Is this a crack on the carbon frame?
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 8 hours ago
AmirAmir
1324
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 8 hours ago
AmirAmir
1324
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♦
6 hours ago
Thanks for the tip @Criggie
– Amir
1 hour ago
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 8 hours ago
AmirAmir
1324
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 8 hours ago
AmirAmir
1324
asked 8 hours ago
AmirAmir
1324
edited 8 hours ago
Amir
asked 8 hours ago
AmirAmir
1324
asked 8 hours ago
AmirAmir
1324
asked 8 hours ago
AmirAmir
1324
1324
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♦
6 hours ago
Thanks for the tip @Criggie
– Amir
1 hour ago
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♦
6 hours ago
Thanks for the tip @Criggie
– Amir
1 hour ago
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♦
6 hours ago
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♦
6 hours ago
Thanks for the tip @Criggie
– Amir
1 hour ago
Thanks for the tip @Criggie
– Amir
1 hour ago
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 8 hours ago
Rider_XRider_X
24.9k14595
4
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
7 hours ago
1
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
2 hours ago
2
@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
1 hour ago
add a comment |
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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 8 hours ago
Rider_XRider_X
24.9k14595
4
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
7 hours ago
1
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
2 hours ago
2
@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
1 hour ago
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 8 hours ago
Rider_XRider_X
24.9k14595
4
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
7 hours ago
1
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
2 hours ago
2
@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
1 hour ago
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 8 hours ago
Rider_XRider_X
24.9k14595
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 8 hours ago
Rider_XRider_X
24.9k14595
edited 8 hours ago
answered 8 hours ago
Rider_XRider_X
24.9k14595
answered 8 hours ago
Rider_XRider_X
24.9k14595
answered 8 hours ago
Rider_XRider_X
24.9k14595
24.9k14595
4
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
7 hours ago
1
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
2 hours ago
2
@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
1 hour ago
add a comment |
4
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
7 hours ago
1
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
2 hours ago
2
@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
1 hour ago
4
4
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
7 hours ago
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
7 hours ago
1
1
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
2 hours ago
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
2 hours ago
2
2
@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
1 hour ago
@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
1 hour ago
add a comment |
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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♦
6 hours ago
Thanks for the tip @Criggie
– Amir
1 hour ago