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Doubts on Carbon Longevity

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Old 07-20-10 | 04:34 AM
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Originally Posted by roccobike
This response will be similar to the last time I responded to this question. I'm not aware of any CF frames from major brands that have acquired a reputation for failure that would injure the rider. Trek has had problems with bottom bracket housing coming loose thus rendering the frame useless. I understand this is more common on their MTBs. But if you are the original owner, they will replace the frame. As for other materials, bonded frames from the 80's had their share of problems and it's still not advisable to spread the 126mm dropouts to 130 to upgrade one of those frames.
The only other frame material where I know there have been major failures after long periods of time is steel. There are a number of threads over on the C&V about someone's steel frame giving up due to rust after 20 or 30 years and thousands of miles of service. I've never had this happen to me and my Nishiki Ariel MTB is still in service, still taking a pounding over non-paved trails. Of course you can prevent many steel frame failures by using frame saver.
https://www.bustedcarbon.com/
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Old 07-20-10 | 05:01 AM
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https://www.wreckedexotics.com/archive/

cars get crashed sometimes. Cars are dangerous. We shouldn't drive cars.
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Old 07-20-10 | 08:27 AM
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Originally Posted by Flatballer
mental game mostly. It mixes things up, keeps it exciting. Buying new bikes is fun.
We are also often sponsored and get discounts and can sell our old bike for nearly as much as we paid.
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Old 07-20-10 | 08:31 AM
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umd; what bars do you use?
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Old 07-20-10 | 08:46 AM
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Originally Posted by NathanC
umd; what bars do you use?
Are you alluding to my broken carbon bars?
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Old 07-20-10 | 08:48 AM
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No, was just interested to know.
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Old 07-20-10 | 08:57 AM
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Originally Posted by NathanC
No, was just interested to know.
For most of this season I've been using some old Bontrager bars I had laying around after I broke my [carbon] 3T Ergosum bars. I bought new [aluminum] ones but have been too lazy to swap them on until I need to replace my bar tape again...

As far as the OP's question, I destroyed an aluminum frame in a crash, but I've crashed my carbon TCR countless times during the 25k-30k miles I rode it before replacing it with my Tarmac. Rode that Tarmac for a season and replaced with a Tarmac SL2 which is in it's second season, and has probably 20k-25k miles on it as well.
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Old 07-20-10 | 08:59 AM
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Originally Posted by ciocc_cat

If a frame is well-made by a reputable builder, is should last for many years (if properly cared for) regardless of whether it is steel, aluminum, titanium, CF or bamboo.
amen to that.
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Old 07-20-10 | 09:32 AM
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Most of the comments in this thread have been addressing catastrophic failure. But isn't the question more about fatigue strength?
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Old 07-20-10 | 09:34 AM
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Originally Posted by PhilNYC
Most of the comments in this thread have been addressing catastrophic failure. But isn't the question more about fatigue strength?
CF doesn't "fatigue" like aluminum does. The biggest problem with some of the early carbon frames is delamination and lugs coming unglued.
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Old 07-20-10 | 09:43 AM
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Some CF frames will last just fine even with a lot of abuse. I have an 1999 Trek 5000 OCLV that I've taken up and down fire roads around here and other places plenty of times, and it's holding up just fine. I've been through a couple of bottom brackets, a few headsets, a few sets of wheels, and the cranks are perceptibly worn in spots from rubbing my shoes. The frame is holding up just fine. A guy at work who parks his bike near mine rides an old lugged-tube style Trek CF bike (3300?) that he bought used. His is much older than mine and is in good shape as well.

I've also broken a couple of steel frames racing, and seen a few more steel frames broken racing. It used to be that you could get tubes replaced in a steel frame pretty cheaply, but there are fewer and fewer framebuilders around to do it. I've seen CF bikes go down hard in races and come back up fine (the look 496 and 596 track bikes, in particular), and others disintegrate (a couple of BMC track machines). I've crashed my Giant TCR track frame pretty hard and it's fine-- a couple of chips out of the clearcoat that were easily filled. I crashed into the back of my Specialized Langster Pro at full speed in a madison (aluminum, it belonged to someone else at the time) and it's fine, too. I use it as a TT frame so I don't have to change setups. I think at this point all my steel frames mostly just hang on the wall.
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Old 07-20-10 | 02:31 PM
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Height is not the most important thing in sizing a frame. Sizes can vary wildly for the same height depending on other measurements.
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Old 07-20-10 | 03:05 PM
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Originally Posted by umd
Height is not the most important thing in sizing a frame. Sizes can vary wildly for the same height depending on other measurements.
I'm not sure I would agree. Height (specifically from the seat to the crank) seems like it *is* the --most-- important measurement.

I think what you mean, or at least what I think, is that there are other very important measurements that can make or break your comfort on the frame as well. Having to large of a drop from the saddle to handlebars, to long of a top tube, etc etc can make a bike really uncomfortable to ride despite being the correct vertical size.
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Old 07-20-10 | 03:18 PM
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Originally Posted by PaulRivers
I'm not sure I would agree. Height (specifically from the seat to the crank) seems like it *is* the --most-- important measurement.
The height of the person is not that import.

