I find it strange that if Carbon is such an inherently dodgy material that so many of the big manufacturers are pushing forward with it, surely it woudnt be worth their while if they were going to get warranty claims every 5 minutes...... I'm not sure that the shorter product lifespan argument makes much sense. Anyhow, carbon frame, seapost and bars and I'm not dead yet.
Bike Forum
Epic carbon fork fail.!
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Posted 9 months ago #
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I know someone who had a nasty accident after a rabbit jumped into their front wheel and brought things to a rapid halt.
Would you care to elaborate on this?!
Posted 9 months ago # -
YAWN The record is as broken as those forks!
If you guys really want a bike that won't hurt you when something breaks then you are going to have to ask for one with some redundancy and be prepared to ride a bike that weighs 90% more as all the critical structure (which lets face it is pretty much everything on a bike) has to be doubled up. Regardless of the material every bike part is made for minimum weight for what it does and as such any failure will normally result in total failure of the part.
I find these scare scaremongering views on carbon but no actual real knowledge of it or seemingly metal failures quite ignorant tbh.
Now for some evidence:
All look pretty catastrophic to me and all magical metal which couldn't possibly have hidden faults
(look up United Airlines Flight 232 )PS glad your mate is okay. Bike parts can be replaced.
Posted 9 months ago # -
how is it not down to human error Do you think its the carbons fault in fact its pretty useless just sat there on its own,Just like aluminium,Steel,Titanium ,Somewhere along the line someone made an error wether it be design manufacturing or end use ,end of lifecycle .it was a human that brought it into existence it all boils down to that at the end of the armchair engineering analysis things don 't just break.
Posted 9 months ago # -
Where the OP's forks failed0looks like a design flaw to me, unless there was an impact right there.
I can't imagine a pothole did it, he'd have flatted and trashed the rim.
An impact of this magnitude means you are over the bars no matter what material your forks are.
Posted 9 months ago # -
Thread resurrection.
Scientific detail - since I last visited this thread I have seen a BMC road carbon road bike with a fracture at the seattube/seat stay junction, and a Yeti ARS five with a broken swing arm.
Just keeping you up to date. I may be back. No failures noted in other materials.
Posted 8 months ago # -
Scientific detail - since I last visited this thread I have seen a BMC road carbon road bike with a fracture at the seattube/seat stay junction, and a Yeti ARS five with a broken swing arm.
Listen everybody knows that they build rocketships and jet aeroplanes out of carbon.
There's only 2 possibilities here - either you're lying or these riders were travelling faster than both of these.Posted 8 months ago # -
I've seen a titanium frame cracked through on a ride in Swinley. Does that make all titanium suspect?
Posted 8 months ago # -
I reckon so. I've seen my mate's Ti frame snap clean in two on the seatstay & chainstay. Lethal material for a frame if you ask me.
Posted 8 months ago # -
That squirrel really had a death wish. The worrying thing is that squirrels at Swinley seem to line up to do exactly that!
My mate did similar with a pigeon in London. Nobody cared - pigeons are foul, fact!
Posted 8 months ago # -
Far out!!! Poor squirrel alright. Wicked pics!
Posted 8 months ago # -
Listen everybody knows that they build rocketships and jet aeroplanes out of carbon.
There's only 2 possibilities here - either you're lying or these riders were travelling faster than both of these.Genius. I wish I worked in a bike shop again just so I could use this line to deny EVERY warranty that came along
Posted 8 months ago # -
Bike number six to go in the last two months. This time a Cube near the seatpost. Cube are replacing without the slightest fuss.
Pinarello FP x 2
Time x 1
Planet X x 1
Boardman x 1
Cube x 1Posted 8 months ago # -
The squirrel story
http://pardo.net/bike/pic/fail-016/Posted 8 months ago # -
Bike number six to go in the last two months.
What are you doing to them?
In the last 15 years I've had 5 bikes and still run 3 of them. The 15 yr old GT Avalanche looks like it has a stress fracture and my Dave Quinn frame gave up after a high speed off where the front wheel got caught in a drain that crossed the road and stopped instantly throwing me about 10-15m down the road.
http://www.flickr.com/photos/think180/3217750376/sizes/m/in/set-72157600206274323/
http://www.flickr.com/photos/think180/3216918939/sizes/m/in/set-72157600206274323/Posted 8 months ago # -
Ah they're not mine, but they belong to fellow club members.
Posted 8 months ago # -
Ah they're not mine, but they belong to fellow club members.
That's alright then, nothing to worry about.Posted 8 months ago # -
Unless youre behind them at the time.
Posted 8 months ago # -
I have ridden aluminium, steel & titanium hardtail frames. They have all cracked. I have no reason to believe that a carbon frame would behave any differently!
