Cracked Lynskey Cooper
#1
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.
(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.
#2
Team Beer
Join Date: Apr 2004
Location: Sacramento CA
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Return to seller and get refund
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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
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
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#4
Randomhead
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I am wondering if those are just defective chainstays. Welding would probably work. I'm not sure I could trust it though
#5
Senior Member
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.
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#6
Randomhead
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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.
#7
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.
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#8
Senior Member
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.
#9
Randomhead
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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.
#10
Senior Member
Ouch.
I take seller denies all.
I take seller denies all.
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