Is this a crack on the carbon frame?Metal seat post with carbon fiber frame?Repair superficial damage to a carbon frameExtending integrated carbon seat tubeCarbon frame damageCarbon frame cracksDoes a carbon frame need two-bolt seat clamp?Should I worry about a chipped carbon mountain bike frame?Lugged carbon frame repaircan I use an aluminium seatpost to install a tagalong on a carbon fiber frame?carbon seat post to carbon seat tube - necessary to loosen periodically to prevent seizing in place?
Why does nature favour the Laplacian?
How to pronounce 'c++' in Spanish
What term is being referred to with "reflected-sound-of-underground-spirits"?
Random Forest different results for same observation
Like totally amazing interchangeable sister outfits II: The Revenge
Can an Area of Effect spell cast outside a Prismatic Wall extend inside it?
Critique of timeline aesthetic
How much cash can I safely carry into the USA and avoid civil forfeiture?
Was there a shared-world project before "Thieves World"?
How to limit Drive Letters Windows assigns to new removable USB drives
Do I have an "anti-research" personality?
How to not starve gigantic beasts
Elements that can bond to themselves?
Initiative: Do I lose my attack/action if my target moves or dies before my turn in combat?
a sore throat vs a strep throat vs strep throat
On The Origin of Dissonant Chords
How to have a sharp product image?
How did Captain America manage to do this?
Does a large simulator bay have standard public address announcements?
can anyone help me with this awful query plan?
Can SQL Server create collisions in system generated constraint names?
Dynamic SOQL query relationship with field visibility for Users
Is the claim "Employers won't employ people with no 'social media presence'" realistic?
Multiple options vs single option UI
Is this a crack on the carbon frame?
Metal seat post with carbon fiber frame?Repair superficial damage to a carbon frameExtending integrated carbon seat tubeCarbon frame damageCarbon frame cracksDoes a carbon frame need two-bolt seat clamp?Should I worry about a chipped carbon mountain bike frame?Lugged carbon frame repaircan I use an aluminium seatpost to install a tagalong on a carbon fiber frame?carbon seat post to carbon seat tube - necessary to loosen periodically to prevent seizing in place?
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
asked Apr 6 at 20:49
AmirAmir
1536
add a comment |
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
asked Apr 6 at 20:49
AmirAmir
1536
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
add a comment |
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
asked Apr 6 at 20:49
AmirAmir
1536
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
carbon
asked Apr 6 at 20:49
AmirAmir
1536
asked Apr 6 at 20:49
AmirAmir
1536
edited Apr 6 at 21:00
Amir
asked Apr 6 at 20:49
AmirAmir
1536
asked Apr 6 at 20:49
AmirAmir
1536
asked Apr 6 at 20:49
AmirAmir
1536
1536
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
add a comment |
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
3
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
add a comment |
1 Answer
1
active
oldest
votes
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "126"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fbicycles.stackexchange.com%2fquestions%2f60186%2fis-this-a-crack-on-the-carbon-frame%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
edited Apr 6 at 21:41
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14596
25.1k14596
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
5
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
Thanks for contributing an answer to Bicycles Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fbicycles.stackexchange.com%2fquestions%2f60186%2fis-this-a-crack-on-the-carbon-frame%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28