Posted 8 months ago # -
Don Ferris of Anvil said on:
http://www.frameforum.org/forum2/index.php?showtopic=2317
That: "Even the largest and most efficient cargo aircraft have a payload ratio of less than 4 to 1, with most being less than 3 to 1. In other words, for one pound of aircraft weight, they can carry 3 pounds of payload. A 20 pound road bike with only a 150 pound rider has a load carrying ratio of 8.5 to 1. Put a 200-pounder on that bike and it grows to 11 to 1. Put that 200 pounder on a 40-pound DH rig designed for 9-g loads, and you're still at 6 to 1. No the best way to compare stresses obviously, but it does put into perspective how bicycle frames are exceptionally stressed for their mass."Similar story applies to CFRP, if used on aeroplanes; there is a system of classification of parts on planes eg critical parts, sensitive part. Sensitive parts, if they fail, will cause a drop in aircraft performance in flight eg speed, fuel consumption etc, Critical parts, if they fail, will lead to the plane falling out of the sky. CFRP is not first choice for critical parts.
Posted 8 months ago # -
Similar story applies to CFRP, if used on aeroplanes; there is a system of classification of parts on planes eg critical parts, sensitive part. Sensitive parts, if they fail, will cause a drop in aircraft performance in flight eg speed, fuel consumption etc, Critical parts, if they fail, will lead to the plane falling out of the sky. CFRP is not first choice for critical parts
But isn't the rear stabiliser and rudder on the A380 all carbon? I'd say that was a critical part... Certainly wouldn't want to be in one if it broke off!
FWIW I have no issues with carbon bike bits. I've seen catastrphic failures in all materials and I've seen carbon bend without failure. After all the chainstays on a Cannondale Scalpal are carbon and designed to bend.
Posted 8 months ago # -
Was the hub still clamped in the dropouts after the crash and can we see a pic of the wheel?
Posted 8 months ago # -
Didn't know Chuck Norris rode mountain bikes
Posted 8 months ago # -
No the best way to compare stresses obviously,
The most important part of that paragraph.
Posted 8 months ago # -
The
most importantonly useful part of that paragraph.
FTFYCritical parts, if they fail, will lead to the plane falling out of the sky. CFRP is not first choice for critical parts
I'd recommend not flying on a 787 or an A380 (or indeed any future aircraft from Airbus or Boeing) - carbon fibre appears to be the first choice for most critical parts on both of those. Or does some random punter on a cycling internet forum know better than Boeing/Airbus engineers?Posted 8 months ago # -
fearmongering at the very least
Posted 8 months ago # -
Do you think A380 etc. get leant against lammp posts and chucked in the back of transists?
Posted 8 months ago # -
Carbon Fork - Fine
Aluminium Frame - Goosed
Brick Wall - ScuffedPosted 8 months ago # -
I think the issue (if I have one) is that all the carbon I see breaking is 'just' happening. They've not been in crashes, just riding and racing road. The latest, the Cube is only two months old.
Whilst I've broken three steel frames (a hat trick, MTB/crosser/road bike) they've all hit something.
I've yet to see a steel or aluminium frame just break up on it's own.Posted 8 months ago # -
Once you've worked in a bike shop or really looked into warranty claims you realise that 99% of broken parts are broken from "just riding along and then....."
I was just riding along and my fork just snapped
Hitting a pot hole at speed is going to do some serious damage to any ROAD bike,
Posted 8 months ago # -
I've only ever broken one frame, a carbon Scott Genius which went right behind the bottom bracket where they'd stupidly designed it with two little carbon lugs connecting to the rear end. My Mk1 Ti456 is still going but I'm waiting for it to snap at the chain stay like all those other pre-brace models.
I dont really have a point, beyond if you weigh 85kg++ and ride a bike (badly) that isnt the last word in design perfection its gonna break some day.
I was just riding along when the Scott broke. Bike of the Year 2005 too.
Posted 8 months ago # -
oldgit - Member
Bike number six to go in the last two months. This time a Cube near the seatpost. Cube are replacing without the slightest fuss.
Pinarello FP x 2
Time x 1
Planet X x 1
Boardman x 1
Cube x 1You don't know if your PX is broken though do you?
Posted 8 months ago # -
In fact, 100% of the evidence says it's not, and you still keep suggesting it is, or is this a different one? Send it to me, I will ride it. If it's broken in 6 months you can have it back, if not then it's mine to keep, seems fair!
Anything brakes, anything made cheaply is more likely to break than a well made product (that's not necessarily directly proportional to cost), what it's made of is irrelevant. Carbon can crack and show signs of failure, alu can just fail. To say that you only get 'JRA' failures with carbon is ridiculous. The number of warranty carbon frames I dealt with at the LBS was in single figures, we had a Spark that cracked on the aluminium shock mount, and an OCLV frame where the bonded alu sleeve for the BB came out. A couple of S-Works frames with cracked alu swingarms too. Actual failures of carbon frames were incredibly rare.
Posted 8 months ago #
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