Cracked carbon downtube, seeking advice

Discuss light weight issues concerning road bikes & parts.
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simurs4
Posts: 59
Joined: Mon Apr 09, 2012 11:32 am
Location: Rosenheim, Germany

by simurs4

So I took abit of a tumble last night on my old faithful SL3 S-Works. The bike landed quite hard but I more or less was totally unscathed.
I was not far from home yesterday when it happened so I just rode home slowly and checked it properly once I got back, only to find that the downtube has cracked almost the whole way round, about half way down the tube.
I have had this bike new since 2011 and it has been through alot, including being raced on in the past and being hit by cars on a couple of occasions. The last time this happened was 2 years ago when the fork cmpletely severed in two, requiring a replacement.
Since this bike is somewhat sentimental to me, I would prefer not to junk it but retire it to stationary trainer duties only.
My question is if anybody here have successfully had a carbon repair carried out on a similar spot and were able to continue using the bike afterwoods? I have no intention of using it on the road again after this, so I would think that using it on the trainer would not be quite os bad. If this is a stupid idea please let me know!

Marin
Posts: 3584
Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

Should be an easy repair, look for a good repair shop.

alcatraz
Posts: 2565
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

You'd be surprised to know how much is repairable.

A big repair shop here in China is showing pictures of a head tube with big chunks missing, repaired looking as new.

It's not cheap though and the whole frame will probably need repainting. That's what inflates the cost as it will need to be sanded/sandblasted and completely repainted. Logos cost a lot to make and add.

A friend fixed his down tube. It ended up costing -250usd for the repair, ~250usd for the paint job and another 30usd for the logos that exceeded the ones included in the paint job price.

simurs4
Posts: 59
Joined: Mon Apr 09, 2012 11:32 am
Location: Rosenheim, Germany

by simurs4

Cheers for the replies. I have seen some pictures of pretty gnarly carbon damage that has been repaired to look almost better than new, so I think I'll give it a go.

If the damage was in one of the seat stays or chain stays I may be abit more hesitant but the down tube I would think would not suffer from as much stress torsionally.

Luckily my SL3 is a Project Black so its just raw carbon with some clear coat and a couple white S-Works logos. So if anything I would just get the thing clear coated again and leave the logos off, since it will just sit on the trainer once its fixed.
Now to start looking for repairers around Munich.

ruklaw
Posts: 36
Joined: Sat Apr 19, 2014 12:45 pm

by ruklaw

If it's going to just sit on the trainer are you sure it's even worth repairing? I mean, it's still in one piece now isn't it?

Or you could just buy a repair kit online and put a wrap on yourself to reinforce the damaged area?

Lieblingsleguan
Posts: 179
Joined: Mon Mar 23, 2015 9:47 pm

by Lieblingsleguan

simurs4 wrote:
Thu Jul 18, 2019 1:55 pm
Now to start looking for repairers around Munich.
Carbon-Klinik Ammersee, I only heard great things about them.

Lieblingsleguan
Posts: 179
Joined: Mon Mar 23, 2015 9:47 pm

by Lieblingsleguan

Doublepost

reedplayer
Posts: 570
Joined: Sat Nov 14, 2015 10:10 am

by reedplayer

Lieblingsleguan wrote:
Sat Dec 21, 2019 9:28 pm
simurs4 wrote:
Thu Jul 18, 2019 1:55 pm
Now to start looking for repairers around Munich.
Carbon-Klinik Ammersee, I only heard great things about them.
yes, they do a very good job, me, and numerous mates, had a lot of positive experiences with c-k. atm they are repairing dropout of my urgestalt frame. but they are kind of fully booked, causing long waiting times: i submitted the frame five months ago. beginning of 2020, hence in few weeks, repair is claimed to be finished. :soon:

spud
Posts: 856
Joined: Sat Feb 07, 2009 5:52 am

by spud

In your case, you can either spend $$ to get the thing repaired to a fully usable state, including cosmetics, fit for the road. Others here have offered estimates of that cost. In the case of using it on the trainer only, I wouldn't bother getting a professional repair. Instead, I'd get some carbon and resin and do the repair myself for a lot less money. Reason being that the trainer won't subject the downtube to the dynamic loads that road riding does, and a heavy, ugly and inefficient repair won't be cause for concern for your safety.

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