Little chunk taken out of frame ?

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6/13/2015 10:46 AM

OK so I haven't rode my bike in a week and I looked at it today and on the drive side chainstay there is a pretty good little chunk of metal that must have gotten taken from the frame on a really brutal grind. Now I'm not sure if this is bad or not its only about 1/2 cm long and maybe a fingernails with deep, any thoughts?Photo

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6/13/2015 11:45 AM

Not much you can do about it, also not really a big deal.

If it does crack all the way through, hit up United for a warranty. Always worth seeing if they can help out.

http://unitedbikeco.com/pages/warranty

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Chris

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6/13/2015 11:49 AM

Looks like some small cosmetic damage

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6/13/2015 12:04 PM

Shits ready to explode. Chance of death is high.

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6/13/2015 3:41 PM

Band- Aid! !!

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F¬ Bom 5403692331

6/13/2015 4:24 PM

Bondo and/or duct tape. Those 2 fix everything

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I'm on the vital legit list!

6/13/2015 6:24 PM

tomdon wrote:

Bondo and/or duct tape. Those 2 fix everything

Bondo might work then just tape over it

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6/13/2015 6:26 PM

should be fine

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BORN FAST ish

6/13/2015 7:24 PM
Edited Date/Time: 6/16/2015 8:54 AM

Jib weld anyone? (Sarcasm)

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6/13/2015 10:11 PM

Color it with a black sharpie marker. Forget it ever existed.

In all honesty, it's just going to bug the shit outta you because you know it's there. I cracked the weld between the seattube and bottom bracket on an old frame on mine, it was tiny. It held up never and never got worse, had that bike for years afterward and beat the piss out of it. I looked at that stupid crack every days. It drove me up the wall.

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6/13/2015 11:16 PM

The tubing there is quite fat, and for cause. It is near to the bottom bracket, and that is a place where about 45% of the stress occurs. Your chunk thing looks fine for the moment, but it could develop small microscopic cracks that will take it's toll over time. An ultralight once blew off it's landing gear because of the same thing.

But here you enemy is corrosion: if rust gets in there and starts eating your frame, you can start looking at other frames.

The best thing to do would be to weld a small rectangular piece of metal on that, just long enough so that it transfers the stress from one end to another and skipping the hole.

Or, you could just paint over it, forget, and see how long it lasts.

Better still, forget about it and go ride.

CHeers.

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It doesn't matter where a train goes. It's decidin' to get on that does.

6/13/2015 11:35 PM

The worst thing you could do to that is weld it... Right next to welds are the weakest points on any frame. It and mess up any type of post weld heat treating. Because welding heats up what wever your welding.... And the hot doesn't stay put, it kind of transferres througout whatever your blasting with the welding rod.

Ducttape over it=good
electrical tape=good
paint=good
fingernail polish=good

Weld=bad

Bubblegum over it=better then weld.
Doing nothing=better then the bubble gum.

Ride it till it breaks= what I'd do.

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6/13/2015 11:58 PM

oops. My bad. Forgot about that post-weld treatment.

Still, does a few millimeters of sticky plastic actually do something?

What about getting a thin plate (but not too thin), wrap it around the area, and epoxy the thing?

I mean, epoxy is stronger than bubblegum, better than tape, and stronger than paint...

It's like a broken bone that we're trying to cradle...

Hey, if you don't want to spend your green tickets on epoxy and metal, just ride it, man. BMXes are supposed to be strong as f*ck and if it breaks just go yell in front of the United Bike Co. HQ. XD

PS: I am not trying to push you down or whatever,Nwewinit, just trying to get this guy up and going smile

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It doesn't matter where a train goes. It's decidin' to get on that does.

6/14/2015 12:15 AM

Skylight wrote:

oops. My bad. Forgot about that post-weld treatment.

Still, does a few millimeters of sticky plastic actually do something?

What about getting a thin plate (but not too thin), wrap it around the area, and epoxy the thing?

I mean, epoxy is stronger than bubblegum, better than tape, and stronger than paint...

It's like a broken bone that we're trying to cradle...

Hey, if you don't want to spend your green tickets on epoxy and metal, just ride it, man. BMXes are supposed to be strong as f*ck and if it breaks just go yell in front of the United Bike Co. HQ. XD

PS: I am not trying to push you down or whatever,Nwewinit, just trying to get this guy up and going smile

I'm not offended, don't worry about it.

