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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 02-27-17, 02:03 PM   #1
TothSzalayGabor
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Strange crack at seattube. Buy or not?

Hi!

I just found a good old track frame for fair price. I met the guy, and i started to measure, see if the tubes are straight, and then I noticed a very strange crack. The guy told me, when he bought the frame, the seatpost was smaller than the right size, and at a local shop they reopened the clamp (there is also a small crack at the clamp, but thats not a big deal, 30-40 years old frame...)
The guy told me, after he bought and fix the clamp, went to respray it, and he used this frame for 4 years.

SO; At the first sight, I was thinking, that this is just a painting fail



NO, this is a Hole? Crack? or something like that in the frame.




This is a pretty heavy, strong frame, looks like never crashed, tubes are straight, lug angles are good. Sould I repair first if I buy it, or can i ride it safe? this thing looks like not changed after the last repaint (4 years)
I dont want to change the whole tube, I want to change my present frame because i discovered a lug crack, but that is a 531C frame with very thin tubes.

What could cause this failure??? I can't picture what happened here. Is that safe to ride?

Thanks for the replies
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Old 02-27-17, 02:56 PM   #2
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To me it looks like someone may have tried to force a too large seat post in there. Safe? I dunno.
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Old 02-27-17, 06:49 PM   #3
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Idk... kinda feel like why buy a cracked frame when there are many non-cracked ones out there? Then again, and I could be wrong, but even if it split another inch down the tube while riding seated (which I'd think is unlikely, as you're not putting stress on the exact spot of the crack in that scenario), it seems like the worst thing that could happen is your seat post gets a little flexy and you ride home standing up while thinking about what your next frame purchase will be.

I guess it depends on just how good that deal is and how risk averse (or not) you are.
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Old 02-27-17, 06:58 PM   #4
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From those pictures, it looks like there are way too many coats of thick paint. If I really wanted the frame and it were a good deal, I'd probably buy it, have it stripped, assess the crack better and consider having it welded, then start over with a new paint job.

...that's if it's a really good deal. My general rule is: don't buy broken (cracked) bikes.

But that's just me. You should do whatever's right for you.
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Old 02-28-17, 01:56 AM   #5
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Steel can be repair, no problems

Everything is about how much deal, if its light on your money pocket, do it (calculate repair costs too)

Just my opinion alone
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Old 02-28-17, 10:26 AM   #6
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That looks like an effed up frame where the seat lug ID is larger than the seatube ID. No way I'd want anything to do with such a POS.
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Old 02-28-17, 12:00 PM   #7
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Originally Posted by j_e_r_e_m_y View Post
Idk... kinda feel like why buy a cracked frame when there are many non-cracked ones out there? Then again, and I could be wrong, but even if it split another inch down the tube while riding seated (which I'd think is unlikely, as you're not putting stress on the exact spot of the crack in that scenario), it seems like the worst thing that could happen is your seat post gets a little flexy and you ride home standing up while thinking about what your next frame purchase will be.

I guess it depends on just how good that deal is and how risk averse (or not) you are.
Have to agree. Unless this is a dream frame for you and you just cannot find another one in your size, then why bother? You buy a frame that is sketch, and sometimes a "good deal" turns out to be not such a good deal, you know?
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Old 02-28-17, 03:53 PM   #8
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Steel can be repair, no problems
It isn't so simple. If this is another 531 frame, as OP already has a cracked 531 frame, a repair would mean replacing the tube because is should be brazed instead of welded. That makes this a lot more expensive.
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Old 02-28-17, 09:04 PM   #9
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Is the hole big enough to route a brake cable through? Drill another one in the head tube and you've got internal cable routing.
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Old 02-28-17, 09:29 PM   #10
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pass
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Old 02-28-17, 09:47 PM   #11
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Yea, i'd pass on this as well unless this frame is a super uber rare frame or something. Plenty of other frames out there that aren't messed up!
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Old 02-28-17, 10:24 PM   #12
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I'm not quite sure what would have caused that. Maybe having a fluted seatpost installed way to deep, and getting a pebble down in the flutes, then twisting HARD?

Do you have a brand for the frame? What caught your eye about it?

I have a mixed opinion. If it was my own bike, I might braze it, or ride it as is.

I'd probably select a seatpost that would extend a few inches below the damaged area. Make sure a standard seatpost fits.

Buying it? I'm not sure. I enjoy "projects", but expect them to be CHEAP.
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Old 03-01-17, 09:26 AM   #13
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Grind the paint off to assess the damage, prep and weld. You'd most likely have to peen the area down a bit, but it's a minor repair that any fab shop or local weldor could fix for cheap.

It's a bicycle frame, not a pressure vessel.
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Old 03-01-17, 08:37 PM   #14
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Nothing good about a cracked frame. Steel can be repaired but is the cost worth it. If it were a custom frame built by a well known builder or was very rare and worth something sure, if I was on tour and wanted to finish the tour on that bike or I had welding equipment and skills to weld, sure but aside from that probably not.
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Old 03-06-17, 09:21 AM   #15
TothSzalayGabor
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tanks for the replies! i'll show it tomorrow to a local framebuilder, he said after seeing the pictures its not so bad, can be repaired without tube change. he'll check it and if he'll say the same, i'll buy it
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