Help, is that a carbon damage?
03-16-23, 02:54 PM
#1
Senior Member
Thread Starter
Join Date: Mar 2016
Location: South Italy
Posts: 951
Bikes: BMC SLR01; Cannondale Trail; Lot's of project and vintage bikes..
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
Liked 156 Times
in
95 Posts
Help, is that a carbon damage?
I removed the fork from the bike, just to clear it, removing some debris/dust.
Until i noticed a weird feeling.
If you inspect the carbon fiber with a light you can see lines, so there is nothing weird....
At the same time a crack will looks different. Those lines seems came from factory due to the molding process etc.
Here the video:
what do you think?
Until i noticed a weird feeling.
If you inspect the carbon fiber with a light you can see lines, so there is nothing weird....
At the same time a crack will looks different. Those lines seems came from factory due to the molding process etc.
Here the video:
what do you think?
03-16-23, 04:41 PM
#2
Steel is real
Join Date: Mar 2013
Location: Not far from Paris
Posts: 2,021
Bikes: 1992Giant Tourer,1992MeridaAlbon,1996Scapin,1998KonaKilaueua,1993Peugeot Prestige,1991RaleighTeamZ(to be upgraded),1998 Jamis Dragon,1992CTWallis(to be built),1998VettaTeam(to be built),1995Coppi(to be built),1993Grandis(to be built)
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 566 Post(s)
Liked 779 Times
in
512 Posts
I wouldn't trust a fork presenting such visible and possible manufacturing defects
Likes For georges1:
03-16-23, 05:10 PM
#3
Senior Member
Lots of movement in that video, makes it hard to give a virtual visual inspection. Solid frame images might be more helpful, or give it the ol' tap test.
Likes For TiHabanero:
03-17-23, 05:32 AM
#4
Senior Member
Join Date: Jan 2023
Location: Eastern Shore MD
Posts: 608
Bikes: Lemond Zurich/Trek ALR/Giant TCX/Sette CX1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 383 Post(s)
Liked 529 Times
in
264 Posts
For piece of mind - get it checked by a professional.
That's an important part right there - can put you on the deck hard if it fails.
Since exploding CF has put me on the deck hard - I err on the side of caution all the time.
That's an important part right there - can put you on the deck hard if it fails.
Since exploding CF has put me on the deck hard - I err on the side of caution all the time.
03-17-23, 08:41 AM
#5
Senior Member
Thread Starter
Join Date: Mar 2016
Location: South Italy
Posts: 951
Bikes: BMC SLR01; Cannondale Trail; Lot's of project and vintage bikes..
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
Liked 156 Times
in
95 Posts
here guys what bmc told me.
I hope this tread will be usefull for someone in the future, at least to feel secure with those strange carbon fiber patterns.
"Thanks for your passion and to reach out BMC.
The "waves" that you feel on the steerer tube are caused by the normal drying of the clear coating layer.
On the other parts of the frame which are normally visible it would be finely finished and polished, but on the inside the frame this process is skipped.
The imperfections on the clear coating inside the frames are not to be considered in anyways dangerous.
Best Regards
BMC-Switzerland team"
I hope this tread will be usefull for someone in the future, at least to feel secure with those strange carbon fiber patterns.
"Thanks for your passion and to reach out BMC.
The "waves" that you feel on the steerer tube are caused by the normal drying of the clear coating layer.
On the other parts of the frame which are normally visible it would be finely finished and polished, but on the inside the frame this process is skipped.
The imperfections on the clear coating inside the frames are not to be considered in anyways dangerous.
Best Regards
BMC-Switzerland team"
Likes For CrowSeph:
03-17-23, 09:56 AM
#6
I'm good to go!
Join Date: Jul 2017
Location: Mississippi
Posts: 14,159
Bikes: Tarmac Disc Comp Di2 - 2020
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 5840 Post(s)
Liked 4,462 Times
in
3,077 Posts
I agree with what BMC said.
There is too much unsubstantiated fear mongering of carbon bikes to be found still for something that has been with us for 40 some years. Some try to point out particular incidents they've seen or had, but that is circumstantial and ignores all the failures that steel and aluminum frames and forks have had.
Not that you are wrong to have questioned something you are not certain of. Hopefully this thread won't make others fear carbon or serve the fearmongers.
There is too much unsubstantiated fear mongering of carbon bikes to be found still for something that has been with us for 40 some years. Some try to point out particular incidents they've seen or had, but that is circumstantial and ignores all the failures that steel and aluminum frames and forks have had.
Not that you are wrong to have questioned something you are not certain of. Hopefully this thread won't make others fear carbon or serve the fearmongers.
03-17-23, 11:28 AM
#7
Advocatus Diaboli
Join Date: Feb 2015
Location: Wherever I am
Posts: 8,482
Bikes: Merlin Cyrene, Nashbar steel CX
Mentioned: 14 Post(s)
Tagged: 1 Thread(s)
Quoted: 4639 Post(s)
Liked 1,472 Times
in
959 Posts
BMC mention and a video.. I do remember this one which got a lot of eyeballs a few years ago:
03-19-23, 12:48 PM
#8
Senior Member
Seņor Ti makes an excellent suggestion. Intact, composite structures tend to pass "the violin test". If you tap on them, they resonate, like a violin, or guitar. If they have a defect, they don't. I would also examine the suspect spot with a good magnifier (~10x) to reassure myself.
Having an experienced expert look at it might also be more informative than our group speculation.
Having an experienced expert look at it might also be more informative than our group speculation.