All the people that say "I'm x tall and I ride a bike that is y, and you are x tall also, so that bike that is z is too big/small for you" are doing it wrong.
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Old 07-20-10 | 03:52 PM
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Originally Posted by umd
The height of the person is not that import.

All the people that say "I'm x tall and I ride a bike that is y, and you are x tall also, so that bike that is z is too big/small for you" are doing it wrong.
Aaaaah. Well - I was wrong, in that case I pretty much agree with you. :-D Height can give you rough ballbark (if you're 6"2 and riding a 52cm frame it's nearly certainly to small for you), but height and inseam is a lot better. I think?
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Old 07-20-10 | 04:15 PM
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Originally Posted by PaulRivers
Aaaaah. Well - I was wrong, in that case I pretty much agree with you. :-D Height can give you rough ballbark (if you're 6"2 and riding a 52cm frame it's nearly certainly to small for you), but height and inseam is a lot better. I think?
Inseam and torso (which effectively combine to give height)
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Old 07-20-10 | 04:19 PM
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If you like Italian 2 wheeled machines and want to spend the dough, look at a Colnago. They make the steel frame in 65cm.
https://www.wrenchscience.com/road/fr...-X+Light+-2010

I'm heavier than you and I have over 20K miles on a Gunnar steel frame which cost $700 back in 06. You can get them custom sized, as well.
Cheaper still is Soma. Steel and you can get the right size, once you figure that part out.

In carbon, some Ridley models come in big sizes with tall head tubes.
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Old 07-20-10 | 06:18 PM
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Originally Posted by tall2wheeler
So, here is my question for the riders who would like to contribute: can a CF frame last 6-10 years if treated properly under normal riding conditions (not racing, not in the rain, avoiding pot holes and rough roads, but still putting in 100-150 miles per week) and stored in doors? I live in TX and so I ride in the heat and sun. I never wreck. I have in the past but now I don't put myself in the position to wreck. So.... will it last? Will the Bianchi Infinito go the distance? Coast to Coast.... hardy har har.
famous last words

Carbon bike owners don't buy carbon bikes for the longevity of it. Owners of carbon want stiff performance for climbing and/or sprinting doubled with a smooth ride.

You sound more like a recreational rider and I imagine in Texas your not hitting any cat 1 climbs very often. I think you should reconsider Ti. It sounds more suitable for you since you want longevity coupled with a nice ride. Check out the Habenero's as others have suggested and also the Ti frame over a PBK.com. Both bikes I have riden and was very much impressed. I do not think you will be dissapointed in Ti unless you plan on racing seriously in the future and in that case longevity of a frame isn't as important as performance.
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Old 07-20-10 | 06:45 PM
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Do you keep your cars for 10-20 years too?
Yeah JTD, do you? My 1993 LS400, which was motoring just fine, just bit the dust because a gigantic tree limb fell on it. At least I still have my 1992 RB-1.
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Old 07-20-10 | 06:53 PM
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Originally Posted by umd
We are also often sponsored and get discounts and can sell our old bike for nearly as much as we paid.
you want to hook a brother up UMD?
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Old 07-20-10 | 07:00 PM
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Originally Posted by ktanner777
famous last words

Carbon bike owners don't buy carbon bikes for the longevity of it. Owners of carbon want stiff performance for climbing and/or sprinting doubled with a smooth ride.
generalize much?
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Old 07-20-10 | 07:00 PM
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Originally Posted by ktanner777
you want to hook a brother up UMD?
just join a race team. You don't have to be fast. Even Cat 4s often get pretty good discounts on apparel and equipment.
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Old 07-20-10 | 07:08 PM
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Originally Posted by foresthill
generalize much?
I don't think I was. I mean you have guys who genuinely need to stiffness of a carbon bike for racing and you have those who just want to look like a pro. For someone who is not racing does it really make much of a difference whether they are riding carbon, Al or Ti...nah. 90% of people on carbon bikes I would imagine aren't demanding out of it what it is built to do. The guys who use carbon for what it is made to do are sponsored so arent concerned with longevity.
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Old 07-20-10 | 07:10 PM
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Originally Posted by ktanner777
famous last words

Carbon bike owners don't buy carbon bikes for the longevity of it. Owners of carbon want stiff performance for climbing and/or sprinting doubled with a smooth ride.
I bought my carbon bike for longevity and ride quality, not for doing sprints or time trials. The manufacturer of my bike, Calfee, has carbon fiber frames built in the late 80's with over 120,000 miles on them and they ride just fine. I don't race, I ride do solo rides and group rides on the weekends. I test rode ti bikes, steel bikes and carbon bikes and liked the way the bike I bought rides. It was calling me as I was riding it.

In the past four years I have become faster and now sprinting is something that appeals to me. I am sure glad I bought that CF bike.

My next bike will be Ti not because it is stronger but because it is different from what I already have.
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Old 07-20-10 | 07:11 PM
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Originally Posted by PhilNYC
Most of the comments in this thread have been addressing catastrophic failure. But isn't the question more about fatigue strength?
No.
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