe is it" once repaired.
Heading to the mountains in a months time so wondering if I am worrying for nothing. The repairer advises it will be like new but still have those lingering doubts.
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- Posts: 23
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1 year on repaired portion of frame only (obviously)
** edited. Just checked again and he said 1 year.
** edited. Just checked again and he said 1 year.
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If you have Calfee do it, it will probably be stronger than it was initially (and look like new)
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- Posts: 23
- Joined: Thu Mar 26, 2015 4:08 am
Thanks Everyone
So happy I thought my Evo frame was lost forever. Cant wait to get it fixed.
I'm in Australia so cant get Calfee. But the shop I enquired said it would be as good as new.
So happy I thought my Evo frame was lost forever. Cant wait to get it fixed.
I'm in Australia so cant get Calfee. But the shop I enquired said it would be as good as new.
- wheelsONfire
- Posts: 6283
- Joined: Mon Jul 07, 2014 8:15 am
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I wonder how they repair that? I talked to a builder, they say a frame needs to be repaired from inside and out, not just patches covering from the outside.
It seems almost impossible to repair this from the inside!?
It seems almost impossible to repair this from the inside!?
Bikes:
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
It can be repaired, but it depends how its done as to how good it will be, some will just clean it up, take the paint/lacquer off then wrap in prepreg and cure. This is what I'd call the bare minimum. You'll (easily) be able to see the repair, even if its painted. It might even affect how the frame rides (but unlikely at that point on a seat stay)
Others will cut back/out the damaged section, grind out a section (exposing as many layer edges/faces as possible), possibly insert and glue some sort of internal support if the hole/damage is big enough, then build up with multiple patches and layers then wrap with a top layer, vac and cure. This would be more of a full on repair, it'll cost more and take longer, but after painting it'll be all but invisible, the effect on ride quality/frame stiffness and so on will be negligible.
What's your repair place planning to do?
(Have a look at some of the pictures of repairs from somewhere like HQ Fibre Products, it'll give you an idea)
Others will cut back/out the damaged section, grind out a section (exposing as many layer edges/faces as possible), possibly insert and glue some sort of internal support if the hole/damage is big enough, then build up with multiple patches and layers then wrap with a top layer, vac and cure. This would be more of a full on repair, it'll cost more and take longer, but after painting it'll be all but invisible, the effect on ride quality/frame stiffness and so on will be negligible.
What's your repair place planning to do?
(Have a look at some of the pictures of repairs from somewhere like HQ Fibre Products, it'll give you an idea)
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- Posts: 23
- Joined: Thu Mar 26, 2015 4:08 am
Not sure.. He just said it will be as strong as new and safe. That's all i care about. Plus it will look untouched and invisible.
On another note... Is my handlebar cracked?
On another note... Is my handlebar cracked?
wheelsONfire wrote:I wonder how they repair that? I talked to a builder, they say a frame needs to be repaired from inside and out, not just patches covering from the outside.
It seems almost impossible to repair this from the inside!?
If you can read Chinese or accept the terrible translation by Google, you can read this blog.
http://blog.sina.com.cn/s/blog_82129f210102vxat.html
I think the figures are enough to explain the process.
The author was graduated from Master Material Science. He did a lot of carbon wheel building in past 4 years and now start to repair carbon parts.
I'm getting much from that blog even with google translate. You cannot repair a chainstay from the inside-out. Whoever said that doesn't know what he's talking about. Plus, adding a carbon patch from the inside or the outside, what does it matter? It's still a patch bonded to the original carbon.
This guys site offers a lot of insight and information for DIYers:
http://theprojectjunkie.com/bicycles-bi ... epair.html
This guy did a seat stay:
http://www.instructables.com/id/Repairi ... cle-Frame/
The repair is a bit cruder than the project junkie guy though I imagine effective. Looks like he way over built it.
People often talk like carbon is mysterious. The repair techniques are the same as fiberglass. Boat builders have been doing it for decades and decades. Multi-million dollar carbon airplane wings are routinely repaired, not replaced.
This guys site offers a lot of insight and information for DIYers:
http://theprojectjunkie.com/bicycles-bi ... epair.html
This guy did a seat stay:
http://www.instructables.com/id/Repairi ... cle-Frame/
The repair is a bit cruder than the project junkie guy though I imagine effective. Looks like he way over built it.
People often talk like carbon is mysterious. The repair techniques are the same as fiberglass. Boat builders have been doing it for decades and decades. Multi-million dollar carbon airplane wings are routinely repaired, not replaced.
Visit starbike.com Online Retailer for HighEnd cycling components
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- wheelsONfire
- Posts: 6283
- Joined: Mon Jul 07, 2014 8:15 am
- Location: NorthEU
AJS914 wrote:I'm getting much from that blog even with google translate. You cannot repair a chainstay from the inside-out. Whoever said that doesn't know what he's talking about. Plus, adding a carbon patch from the inside or the outside, what does it matter? It's still a patch bonded to the original carbon.
This guys site offers a lot of insight and information for DIYers:
http://theprojectjunkie.com/bicycles-bi ... epair.html
This guy did a seat stay:
http://www.instructables.com/id/Repairi ... cle-Frame/
The repair is a bit cruder than the project junkie guy though I imagine effective. Looks like he way over built it.
People often talk like carbon is mysterious. The repair techniques are the same as fiberglass. Boat builders have been doing it for decades and decades. Multi-million dollar carbon airplane wings are routinely repaired, not replaced.
I have looked it up with Wolfgang from 3T, Ax Lightness, THM and Berk composites.
I understand a seatstay is not possible (it would seem anyway).
What i have seen, is that the area of damage is removed and a complete new build up was done.
Both from inside and out. Surface is flush clean both inside and out.
A buddy at work had a crack in the BB, the frame he had was a frame built in Asia, the company who sell this brand, told him it could not be repaired
so the frame was exchanged in his case. It pended on the fact, all their products are made in Asia and none was actually skilled enough to do a correct
job. This was due to safty reasons as they told him that if it was only repaired from outside, the crack could still grow from the inside and out.
I fully admit that personally i am not possessing such skills. I only forward what i have been told from the contacts i have had myself, only trying to learn
what is or could be done if and when cracks appear.
Bikes:
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.