Imagine this: you break your leg, go home, and put a band aid on it.

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6/14/2015 12:33 AM

Nwewinit wrote:

I'm not offended, don't worry about it.

Imagine this: you break your leg, go home, and put a band aid on it.

It only added half my post.. So i screenshot my whole comment Photo

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6/14/2015 1:19 AM

Tis but a scratch.

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6/14/2015 1:56 AM

Minor scratch ....search up
Sunnyjomofo ....you don't want to
Be like that guy .....ride it till it explodes like a man

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6/14/2015 3:16 AM

Nwewinit wrote:

The worst thing you could do to that is weld it... Right next to welds are the weakest points on any frame. It and mess up any type of post weld heat treating. Because welding heats up what wever your welding.... And the hot doesn't stay put, it kind of transferres througout whatever your blasting with the welding rod.

Ducttape over it=good
electrical tape=good
paint=good
fingernail polish=good

Weld=bad

Bubblegum over it=better then weld.
Doing nothing=better then the bubble gum.

Ride it till it breaks= what I'd do.

You are correct about that. I actually do a lot of welding as a hobby and the only thing I would do to that is maybe lay the worlds smallest bead in there grind over it and call it a day. Another problem with people just welding their frames is its not steel its chromoly (like steel but stronger and lighter but harder to mig weld) . So like you said it would look like shit on a mig welder that is. If I was really going to ever weld my frame I would set up a tig welder with a very small tungsten electrode maybe 30-50 amps and play around with what polarity to run (DC-,DC+ etc)

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6/14/2015 3:53 AM

And what about metal epoxy, then?

It won't do much for strength but would rather be better than paint and more for cosmetics...Have a flush chainstay instead of a scratched one...

Just sayin'

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It doesn't matter where a train goes. It's decidin' to get on that does.

6/14/2015 5:14 AM

Fuck Seth Kimbrough used to ride with like full blown dents on the stay..
+1 to covering the bare metal with something though... even some clear coat if you're not comfortable with paint cans near your bike's finish

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Muthafuckas betta know

6/14/2015 11:30 AM

Anyone ever suggesting repairing a crmo bmx bike frame via welding, is not a good welder. Don't do it.

"Normal(untreated)" CrMo can be re-welded twice.

Pre and post treated CrMO.. Thats a different story all together. The weld and next to the weld become the critical area of concern.

Heat-treatment in a nutshell: CrMo is heated up to 1600 degrees F, then quenched or cooled rapidly, when it's heat that high. It changes the molecular structure of the alloy, when it is quenched rapidly, it "locks" that structure in place. In this form CrMo has been stressed, and is brittle.. A.K.A. It can shatter like glass.

THEN the heat treated CrMo is tempered (heated up to ~1000 degrees F) and allowed to cool, changing the molecular structure once again, causing it to be less brittle.
(These two temperatures are variable, usually proprietary, and what distinguishes one manufacturer and frame from the other)

welding on treated CrMo does a few critical things.

1.) it ADDS more carbon to the CrMo alloy, depending on which welding rod is used. Changing the composition of the material ON THE WELD.

2.) welding creates what you call a "heat affected area" the length of time welding without allowing it to cool, and the thickness of the material effect this. THIS CHANGES THE MOLECULAR STRUCTURE of the alloy.

CrMo oxidizes at different colors depending on the temperature the metal has been heated up too. (Those are all the pretty oil slick colors near the welds in raw frames.)

I don't know how to weld.
I also know I don't know how to weld.
I know that you DON'T re-weld a CrMo bmx frame

seriously, fingernail polish.

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6/14/2015 6:18 PM

Thanks for the wisdom, may the force be with you.

Hey, we all freak out when we have things like a small scratch under the fork or somewhere.... I mean, when were not beauty freaks.

Thread starter, what did you do?

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It doesn't matter where a train goes. It's decidin' to get on that does.

6/15/2015 6:08 AM

Skylight wrote:

The tubing there is quite fat, and for cause. It is near to the bottom bracket, and that is a place where about 45% of the stress occurs. Your chunk thing looks fine for the moment, but it could develop small microscopic cracks that will take it's toll over time. An ultralight once blew off it's landing gear because of the same thing.

But here you enemy is corrosion: if rust gets in there and starts eating your frame, you can start looking at other frames.

The best thing to do would be to weld a small rectangular piece of metal on that, just long enough so that it transfers the stress from one end to another and skipping the hole.

