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1

Recently picked up a steel frame and realised there was a crack on one side of the rear triangle, right by the seatpost. Crack seem to be contained towards the outer part of the tube so does not seem to affect wielded joint. Since it's a steel frame, I feel like it's good to go but a buddy thinks otherwise. Anyone experience something similar? Is it safe or am I doomed for a tragic death ☠? Any help appreciated!

frames steel crack

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asked 8 hours ago

D LuckyD Lucky

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D Lucky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I would say not a problem. That seam likely wasn't welded in the first place, just painted over.
  
  – Daniel R Hicks
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DanielRHicks that's a brazed frame
  
  – Argenti Apparatus
  7 hours ago
  

  
  
  
  

add a comment | 

1

Recently picked up a steel frame and realised there was a crack on one side of the rear triangle, right by the seatpost. Crack seem to be contained towards the outer part of the tube so does not seem to affect wielded joint. Since it's a steel frame, I feel like it's good to go but a buddy thinks otherwise. Anyone experience something similar? Is it safe or am I doomed for a tragic death ☠? Any help appreciated!

frames steel crack

share|improve this question

asked 8 hours ago

D LuckyD Lucky

822 bronze badges

New contributor

D Lucky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I would say not a problem. That seam likely wasn't welded in the first place, just painted over.
  
  – Daniel R Hicks
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DanielRHicks that's a brazed frame
  
  – Argenti Apparatus
  7 hours ago
  

  
  
  
  

add a comment | 

Recently picked up a steel frame and realised there was a crack on one side of the rear triangle, right by the seatpost. Crack seem to be contained towards the outer part of the tube so does not seem to affect wielded joint. Since it's a steel frame, I feel like it's good to go but a buddy thinks otherwise. Anyone experience something similar? Is it safe or am I doomed for a tragic death ☠? Any help appreciated!

frames steel crack

share|improve this question

asked 8 hours ago

D LuckyD Lucky

822 bronze badges

New contributor

D Lucky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 8 hours ago

D LuckyD Lucky

822 bronze badges

New contributor

D Lucky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 8 hours ago

D LuckyD Lucky

822 bronze badges

New contributor

D Lucky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 hours ago

D LuckyD Lucky

822 bronze badges

New contributor

D Lucky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 hours ago

D LuckyD Lucky

822 bronze badges

2 Answers
2

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2

I think the key question is: how much strength is the elliptical plate brazed over the top of the seat stay adding to the strength of the joint? I'd guess it is adding some strength, as without it there is not much material between the main seat stay tube and the brazed joint. I'd be worried about a crack forming just below the joint which could lead to the stay detaching from the main triangle

However, if one stay detaches it likely won't be a catastrophic failure, because the other stay will still be supporting the rear triangle.

Really you need to consider the risk yourself. If you are a heavy rider who rides the bike hard there's more risk, obviously. At the very least I'd periodically inspect that area to check for any other cracks forming.

share|improve this answer

answered 7 hours ago

Argenti ApparatusArgenti Apparatus

44.2k33 gold badges4545 silver badges106106 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I’d also recommend drilling a tiny hole at the end of the crack to stop propagation.
  
  – Andrew
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Agreed, at 70kg I'm by no means heavy so I don't see this being too big of a problem. That said, this would be interesting to see through so I'll be keeping an eye on it for a while and if anything changes I'll report in for science. Thanks guys!
  
  – D Lucky
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  A good framebuilder could easily repair that, possibly without much damage to the paintjob.
  
  – Carel
  3 hours ago
  

  
  
  
  

add a comment | 

2

My guess is that when the frame was made the solder didn't flow into that gap completely and it's been this way since it was new covered over by paint.

If it gets worse over time it can be repaired.

If you don't feel comfortable with it you can get it repaired now.

Argenti is right, a worst case scenario is the seat stay detaching when you need it most.

Even if that happens you have other tubes to hold things together so the rear wheel won't fly off - you'll have time to slow down and get off the bike, so you might have to walk a long ways.

share|improve this answer

answered 4 hours ago

David DDavid D

3,46211 gold badge55 silver badges1919 bronze badges

add a comment | 

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2

I think the key question is: how much strength is the elliptical plate brazed over the top of the seat stay adding to the strength of the joint? I'd guess it is adding some strength, as without it there is not much material between the main seat stay tube and the brazed joint. I'd be worried about a crack forming just below the joint which could lead to the stay detaching from the main triangle

However, if one stay detaches it likely won't be a catastrophic failure, because the other stay will still be supporting the rear triangle.

Really you need to consider the risk yourself. If you are a heavy rider who rides the bike hard there's more risk, obviously. At the very least I'd periodically inspect that area to check for any other cracks forming.

share|improve this answer

answered 7 hours ago

Argenti ApparatusArgenti Apparatus

44.2k33 gold badges4545 silver badges106106 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I’d also recommend drilling a tiny hole at the end of the crack to stop propagation.
  
