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Fantastic frame price, BUT
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Hey all.

I have a line on a great TT frame in great condition for a fantastic price, but one issue:
the aluminum seatpost screw housing has come free from the frame. Apparently the frame was sent back to the manufacturer which used epoxy or some similar material to try and rectify this, , but not long after it's return the housing came free.

What are the odds of a DIY fix job working here? Perhaps a better cleaning of the inside was needed before adhesive was applied? ? A different adhesive needed? If the housing can't be stuck in place, maybe the seatpost itself could be be epoxied in place? The price on this is fantastic, wondering if what the knowledgeable people here think, or if people have dealt with similar situations binding carbon to aluminium.

Peace.


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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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If you're ok with the potential of the money being wasted, definitely go for it. Throughly clean and degrease with acetone, sand every surface you can, and clean/degrease again. Then bond. There are plenty of adhesives that will likely work just fine. Locktite e120hp is an epoxy my lab uses for tabbing specimens and i bet it would work for this.
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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Nothing I say should be tried if you value your life and all sorts of disclaimers, etc........

1. Question, is the round alum piece perfectly round or is there an inset? Without an inset, once anything hardens there's not any "hump" to resist it pulling out.
Suggestion: Pull the alum piece out, file down some part so it is oblong, and epoxy again.

2. If that piece it is in is just for the clamping you could try a really small and super nice/sharp drill bit and drill through the frame part of the clamp AND the alum spacer, epoxy it, and drive a small pin in the hole you made to keep it pulling out. Then maybe add a piece of carbon repair over the tiny hole you drilled that's like 1" square to reinforce it.

More of a fan of #2.
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Re: Fantastic frame price, BUT [imswimmer328] [ In reply to ]
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imswimmer328 wrote:
If you're ok with the potential of the money being wasted, definitely go for it. Throughly clean and degrease with acetone, sand every surface you can, and clean/degrease again. Then bond. There are plenty of adhesives that will likely work just fine. Locktite e120hp is an epoxy my lab uses for tabbing specimens and i bet it would work for this.

Yeah but makes me wonder why the manufacturer didn’t get this to work.
If there’s a backup option I think I’ll pull the trigger. Ex: directly seal the seatpost to frame where it slots in. Is carbon to carbon easier than carbon to aluminum?
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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I did this to my bike. Not the same brand but similar clamp design. Been riding it for 6 years without problems.
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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If you coat the seatpost with adhesive and insert it, it'll never move again provided you prepped the surfaces right. Better be happy with your fit before you do that though.

I suspect the manufacturer couldn't get it to work because there's no clearance between the insert and the frame. If you can sand down the insert so there's room for the adhesive you shouldn't have a problem. Probably would be ok if you gently sanded a small amount of material out of the frame too. You don't need much room. If you do this though, make sure you use the clamp so the inserts cure straight.

Don't do the pin method mentioned by another poster.
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Re: Fantastic frame price, BUT [NordicSkier] [ In reply to ]
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NordicSkier wrote:
I did this to my bike. Not the same brand but similar clamp design. Been riding it for 6 years without problems.

That’s what I like to hear!
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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specialized did a fix in factory to my shiv. one year later it popped and now i have a new frame with the updated bolts that are j bolts i think. I think alot of people are putting stuff below the seat post as a stop
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Re: Fantastic frame price, BUT [Cookiebuilder] [ In reply to ]
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Cookiebuilder wrote:
specialized did a fix in factory to my shiv. one year later it popped and now i have a new frame with the updated bolts that are j bolts i think. I think alot of people are putting stuff below the seat post as a stop

That’s genius. This frame is a shiv too but sounds like you already discerned that.
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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arca_tern wrote:
Cookiebuilder wrote:
specialized did a fix in factory to my shiv. one year later it popped and now i have a new frame with the updated bolts that are j bolts i think. I think alot of people are putting stuff below the seat post as a stop

That’s genius. This frame is a shiv too but sounds like you already discerned that.

Not sure if Dustin is available at “we are one wheels” he’s in the top40 wood work building.

Maurice

http://www.multisportsolutions.com
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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I'd probably instead just drill a couple of through holes into the seat tube including the seat post and press in some metal dowel pins (try to hand work the pins to be flush to the seat tube shape). In case something happens you can pound the pins out and replace the seat post pretty easily. Or something using pins as that is the first thing that popped into my mind but I'd most definitely give it some more thought before I drilled/modified anything.

Give a lowball offer under what the current asking price is and see what happens. At least some amount you are comfortable taking a bath on. You never know since whoever is selling it has no use for it as is.
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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Just a thought, but you could try contacting someone who makes custom golf clubs near you. They routinely epoxy carbon fiber shafts into steel or titanium sleeves, and they have to withstand a ton of impacts. It's the reverse of what you've got. A friend makes clubs, and I remember him telling me that in addition to prep and choice of epoxy that temperature and humidity need to be within a certain range for a good joint.

Brian

In a way, I can't help but feel responsible, I always knew that you were insane
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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Could you replace with something from this list:
https://www.mcmaster.com/threaded-inserts
?
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Re: Fantastic frame price, BUT [MattyK] [ In reply to ]
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Some awesome suggestions here!
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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Get another seatpost and cut to height needed. As I remember post can only travel into frame a limited amount. If you are not original owner, SBC will not honor warranty.
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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arca_tern wrote:
Hey all.


I have a line on a great TT frame in great condition for a fantastic price, but one issue:
the aluminum seatpost screw housing has come free from the frame. Apparently the frame was sent back to the manufacturer which used epoxy or some similar material to try and rectify this, , but not long after it's return the housing came free.

What are the odds of a DIY fix job working here? Perhaps a better cleaning of the inside was needed before adhesive was applied? ? A different adhesive needed? If the housing can't be stuck in place, maybe the seatpost itself could be be epoxied in place? The price on this is fantastic, wondering if what the knowledgeable people here think, or if people have dealt with similar situations binding carbon to aluminium.

Peace.



I don't know if you have found a solution or not but I found this guy on Instagram last night and instantly thought of this post. It looks like he is a carbon fiber repair engineer. He posted about this exact same issue. Reach out to him, i'm sure he can offer some advice.

Link to user:
https://www.instagram.com/luescher_teknik/

Link to post about this issue:
https://www.instagram.com/...n-by=luescher_teknik

I'm really surprised he doesn't have more followers his posts are fascinating!

Cheers

DP
Buy - sell - trade eBay Store Surveys: Favorite disance in Triathlon
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Re: Fantastic frame price, BUT [D_PRC] [ In reply to ]
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Someone else bought the frame before I could. :(
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Re: Fantastic frame price, BUT [arca_tern] [ In reply to ]
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SHIT. Sorry to hear.
Check that dude's Instagram out anyways. He claims to have tested the "twin blade fork/TT handlebar" back in 2012... The one found on the new Specialized Shiv.

DP
Buy - sell - trade eBay Store Surveys: Favorite disance in Triathlon
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Re: Fantastic frame price, BUT [D_PRC] [ In reply to ]
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Luescher seems to have a pretty decent following with the tech crowd. He's a former airplane engineer (lots of work on carbon wings) turned to bicycle carbon repair specialist. He's a little quirky, but has more knowledge on the subject, and ability to analyze carbon, than the rest of us.
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