Go Back  Bike Forums > Bike Forums > Framebuilders
Reload this Page >

Cracked Lynskey Cooper

Notices
Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

Cracked Lynskey Cooper

Old 08-23-23, 01:38 AM
  #1  
Jockie
Newbie
Thread Starter
 
Join Date: Jul 2010
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 6 Times in 4 Posts
Cracked Lynskey Cooper

I found two cracks in a second-hand Lynskey Cooper I just acquired on an online auction.
(Cracks were not mentioned in the listing!)
Larger crack is on the outside of the DS chainstay and smaller one is on the underside of the NDS chainstay.
Do these look repairable to framebuilders?
Sending back to Tennessee is going to be expensive from here. There is a local who appears to have experience repairing titanium bicycle frames.

Jockie is offline  
Old 08-23-23, 01:52 PM
  #2  
Cynikal 
Team Beer
 
Cynikal's Avatar
 
Join Date: Apr 2004
Location: Sacramento CA
Posts: 6,338

Bikes: Too Many

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 113 Post(s)
Liked 157 Times in 103 Posts
Return to seller and get refund
__________________
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
Cynikal is offline  
Likes For Cynikal:
Old 08-23-23, 04:16 PM
  #3  
Jockie
Newbie
Thread Starter
 
Join Date: Jul 2010
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 6 Times in 4 Posts
Unfortunately, that is not possible.
Jockie is offline  
Old 08-23-23, 06:04 PM
  #4  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,275
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,588 Times in 2,452 Posts
I am wondering if those are just defective chainstays. Welding would probably work. I'm not sure I could trust it though
unterhausen is offline  
Old 08-24-23, 01:26 PM
  #5  
GrayJay
Senior Member
 
GrayJay's Avatar
 
Join Date: Sep 2009
Location: EagleRiver AK
Posts: 1,303
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Likes: 0
Liked 59 Times in 32 Posts
Strange looking cracks. If this were a stress crack from use/fatigue then it would more likely run radial around the tube, instead of along the tube axis length. Might be that the seatstay tubing was formed from sheets that were then welded into a tube along a seam and that is what is now re-cracking? Given that the seatstays stress is mostly in compression, the direction of the crack probably does not greatly affect the strength of the seatstay. Laying down a TIG bead along the crack and then grinding smooth would likely be worth trying.
GrayJay is offline  
Likes For GrayJay:
Old 08-24-23, 01:56 PM
  #6  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,275
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,588 Times in 2,452 Posts
That's what I was thinking, they are welded tubing that was drawn after welding. Which I think is how it works. That would explain the somewhat random cracking. Although the crack would probably veer back and forth from one edge of the heat affected zone to the other. It's not the first time I have seen cracking like this.
unterhausen is offline  
Old 08-24-23, 09:39 PM
  #7  
Kabuto
Full Member
 
Kabuto's Avatar
 
Join Date: Jul 2017
Location: Far East
Posts: 264
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 168 Post(s)
Liked 75 Times in 51 Posts
Originally Posted by Jockie
I found two cracks in a second-hand Lynskey Cooper I just acquired on an online auction.
(Cracks were not mentioned in the listing!)
Online auction means Yahoo Japan auctions (or Mercari)? If so, its a bit of a hassle to sort out but you can definitely return the frame even if the listing stated "no returns". Especially so considering the cracks that weren't mentioned in the listing. Yahoo Japan (Mercari) will take your side on this one for sure.
Kabuto is offline  
Likes For Kabuto:
Old 08-26-23, 02:44 PM
  #8  
guy153
Senior Member
 
Join Date: Dec 2019
Posts: 938
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 319 Post(s)
Liked 258 Times in 209 Posts
Originally Posted by unterhausen
That's what I was thinking, they are welded tubing that was drawn after welding. Which I think is how it works. That would explain the somewhat random cracking. Although the crack would probably veer back and forth from one edge of the heat affected zone to the other. It's not the first time I have seen cracking like this.
Or there could have been some debris or imperfection in the die they were drawn through maybe? That would apply even if they were seamless. Idk how Ti tubes are usually made.
guy153 is offline  
Old 08-27-23, 09:32 AM
  #9  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,275
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,588 Times in 2,452 Posts
I don't know how Ti welded tubes are made, but the steel tubes I have seen that were drawn over a bad die just cracked in a straight line. I have never seen a picture of how the true temper tubing cracked in the early days, that would be interesting. Of course, steel tubes might also fail due to rust if they have a crease inside. Definitely pays to look inside your tubes before building. And measure seat tube internal diameters.
unterhausen is offline  
Old 08-27-23, 05:37 PM
  #10  
repechage
Senior Member
 
Join Date: Jun 2006
Posts: 20,282
Mentioned: 129 Post(s)
Tagged: 0 Thread(s)
Quoted: 3433 Post(s)
Liked 2,772 Times in 1,955 Posts
Ouch.

I take seller denies all.
repechage is offline  
Likes For repechage:
Old 08-27-23, 07:03 PM
  #11  
Jockie
Newbie
Thread Starter
 
Join Date: Jul 2010
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 6 Times in 4 Posts
The seller claims that 'scratched and dirty' is an accurate description.
The original manufacturer has suggested a repair would involve complete replacement of the chainstays.
Jockie is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.