saddle carbon rail cracked repair (diy)

Discuss light weight issues concerning road bikes & parts.
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josemari220
Posts: 9
Joined: Sat Nov 05, 2011 9:52 pm

by josemari220

In first times I thought that carbon was unrepairable, but after a fistfull of success woks, now I think it is quite easy thing.
Now is time to repair a carbon rail of an specialized, romin saddle.
Here you are some pics of the process
Please, do not throw to trash your expensive carbon parts. Look for help to somebody with skills to do theese repairs. They are reliables and cheap.
sillin romin rail roto preparacion.JPG
sillin romin rail roto primera capa.JPG
sillin romin rail roto tercera capa.JPG
sillin romin rail roto terminado detalle.JPG

by Weenie


KarlC
Posts: 729
Joined: Fri Dec 05, 2014 2:08 am
Location: San Diego Ca USA

by KarlC

End result look pretty good, got link to where you bought the materials ?

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wheelbuilder
Posts: 506
Joined: Wed Feb 08, 2017 2:10 am

by wheelbuilder

Nice. You are killing it with all these carbon repairs!

mag
Posts: 172
Joined: Thu Mar 16, 2017 12:23 pm

by mag

Excellent :D
Please describe also your repair process and stuff you used. At least briefly.

Marin
Posts: 2957
Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

Excellent!

Yes, please post material sources & process steps - that would be a big help.

by Weenie


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josemari220
Posts: 9
Joined: Sat Nov 05, 2011 9:52 pm

by josemari220

Thanks everybody for support.
It is necessary minimal skills to the job, but nothing special. You can find many videos about carbon repair step by step.
I bought materials in ebay. You need carbon fiber cloth and laminating epoxy resin. some sand paper, a brush, solvent, normal cloth, plastic film and an old inner tube.
The process is to prepare the area to repair, put pieces of carbon cloth, wet them with epoxy resin, wrap it with a full of holes plastic film, then an absorvent cloth, and press all the sandwich wraping it with a long tape of elastic rubber, or a shrinkable tape. With it you compress a lot the wet carbon cloth, and the epoxy excess goes out through the holed plastic, to the absorvent outer cloth. You let it cure and you can discover the result. Sand it to get smooth surface and repeat until job is completed.
The broken rail takes me 4 stages. I prefer to repeat more times, than put a very thick layer that is more difficult to control.
You can see complete step by step proccess pictures in my other post about repair a Sram Red crank.

viewtopic.php?p=1394324#p1394324

I hope it will be usefull for some of you.

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