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Is this frame bad now? Accident on CF road bike.

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Is this frame bad now? Accident on CF road bike.

Old 03-14-14, 01:37 PM
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jowilson
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Is this frame bad now? Accident on CF road bike.

I was riding with a friend this morning and as we were starting off from a red light, his chain broke, and everything hit the fan from there on out. The chain caught in the spokes, seized up the rear wheel, and the derailleur hanger snapped off, and the RD flew around clockwise and hit the spokes. It was a mess, and luckily he was okay. Here are few pictures of the aftermath:

It's the last picture I want you to focus on. Yes the chain is broken, and the rear mech, chain, and hanger are f*****. But the frame to me looks toasted as well. If you push your fingernail on it, it moves. You can barely put your nail in-between a small crack (at least I hope it isn't one) and your nail will 'catch'. It's a shoddy picture, and I'm in the process of getting better ones. This picture is on the chainstay, and I believe there is another damaged spot on the seat stay that may have been caused by this incident. I've suggested he get it looked at professionally, and not ride it until it is deemed unstructural damage, but I predict it will be the same, unfortunate conclusion as mine. What do the rest of you think of it? Is it just sc****d paint that is misleading? Or truly a crack from this accident?

Josh
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Old 03-14-14, 01:45 PM
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Ouch. I'm no expert, but the fact that pushing on the damaged area creates movement of the area tells me it is bad.
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Old 03-14-14, 01:48 PM
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I think the frame is damaged - are you any farther ahead? It's still necessary to have it checked. It's impossible to determine the extent of the damage and the possibility or cost of repair except by a CF professional in-person.
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Old 03-14-14, 01:51 PM
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time for a replacement .
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Old 03-14-14, 02:00 PM
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You know you kind of have to err on the side of caution with carbon fiber damage... but in this case I don't think there's any doubt.
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Old 03-14-14, 02:58 PM
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If you dont mind adding more stuff on the outside , you can treat it like a hole in a sailboat ..

sand the area rough , apply resin* add more Cloth ,Carbon fiber cloth. maybe fiberglass will do and saturate it

in *Catalyzed Epoxy ,
push out the air bubbles and let it cure , it will be a lump on the outside , but it may live a little longer .


probably RD, A NEW RD hanger , a chain and likely as the wear of one effects the other, a new casette too.

Of course this is just a Remote guess , from someone where there are a lot more Boats than carbon fiber frame bikes.
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Old 03-14-14, 04:52 PM
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Man....that is a bummer.....(Been there myself on my alum frame, but still salvagable. CF would bring me to tears!)

Interestingly a buddy of mine had almost that EXACT same scenario happen!! He rides a Specialized S-works full-tilt, carbon everything......he went to start off in a left-hand turn lane, fell over cuz he's clipped in.....his chain choked, busted RD, spokes, & somehow *didn't* hit the stay but had to tuck into fetal position to avoid being run over by folks in the next lane.

Amazingly, new RD, FD, cassette & some spokes to repair the wheel & he's back on the road. That was almost a VERY expensive choke! Still don't know exactly which part was the culprit but good since then.

P.S. Curious as to folk's idea of the cheapest replacement?? (China CF frame off ebay? OEM replacement? Good-used??) :shrug:
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Old 03-14-14, 05:40 PM
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First of all, understand that the left chainstay is possibly the best place to crack a frame, with only the left seatstay being better. A total catastophic failure of either (not both) is not likely to cause injury, so it's relatively safe to ride with a suspect stay.

If the frame is cracked, it can be repaired by a pro, such as Calfee, or even DIY as Fietsbob mentioned. You probably don't have to seek out a bike guy. There are many craftsmen working in CF these days, whether with model airplanes, racing boats, or motorsports. So a bit of local searching should find one willing and able to keep this bike rolling.

Otherwise, it you have no pride, and want something to buy time while you consider options you can do an emergency repair using the same logic as you would with a bone. Basically you want to splint it to immobilize the tube in the damaged area, and carry stresses across that spot. This can be as simple as 4 ice cream sticks laid across and held in place with one or two hose clamps. A bit of glue might help but ptobably isn't needed.

If you want to get fancier you can form a metal splint, or go back to the ice cream sticks, and stabilize it with turnings of wire, or wrap in heat shrink plastic for a tight solid fit. I've done a number of these field repairs, all intended to only last a short while, and none ever failing before a better repair was done, in one case 2 years later.

BTW- if the chain is damaged, but still a closed loop, odds are you have the sequence of events wrong. Most likely either the chain or derailleur got stuck in the wheel because of over shifting (unattended bent hanger) which led to aall the secondary damage including the chain.
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Old 03-14-14, 05:55 PM
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Just adding link to FBs post http://calfeedesign.com/repair/
Few of my buddies use them, and they were really happy with the results. Frames were as strong as when the bike was new, 1 of them didn't look great, but it all depends on where the frame was cracked. Calfee guys can glue it together to make it safe again.
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Old 03-14-14, 05:59 PM
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+1 on calfee. I used them on my cracked BB Trek OCLV. Works awesome now.
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Old 03-14-14, 09:13 PM
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Craig will no doubt do a better job , Cost will be shipping both ways and pay him his fee .
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Old 03-14-14, 10:06 PM
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I can not see the dark part of that damage, what I can see looks OK , if there are not cut strands where I can not see due to your photo resolution you might be OK. Do a nickel test.
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