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Ding removal

Old 10-25-13, 01:07 PM
  #1  
rjhammett
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Ding removal

One of my bikes has a ding on the top tube. Has anyone had a body shop do the hail dent removal process on a ding on a bike? Obviously the steel of the top tube is thicker than a car's body panels but wondering if it would work. Any diy tricks to remove dings?
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Old 10-25-13, 01:29 PM
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You mean drilling a hole in the dent and pulling it up hooking through that hole ,
adding Bondo and sanding it smooth, kind of body shop?
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Old 10-25-13, 01:40 PM
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That kind of auto body shop but not that method. Supposedly hail dents can be removed without any of that monkey business. According to the tv commercials it is like magic.

Originally Posted by fietsbob View Post
You mean drilling a hole in the dent and pulling it up hooking through that hole ,
adding Bondo and sanding it smooth, kind of body shop?
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Old 10-25-13, 01:42 PM
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good luck


got an industrial-strength Vacuum pump?

some pro level DB tube , in the center its thinner than auto bodies are stamped out of.
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Old 10-25-13, 02:03 PM
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Originally Posted by fietsbob View Post
...got an industrial-strength Vacuum pump?....
Funny. However, no matter how good the vacuum pump, it can't provide any more force than that of ambient pressure.
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Old 10-25-13, 02:07 PM
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the ambient pressure is the force on the inside that you would rely on pushing out ,
you are just trying to increase the differential. amount.
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Old 10-25-13, 02:23 PM
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I should have taken another semester of Physics in college so I would know what you are talking about.
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Old 10-25-13, 02:39 PM
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As the owner of a 'dinged' LHT I would love to hear any successful DIY methods. Keep the comments coming

Last edited by toolboy; 10-25-13 at 02:39 PM. Reason: spelling
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Old 10-25-13, 02:39 PM
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I remember hearing a long time ago
that dents can be pushed out by pressurizing a tube with hydraulic fluid

some combination of pushing from the inside and pulling from the outside
would do the trick

although i usually leave dents and such alone
i am proud of the battle scars
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Old 10-25-13, 03:08 PM
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http://www.bikeforums.net/showthread...ht=dent+repair
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Old 10-25-13, 03:55 PM
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Someone from this forum has to have tried this:

http://www.harborfreight.com/crossba...kit-66957.html
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Old 10-25-13, 04:13 PM
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Originally Posted by fietsbob View Post
the ambient pressure is the force on the inside that you would rely on pushing out ,
you are just trying to increase the differential. amount.
True, but 15psi isn't going to move a steel tube wall. The only way to push the dent out is by "hydroforming" where oil is pumped in at extremely high pressure to push it out. This would also need for the rest of the tube to be constrained within a split 1" ID cyclinder, so the only place that can move is the dent.
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Old 10-25-13, 04:18 PM
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The way to remove dents from steel frames is with a pair frame blocks with a 1" (or whatever tube is) bore right down the split. The blocks are placed in a vise and closed against the bulged ends of the dent while the frame is rotated to massage the dent out. This rarely gets it perfect, so some body filler is used to finish, then some kind of camouflage, like a decal, or trim tape is applied.

Years ago a friend and I undented his high end Italian frame, and managed to get it barely visible. Then my friend wanted to hide the last vestige so he got someone to make him a foil decal clearly printed "ex-dent".
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Last edited by FBinNY; 10-25-13 at 04:22 PM.
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Old 10-25-13, 04:29 PM
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I know how you feel, every time you see your bike your eyes are attracted to the dent. If the dent has not compromised the tube, sand to bare metal, fill with bondo, sand, prime, and paint. I've done it on a few bikes, you no longer see the dent, out of sight out of mind!!
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Old 10-25-13, 04:32 PM
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you might check with a good paintless dent guy.
they have tabs that they glue on the dented area. then attach a slide hammer to the tab. then pull the dent out that way.
it works on thin sheet metal. but a bicycle frame is much thicker. i don't know if it will work.
body shops have a tool to weld studs in the dented area and pull the dents out with the studs. the frame must be steel to do this. again bicycle frames are thicker than sheet metal so i don't know how good it will work.
you could use a little heat to help the dent pull out. but i don't know how good it would work.
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Old 10-25-13, 04:37 PM
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Originally Posted by rjhammett View Post
Someone from this forum has to have tried this:

http://www.harborfreight.com/crossba...kit-66957.html
I have, but not on a bike. Mine was called "Ding King". It took the dents and turned them into pimples.
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Old 10-25-13, 04:42 PM
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just know the dent includes some stretching.. and some ovalizing , frame blocks will press the oval back to round,

but not compress the stretched part of the bend..
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Old 10-25-13, 06:42 PM
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Originally Posted by fietsbob View Post
just know the dent includes some stretching.. and some ovalizing , frame blocks will press the oval back to round, but not compress the stretched part of the bend..
Just filling the dent may leave a crease that will be noticeable after paint. This is due to the slight ovalizing as fietsbob describes. Frame blocks work reasonably well getting the tube back into round and will shrink the dent a bit. I use autobody lead (60-70% lead, rest tin) or occasionally brazing metal to fill in what's left. I reckon you could use bondo but I have never been a fan.
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Old 10-25-13, 08:05 PM
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Originally Posted by mrt2you View Post
you might check with a good paintless dent guy.
they have tabs that they glue on the dented area. then attach a slide hammer to the tab. then pull the dent out that way.
it works on thin sheet metal. but a bicycle frame is much thicker. i don't know if it will work.
body shops have a tool to weld studs in the dented area and pull the dents out with the studs. the frame must be steel to do this. again bicycle frames are thicker than sheet metal so i don't know how good it will work.
you could use a little heat to help the dent pull out. but i don't know how good it would work.
There's a somewhat similar bodyworking trick to pull dents. Using a special arc welder, a two-inch piece of rod is tack-welded onto the dent, and then a slide hammer is chucked onto that piece of rod to pull the dent. Once the dent is pulled out, the rod is snipped off and the surface ground smooth. Again, though, that's sheet metal that's being pulled, not semi-heavy tube.
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Old 10-25-13, 08:15 PM
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There is a way to "iron' dents out of tubing but it's not really useful for bike tubes except perhaps the head tube or seat tube. A steel mandrel is turned to the ID of the tube and forced through the inside thus pushing out the dent. This is commonly used to remove dents in shotgun barrels which are relatively thin walled although much thicker than bike tubing.
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Old 10-25-13, 09:48 PM
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If you scrll down this forum just a bit you will find this post which should be helpful

http://www.bikeforums.net/showthread...rom-bike-tubes
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Old 10-25-13, 09:58 PM
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I just had my bike painted. Had it done at a rural body shop down the road from me that's scarcely even in business anymore. I think they just do an occasional auto restoration job.

Had a dent in the top tube which I did not expect them to repair. But I picked it up the other day and the dent was gone. I sure can't see any trace that might indicate they used bondo to fill it, but I really have no idea what they did. Looks perfect though, so it certainly can be done.
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