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Opinions on this frame damage

Old 04-26-08, 09:02 PM
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bct555
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Opinions on this frame damage

I picked up an old giant AT710 bike a few weeks ago and in the process of getting it ready for CL noticed a small hairline in the seat tube. The crack is about 1.25" long and is down about 1.5-2" below the top of the seat tube. Would you feel safe riding this bike? It's got about 4-5" of stem in the seat post.

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Old 04-26-08, 09:13 PM
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AL or steel?

-Kurt
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Old 04-26-08, 09:25 PM
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Odd place for a crack to develop.

Since the seatpost extends below the crack, there should not be any immediate problem riding it, BUT.....

Giant frames carry a lifetime warranty. Any Giant dealer should be able to get you a replacement, providing this is a natually occuring crack. You would probably be on the hook for the labor.

A straight crack in this location indicates that the tube is rolled(vs drawn) and that there may be a bigger crack in your future.
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Old 04-26-08, 09:33 PM
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Could it have been that an aluminum post was extracted from this frame via the Sawzall method?

-Kurt
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Old 04-26-08, 10:48 PM
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Originally Posted by cudak888 View Post
Could it have been that an aluminum post was extracted from this frame via the Sawzall method?

-Kurt
I can just picture that! HA!
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Old 04-26-08, 11:48 PM
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That is some butt ugly welding right there.
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Old 04-26-08, 11:53 PM
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Looks like automated welding of sorts - tubes are mitered, frame is assembled in a jig with fixed torches, and discs of the bonding metal of choice are inserted into the tubes, to ultimately melt into the gap when all is said and done. Disgusting and cheap way of doing it.

-Kurt
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Old 04-27-08, 06:14 AM
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Sorry for the late reply but the sandman comes a little sooner nowdays.

It's a steel frame and doesn't show any sign of having any internal damage such as a saw might cause removing a seat post.
I think it's an early 80's bike and just wanted to make sure it wasn't certain disaster to be riding it. I may check with one of the local giant dealers and see what they say.

You think the welds are ugly then you'll run away in horror at seeing the whole bike. You were warned

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Old 04-27-08, 06:19 AM
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I wouldn't sell a bike that has that kind of defect on CL unless if was fully disclosed to the buyer.
As for the bike being an early 80's model, I don't think Giant sold their own label until the very late 80's (maybe very early 90's), someone else may want to comment on that.
As for possibly getting a new frame, I'd run, not walk to the nearest Giant dealer to find out I could trade it.
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Old 04-27-08, 06:28 AM
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Oh yeah, It would definitely be disclosed to the buyer. I was just guessing on the age so I'm most likely way off.
It's a cheap bike and the kind a lot of the local students want to get around campus but I doubt they would keep an eye on the crack for any future damage so probably be better to just scrap the frame if warranty wont cover it
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Old 04-27-08, 09:48 AM
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Originally Posted by 100bikes View Post
Giant frames carry a lifetime warranty. Any Giant dealer should be able to get you a replacement, providing this is a natually occuring crack. You would probably be on the hook for the labor.
True but, lifetime for the original purchaser and they usualy only give you an 'equivelant' replacement. You can bet Giant doesnt have anything close to that so they'll hit you with an 'upgrade' fee along with possible labor charges. On top of that you know the seatpost, stem, fork and headset will not fit. Add more $$.
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Old 04-27-08, 09:57 AM
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Originally Posted by bct555 View Post
You think the welds are ugly then you'll run away in horror at seeing the whole bike. You were warned
One of those Jamis Boss Cruiser wanna-bee's. I never understood why they're so damn popular. Folks will dump $80 bucks for them without a second thought...

-Kurt
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Old 04-27-08, 09:59 AM
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Originally Posted by bct555 View Post
Would you feel safe riding this bike?
No.
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Old 04-27-08, 10:02 AM
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Originally Posted by bct555 View Post
You think the welds are ugly then you'll run away in horror at seeing the whole bike. You were warned

I dunno, I think that would make a great city bike. That crack would be a deal-breaker for me, though.
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Old 04-27-08, 11:04 AM
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Originally Posted by 100bikes View Post
A straight crack in this location indicates that the tube is rolled(vs drawn) and that there may be a bigger crack in your future.
In my limited experience, bikes having seamed tubing have the seam on the rear, not on the side.

If OP is just concerned about utility, then a competent welder could address the crack, and it would probably be fine. Failure would probably be gradual, especially with seatpost extending below the crack.

I know little about MTBs; is that a shock-absorbing seatpost? Could the action of that thing have contributed to the crack? If so, mebbe using a plain seatpost would help.
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Old 04-27-08, 11:35 AM
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I think someone may have tightened down on a seatpost that was too small for the bike to put the kind of stress it would take to make a crack like that, where it's at. But if not that, then I'd feel a bit insequre about the quality of the steel because I can't think of anything else that would cause it other than freezing the area with some liquid hydrogen and smacking it with a rawhide mallet.
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