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Aluminium Frame Cracks?

Old 08-22-21, 05:54 PM
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hihi2u2
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Aluminium Frame Cracks?

I think I just bought a frame that is full of cracks (only discovered after I started to strip the bike down to the frame for polishing)? Was going to buy it as a restoration project and learn the ropes of bike maintenance.

Are these cracks, if so I'm guessing I should stop and not waste my time.





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Old 08-22-21, 06:34 PM
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Stop wasting your time.
That bike was loved just a little too much.
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Old 08-22-21, 07:23 PM
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I don't know how many of the possible cracks really are but I hope you didn't pay much for this frame. The one that I would be concerned about is the fork's. The snaking shape of the possible crack is not the usual shape of how stress radiates along a tube. But a fork failure that happens quickly is a really bad experience The rest have a lot less safety concerns, IMO. The frame needs a serious and well done paint stripping to truly assess the bad spots. There are dye penetrants that might be used to find out in the bad spots are real cracks. Andy
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Old 08-22-21, 07:57 PM
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Didn't a shop already tell you the frame is cracked? Building Classic Bianchi with modern parts
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Old 08-22-21, 08:00 PM
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Fork one is certainly scary. The others on the frame are very odd, looks more like corrosion to me.
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Old 08-23-21, 02:05 AM
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Shops

Originally Posted by shelbyfv View Post
Didn't a shop already tell you the frame is cracked? Building Classic Bianchi with modern parts
Yea it was a quick look when I took it in for the seized crank and CLA on the mech. Just hoped to get a second opinion, for the fork I've bought a replacement Bianchi full carbon one. Really like the bike, dam frame. Just have to wait for the PayPal dispute to lapse.
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Old 08-23-21, 04:37 AM
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Originally Posted by Andrew R Stewart View Post
I don't know how many of the possible cracks really are but I hope you didn't pay much for this frame. The one that I would be concerned about is the fork's. The snaking shape of the possible crack is not the usual shape of how stress radiates along a tube. But a fork failure that happens quickly is a really bad experience The rest have a lot less safety concerns, IMO. The frame needs a serious and well done paint stripping to truly assess the bad spots. There are dye penetrants that might be used to find out in the bad spots are real cracks. Andy
This. You gotta determine whether they are cracks or paint damage. It needs stripping and testing. Strip those areas first. So you don't put any extra time in it.
Plenty of these frames about. So is it worth it?

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Old 08-23-21, 08:12 AM
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Hope your time investment is worth as little as this frame. In my view only the apparent crack in the seat stay above
the brake bridge is likely to be a true crack but considering the paint may be a paint crack only. The bottom bracket
stuff is likely grunge in the welding crevices and bad paint. Only full strip will tell which if done by hand is a PITA to
do in my experience and not inexpensive if supplies are bought retail. You have already dealt with the fork.

Wonder what those two "bubbles" seen on the inside of the bottom bracket shell are?
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Old 08-24-21, 01:20 AM
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Originally Posted by blamester View Post
This. You gotta determine whether they are cracks or paint damage. It needs stripping and testing. Strip those areas first. So you don't put any extra time in it.
Plenty of these frames about. So is it worth it?
Yea that's the question is it worth it, when you start to strip the paint it's gonna be a repaint if the frame is ok. Paid way too much for the bike, cost me £250 and probably not worth spending more on it. Need PayPal dispute to pull through .... ...
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Old 08-24-21, 01:53 AM
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Originally Posted by blamester View Post
This. You gotta determine whether they are cracks or paint damage. It needs stripping and testing. Strip those areas first. So you don't put any extra time in it.
Plenty of these frames about. So is it worth it?
Yea that's the question is it worth it, when you start to strip the paint it's gonna be a repaint if the frame is ok. Paid way too much for the bike, cost me £250 and probably not worth spending more on it. Need PayPal dispute to pull through .... ...
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Old 08-24-21, 11:20 AM
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Originally Posted by hihi2u2 View Post
Yea that's the question is it worth it, when you start to strip the paint it's gonna be a repaint if the frame is ok. Paid way too much for the bike, cost me £250 and probably not worth spending more on it. Need PayPal dispute to pull through .... ...
There are so many problems with that frame that you don’t need to strip paint. Welds should not have cracks in the paint that follow the contours of the weld. The fact that the paint cracks follow the weld contours says that the welds are bad…all of them on the frame! The weld is flexing under the paint which shouldn’t happen.

The brake bridge has almost crumbled to dust and is more aluminum oxide than “aluminum”. The red arrows point to pits in the metal which shouldn’t exist. This frame has probably been exposed to lots of salt, either road salt or being stored in an ocean environment.


As others have said, stop wasting your time. The bike is about one ride away from collapsing into a pile of white powder.
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Old 08-24-21, 10:45 PM
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You are showing good judgement.
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Old 08-25-21, 08:08 AM
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If you're junking the frame make sure you recycle the aluminum as it can be 100% melted down and re-used.
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Old 08-25-21, 12:07 PM
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Originally Posted by Crankycrank View Post
If you're junking the frame make sure you recycle the aluminum as it can be 100% melted down and re-used.
Thanks for the reminder, will do that after the Paypal dispute has lapsed. Expensive lesson learnt :-)
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Old 09-04-21, 02:04 PM
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Well, the PayPal dispute has lapsed and I've managed to get a partial refund back. Out of interest, I've cleaned the frame to see what it looks like under the paint. Just for those who might be interested :- D



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Old 09-04-21, 08:28 PM
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Useful tip to anyone if you are not confident in the frame, don't ride it. Unless you have someone knowledgable in frame building or repair looking over it and giving you assurances it is safe and would put it into writing, I wouldn't bother. You already have doubt in your mind that is already a good sign to not continue. If you really loved the frame put it up as a wall hanger or find a way to recycle it or if steel, see if a competent frame builder can restore it if worth it.
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