Or, you could just paint over it, forget, and see how long it lasts.

Better still, forget about it and go ride.

CHeers.

I would avoid welding, it would add heat to the area, and WEAKEN around the weld.

I would just ride, and check on it once in a while.

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"Hey anybody ever make that mistake like right when you wake up in the morning and you believe in yourself?" -Kyle Kinane

"BIKES!" -Tom Segura

6/15/2015 6:12 AM

I just put some electrical tape around it so moisture won't get in and rust it. Ride it till it breaks i guess haha

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6/15/2015 7:24 AM

Skylight wrote:

The tubing there is quite fat, and for cause. It is near to the bottom bracket, and that is a place where about 45% of the stress occurs. Your chunk thing looks fine for the moment, but it could develop small microscopic cracks that will take it's toll over time. An ultralight once blew off it's landing gear because of the same thing.

But here you enemy is corrosion: if rust gets in there and starts eating your frame, you can start looking at other frames.

The best thing to do would be to weld a small rectangular piece of metal on that, just long enough so that it transfers the stress from one end to another and skipping the hole.

Or, you could just paint over it, forget, and see how long it lasts.

Better still, forget about it and go ride.

CHeers.

dave lawrence wrote:

I would avoid welding, it would add heat to the area, and WEAKEN around the weld.

I would just ride, and check on it once in a while.

Yeah man we got that.

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It doesn't matter where a train goes. It's decidin' to get on that does.

6/15/2015 7:54 AM

Nwewinit wrote:

The worst thing you could do to that is weld it... Right next to welds are the weakest points on any frame. It and mess up any type of post weld heat treating. Because welding heats up what wever your welding.... And the hot doesn't stay put, it kind of transferres througout whatever your blasting with the welding rod.

Ducttape over it=good
electrical tape=good
paint=good
fingernail polish=good

Weld=bad

Bubblegum over it=better then weld.
Doing nothing=better then the bubble gum.

Ride it till it breaks= what I'd do.

master_o_562 wrote:

You are correct about that. I actually do a lot of welding as a hobby and the only thing I would do to that is maybe lay the worlds smallest bead in there grind over it and call it a day. Another problem with people just welding their frames is its not steel its chromoly (like steel but stronger and lighter but harder to mig weld) . So like you said it would look like shit on a mig welder that is. If I was really going to ever weld my frame I would set up a tig welder with a very small tungsten electrode maybe 30-50 amps and play around with what polarity to run (DC-,DC+ etc)

I hope you would also use chromoly filler rods...

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"Hey anybody ever make that mistake like right when you wake up in the morning and you believe in yourself?" -Kyle Kinane

"BIKES!" -Tom Segura

6/15/2015 5:22 PM

I'm somewhat mind-blown that people actually suggest welding to fix that... It's a scratch, a deep one, but a scratch. I doubt it's going to compromise the strength THAT much.

If there was a small hole forming in the metal, then yeah there's cause for concern... But right now I wouldn't even worry about it.

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6/16/2015 6:16 AM

Yep, you kids are ridiculous. Look at how small that scratch is compared to the chain. Super small maybe the size of a half link of chain. I wouldn't be surprised if it was just caused by some chain slap during a grind.

Its a bicycle, its going to get beat up and scratched a bit. Don't worry about it.

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6/16/2015 6:52 AM

bmx is full of pussies these days.... this is my dropout...

Photo

trust me, your frame will be fine.

and rust? thats already inside your frame bro, its surface rust. the metal is that thick and surface rust takes that long to do ANYTHING that i VERY much doubt any harm will come from a bit of rust.

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6/16/2015 6:54 AM

sundaybmxRR wrote:

I'm somewhat mind-blown that people actually suggest welding to fix that... It's a scratch, a deep one, but a scratch. I doubt it's going to compromise the strength THAT much.

If there was a small hole forming in the metal, then yeah there's cause for concern... But right now I wouldn't even worry about it.

This. Just put something over it as far as the bare metal goes (paint, clearcoat of some sort, a sticker, whatever) to keep moisture off it if you are concerned. The amount of rust that would generate would take a couple YEARS to cause issues from typical riding. You would need to leave it in a small room with salt water for it to be an issue any faster than that.

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"Hey anybody ever make that mistake like right when you wake up in the morning and you believe in yourself?" -Kyle Kinane

"BIKES!" -Tom Segura