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A very good reason not to have a full carbon fork...(13 posts)

A very good reason not to have a full carbon fork...Ken of Fresno
Aug 23, 2002 11:22 AM
A very good reason not to have an all carbon fork.

I had my bike upside down in the stand doing some regular maintenance, and I noticed some wear on the underside of the fork. Looks like a result of the occasional pebble that gets picked up and shot out the front. It doesn't seem to be a big deal, because the fork has carbon legs with an aluminum crown. But what about all of those FULL carbon forks out there? I seriously doubt that an all carbon fork would have faired as well after just 3,500 miles. If you can afford to replace your fork every few thousand miles it might not be a big deal, but I think I'll steer clear of the Look HSC-4 and the like.

Ken
My all carbon fork is fairing quite well...PsyDoc
Aug 23, 2002 11:28 AM
...after 6,573 miles. I have a Reynolds Ouzo Pro fork and I cannot detect any damage on the underside of the fork, not even a chip in the clearcoat. The difference in our experiences could be due to the roads that we ride. I live in South Georgia and ride on a lot of rural roads that are in fine condition and typically do not notice many rocks/pebbles on those roads.
re: A very good reason not to have a full carbon fork...frogg
Aug 23, 2002 11:53 AM
Stick some electrical tape over i, then no more problem.
re: A very good reason not to have a full carbon fork...aggieman
Aug 23, 2002 12:30 PM
I have a Bianchi with full carbon fork and over 7000 mi and no problems, not but on chip on side from a rock from another rider. Repaired with clear coat paint.

I think the type of roads you ride make a big difference.
I ride relatively smooth surfaces and the tires don't seem to pinch up many rocks.
Trek?filtersweep
Aug 23, 2002 1:02 PM
Looks like a Trek with a "fragile" paint job...? Paint doesn't hold your fork together- FWIW.
Thank you for sharing your engineering expertise...TJeanloz
Aug 23, 2002 1:22 PM
Some paint gets flecked off the bottom of your fork, and you correllate this somehow to a warning to all carbon fork riders? There's no reason to believe that this would do any more damage to a carbon fork than it would to an aluminum one.

In fact, maybe less; the ding in aluminum could cause a stress riser to develop, causing fork failure- this wouldn't happen in a woven all carbon fork...
TJ again is the voice of reason...merckx56
Aug 23, 2002 2:31 PM
aluminum also fails catastrophically, while carbon does not!
also, if that's the wear on the bottom of his fork after 3500 miles, a better maintenance plan may be in order!
TJ again is the voice of reason...Skip
Aug 23, 2002 5:45 PM
Carbon does fail catastrophically.
if you have shitty carbon...merckx56
Aug 24, 2002 3:27 PM
filament wound carbon, oclv and carbon that has been laid up in multiple stages will not fail catstrophically. i have broken (read cracked) several carbon bits and none have ever just exploded under me! my oclv made it 40 miles home with a cracked chainstay and never came apart. some shitty taiwanese made epx or the like might just explode but if you do your homework you find out that the types i mentioned rarely fail in such a way! the times i've seen carbon explose, thaey have been hit by cars or crashed in such a way that the load stresses were immense.
if you have shitty carbon...Skip
Aug 24, 2002 5:24 PM
By catastrophically, I mean that there is no warning of impending failure like with steel. There isn't any bending, deformation, crinkling, denting, oil-canning, etc. before it just fails - ie cracks. Sometimes the end result may not seem catastrophic (crash), but the CF part has failed. Can it be repaired - sometimes, sometimes it's just not worth the time or money to bias cloth relam, etc. especially if it is a structural component.
re: A very good reason not to have a full carbon fork...xxl
Aug 23, 2002 2:13 PM
No offense, but am I missing something? I see scraped paint (on a usually unseen part of the bike, FWIW), but I'm not seeing anything other than cosmetic damage.

My two cents, but I ride only steel.
huh???Carbon fiber fanatik
Aug 23, 2002 3:05 PM
I have seen more aluminum parts fail than I will ever see carbon parts fail. I trust carbon with my limbs and my health. Both my road and my mountain bike are full carbon monococque designs and my road forks are full carbon. I have my own reasons. But to make a long boring disertation short? There are no materials man made or otherwise with more research than carbon fiber and other composites. Proof? F-15, space shuttle..etc. Titanium is up there, but for my money and in my opinion? Carbon works.. period.
re: A very good reason not to have a full carbon fork...legs
Aug 23, 2002 5:29 PM
you got some well intentioned but bad methodology and you have come to a faulty conclusion. please try again.