Carbon ..... eeek?!

by veseunr   December 2, 2013  

I have a 'crack' in my non-driveside rear stay. The inside still looks fine and covered with glossy paint. The paint has cracked off the outside half and the carbon beneath is spring when I stuff my nail in .... no crack as such though.

No idea how it happened .... maybe just a bit pot-hole?

Can it be repaired? Who by? How much?

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10 user comments

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May be repairable, there are a number of places astound that do it. Try google?

Looks like damage from a stick caught in the spokes to me.

posted by drmatthewhardy [226 posts]
2nd December 2013 - 13:02

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Let us know how you get on if you do pursue a repair. I've never heard of Carbon frame repair offered in the UK (I'm sure someone probably does it), only seen it offered from some big specialist outfits like Calfree in the states.

posted by giobox [89 posts]
3rd December 2013 - 18:07

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posted by jasonm945 [17 posts]
3rd December 2013 - 20:30

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posted by drmatthewhardy [226 posts]
6th December 2013 - 22:05

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Carbon is more repairable than people give it credit for, as long as it's done right. It's basically a matter of taking some carbon layers, gluing them on and around the affected area, then baking it so that the new carbon "bandage" supports the original, cracked stuff.

Of course, in reality it's a little more complex than this. Your frame will gain a little weight and stiffness, and will lose some element of compliance or whatever the brand intended the affected area to do.

If it's painted, you'll want to get it resprayed (if looks are important to you). This can be more expensive than the repair itself.

NB: this is based on my experience with my Colnago CT-1, which needed a repair to the drive side chainstay. Calfee repaired it really easily, but paying for the respray to match the original art décor scheme was very spendy.

posted by Gordy748 [29 posts]
6th December 2013 - 23:58

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Carbon also has a heating process that cannot be exceeded or it prematurely ages the resin. "Patching an old wineskin with a new wineskin" analogy.

So you can either heat up the carbon patch properly and weaken the surrounding area or you can heat up the carbon patch improperly and get a weak repair.

It's still stronger than if you had not repaired it, but it won't be as strong as new.

posted by eschelar [21 posts]
7th December 2013 - 4:44

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Bin it and buy a proper metal bike.

My eyes prefer Celeste, my bum prefers titanium.

Jack Osbourne snr's picture

posted by Jack Osbourne snr [260 posts]
7th December 2013 - 10:38

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Jack Osbourne snr wrote:
Bin it and buy a proper metal bike.

Sure, because cracked aluminium frames have a great reputation for repairability... Thinking

posted by giobox [89 posts]
7th December 2013 - 18:21

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giobox wrote:
Jack Osbourne snr wrote:
Bin it and buy a proper metal bike.

Sure, because cracked aluminium frames have a great reputation for repairability... Thinking

That's new-fangled guff too. I was talking about PROPER metal.

Ignore the metallic reference in my signature. It's irrelevant here... Liar

My eyes prefer Celeste, my bum prefers titanium.

Jack Osbourne snr's picture

posted by Jack Osbourne snr [260 posts]
7th December 2013 - 20:24

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I'd go with fibre lyte as I recall an interview with Mike Burrows that said he uses them extensively iirc.

Or buy titanium. Kiss

posted by allez neg [409 posts]
7th December 2013 - 23:11

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