Really . . . I was Just Riding Along
04-17-08, 11:23 AM
#1
Electro-Forged
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Really . . . I was Just Riding Along
. . when this happened:
It happened when I was on a bike path, crossing a street. I unweighted the saddle, must have had all my weight on the bottom bracket. Bump exiting the crossing and back on the path, and the next thing I know, the back wheel is rubbing on the seat tube. I keep trying to replace my old 13 lb. ElectroForged frame, but its the one that never failed.
It happened when I was on a bike path, crossing a street. I unweighted the saddle, must have had all my weight on the bottom bracket. Bump exiting the crossing and back on the path, and the next thing I know, the back wheel is rubbing on the seat tube. I keep trying to replace my old 13 lb. ElectroForged frame, but its the one that never failed.
04-17-08, 11:28 AM
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Did that pull out? Looks like it. Is it steel? If it pulled out it was never brazed right in the first place. That should be easy to fix.
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04-17-08, 11:31 AM
#3
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Yes, the seat tube pulled out of the bottom bracket.
I have been mulling over whether to take it in for repairs, because re-brazing would also lead to a repaint and more $$ for an ebay-ed frame. I enjoyed riding that frame quite a bit, though, and it was making for a very fun commute.
Walter.
I have been mulling over whether to take it in for repairs, because re-brazing would also lead to a repaint and more $$ for an ebay-ed frame. I enjoyed riding that frame quite a bit, though, and it was making for a very fun commute.
Walter.
Last edited by walterk46; 04-17-08 at 11:46 AM.
04-17-08, 12:28 PM
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Do it your self, both the re-braze and the paint...not that hard.
04-17-08, 12:35 PM
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+1 on repairing it
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i jam my thumbs up and back into the tubes. this way i can point my fingers straight out in front to split the wind and attain an even more aero profile, and the usual fixed gear - zen - connectedness feeling through the drivetrain is multiplied ten fold because my thumbs become one with the tubing.
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04-17-08, 12:38 PM
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Is that bike a benotto cause there is a manufacturing defect in some models.
04-17-08, 01:03 PM
#10
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04-17-08, 01:29 PM
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JB Weld!
Or do it right.
Or do it right.
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04-17-08, 01:42 PM
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I had something similar happen with an old Univega... only with less pulling out and more breaking. Just gotta weigh the cost vs. benefit of fix/repaint vs. new frame or new bike. What's the frame?
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04-17-08, 02:02 PM
#13
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It is (was) one of the Greenville-made Schwinns, made with Columbus tubes and nice dropouts. So its better than a hi-ten steel gaspipe frame, but not a collector's item. Basically, just a nice riding frame.
04-17-08, 02:09 PM
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JB Weld will fix it so you will not damage your paint. Use a Dremel and abrasive wheel to get clean metal where the joints will be mated. You'll need to hold the tube in position while the JB Weld sets. A ratchet type hold down strap will do the job. Follow the directions on the package. JB Weld is wonderful stuff.
04-17-08, 02:26 PM
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Duct tape. It's even a close match to your frame colour.
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04-17-08, 02:43 PM
#16
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You can braze it with a MAPP torch, which you can pick up at Home Depot for $40 or so. MAPP burns significantly hotter than propane, so you get enough heat to do brazing, but it's much cheaper to buy a MAPP setup than an oxyacetylene torch set.
Remove the bottom bracket, then clean the outside of the tube and the inside of the lug well with sandpaper (all rust and contaminants must be removed), put the tube back in the lug, heat it to glowing red with the torch, and feed in some pre-fluxed brass brazing rod (also available at Home Depot, more than likely). Let it cool, then repaint it. Save yourself some work by sanding the paint back 2-3" from the joint - if you burn the paint with the torch it becomes really, really difficult to get off later.
It won't be as strong as a joint brazed by a craftsman who uses a silver-bearing alloy as a filler and knows how to control the heat so the filler metal flows properly but the steel doesn't get too hot, but it'll be stronger than the original poorly-brazed joint. I've put a lot of miles on an old, cheap frame that I bought in college - I stripped the paint, moved most of the braze-ons around to suit what I wanted on it, then had an artist friend repaint it with an airbrush and some epoxy paint. It's held up really well.
Remove the bottom bracket, then clean the outside of the tube and the inside of the lug well with sandpaper (all rust and contaminants must be removed), put the tube back in the lug, heat it to glowing red with the torch, and feed in some pre-fluxed brass brazing rod (also available at Home Depot, more than likely). Let it cool, then repaint it. Save yourself some work by sanding the paint back 2-3" from the joint - if you burn the paint with the torch it becomes really, really difficult to get off later.
It won't be as strong as a joint brazed by a craftsman who uses a silver-bearing alloy as a filler and knows how to control the heat so the filler metal flows properly but the steel doesn't get too hot, but it'll be stronger than the original poorly-brazed joint. I've put a lot of miles on an old, cheap frame that I bought in college - I stripped the paint, moved most of the braze-ons around to suit what I wanted on it, then had an artist friend repaint it with an airbrush and some epoxy paint. It's held up really well.
04-17-08, 03:10 PM
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Doesn't seem worth it, especially if I got to wondering if any of the other connections were compromised.
04-17-08, 04:30 PM
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MAPP FTW. Then you can put "frame builder" in your sig...
04-17-08, 06:05 PM
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As a mechanical engineer, I can tell you, JB weld is a very bad idea. It's very susceptible to fatigue through micro-fractures of the granular structure of the epoxy compound. The joint itself is the source of structural rigidity, not the adhering compound. What you need is something that will hold fast and be resilient without developing microfractures that will lead it to fail later on, something more viscoelastic than JB weld. I recommend a product such as this:
04-17-08, 06:21 PM
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Like hell!
Do you even read your own posts? They failed to weld the bottom bracket! You would be mad to ride that frame another foot! It was probably stolen out of the factory's dumpster.
My advice is to sell it to someone who recommended fixing it. What would you pay for it ItsJustMe? How about an offer, tate65, 04jtb?
Put the frame down and step away from it. Be thankful no one was hurt.