  – Andrew
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Agreed, at 70kg I'm by no means heavy so I don't see this being too big of a problem. That said, this would be interesting to see through so I'll be keeping an eye on it for a while and if anything changes I'll report in for science. Thanks guys!
  
  – D Lucky
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  A good framebuilder could easily repair that, possibly without much damage to the paintjob.
  
  – Carel
  3 hours ago
  

  
  
  
  

add a comment | 

2

I think the key question is: how much strength is the elliptical plate brazed over the top of the seat stay adding to the strength of the joint? I'd guess it is adding some strength, as without it there is not much material between the main seat stay tube and the brazed joint. I'd be worried about a crack forming just below the joint which could lead to the stay detaching from the main triangle

However, if one stay detaches it likely won't be a catastrophic failure, because the other stay will still be supporting the rear triangle.

Really you need to consider the risk yourself. If you are a heavy rider who rides the bike hard there's more risk, obviously. At the very least I'd periodically inspect that area to check for any other cracks forming.

share|improve this answer

answered 7 hours ago

Argenti ApparatusArgenti Apparatus

44.2k33 gold badges4545 silver badges106106 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I’d also recommend drilling a tiny hole at the end of the crack to stop propagation.
  
  – Andrew
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Agreed, at 70kg I'm by no means heavy so I don't see this being too big of a problem. That said, this would be interesting to see through so I'll be keeping an eye on it for a while and if anything changes I'll report in for science. Thanks guys!
  
  – D Lucky
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  A good framebuilder could easily repair that, possibly without much damage to the paintjob.
  
  – Carel
  3 hours ago
  

  
  
  
  

add a comment | 

I think the key question is: how much strength is the elliptical plate brazed over the top of the seat stay adding to the strength of the joint? I'd guess it is adding some strength, as without it there is not much material between the main seat stay tube and the brazed joint. I'd be worried about a crack forming just below the joint which could lead to the stay detaching from the main triangle

However, if one stay detaches it likely won't be a catastrophic failure, because the other stay will still be supporting the rear triangle.

Really you need to consider the risk yourself. If you are a heavy rider who rides the bike hard there's more risk, obviously. At the very least I'd periodically inspect that area to check for any other cracks forming.

share|improve this answer

answered 7 hours ago

Argenti ApparatusArgenti Apparatus

44.2k33 gold badges4545 silver badges106106 bronze badges

share|improve this answer

answered 7 hours ago

Argenti ApparatusArgenti Apparatus

44.2k33 gold badges4545 silver badges106106 bronze badges

answered 7 hours ago

Argenti ApparatusArgenti Apparatus

44.2k33 gold badges4545 silver badges106106 bronze badges

answered 7 hours ago

Argenti ApparatusArgenti Apparatus

44.2k33 gold badges4545 silver badges106106 bronze badges

2

My guess is that when the frame was made the solder didn't flow into that gap completely and it's been this way since it was new covered over by paint.

If it gets worse over time it can be repaired.

If you don't feel comfortable with it you can get it repaired now.

Argenti is right, a worst case scenario is the seat stay detaching when you need it most.

Even if that happens you have other tubes to hold things together so the rear wheel won't fly off - you'll have time to slow down and get off the bike, so you might have to walk a long ways.

share|improve this answer

answered 4 hours ago

David DDavid D

3,46211 gold badge55 silver badges1919 bronze badges

add a comment | 

2

My guess is that when the frame was made the solder didn't flow into that gap completely and it's been this way since it was new covered over by paint.

If it gets worse over time it can be repaired.

If you don't feel comfortable with it you can get it repaired now.

Argenti is right, a worst case scenario is the seat stay detaching when you need it most.

Even if that happens you have other tubes to hold things together so the rear wheel won't fly off - you'll have time to slow down and get off the bike, so you might have to walk a long ways.

share|improve this answer

answered 4 hours ago

David DDavid D

3,46211 gold badge55 silver badges1919 bronze badges

add a comment | 

My guess is that when the frame was made the solder didn't flow into that gap completely and it's been this way since it was new covered over by paint.

If it gets worse over time it can be repaired.

If you don't feel comfortable with it you can get it repaired now.

Argenti is right, a worst case scenario is the seat stay detaching when you need it most.

Even if that happens you have other tubes to hold things together so the rear wheel won't fly off - you'll have time to slow down and get off the bike, so you might have to walk a long ways.

share|improve this answer

answered 4 hours ago

David DDavid D

3,46211 gold badge55 silver badges1919 bronze badges

share|improve this answer

answered 4 hours ago

David DDavid D

3,46211 gold badge55 silver badges1919 bronze badges

answered 4 hours ago

David DDavid D

3,46211 gold badge55 silver badges1919 bronze badges

answered 4 hours ago

David DDavid D

3,46211 gold badge55 silver badges1919 bronze badges