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Derailleur Hanger

Old 01-07-18, 03:52 AM
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DariusP3P
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Derailleur Hanger

Hey guys, I have an intergrated aluminium hanger and it's a 7005 aluminium frame. The hanger is bent noticeably, I was thinking of heating it with a blow-torch and putting it in a vice, is this doable?
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Old 01-07-18, 06:37 AM
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Well, you've whacked your hubs with a hammer, why not burn up your frame? Seriously, the heat will not be good but you have nothing to lose by trying to bend it. Use a derailleur hanger tool instead of a vise or search for the method that uses a wheel threaded into the hanger.
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Old 01-07-18, 07:26 AM
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shelby, I came here for advice, not criticism. I get it - I made a mistake!

Last edited by DariusP3P; 01-07-18 at 08:38 AM.
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Old 01-07-18, 07:38 AM
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Chill, friend You've got the advice you need....
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Old 01-07-18, 07:59 AM
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To Heat or Not to Heat

I have an aluminum framed bike and also bent my hanger. I made a tool like on the video below to use it as a 'straightener' and an alignment checker. Worked for me....

Please don't put a torch to that aluminum fame.

Oh, if your local Lowes or Homeless Depo does not have the 10mm x 1.0mm bolt go to the second link below and order one.


https://www.boltdepot.com/Metric_tap...m_x_1.0mm.aspx
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Old 01-07-18, 08:36 AM
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Originally Posted by shelbyfv View Post
Chill, friend You've got the advice you need....
My apologies, Thanks for the advice

Last edited by DariusP3P; 01-07-18 at 08:40 AM.
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Old 01-07-18, 08:38 AM
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Originally Posted by MePoocho View Post
I have an aluminum framed bike and also bent my hanger. I made a tool like on the video below to use it as a 'straightener' and an alignment checker. Worked for me....

Please don't put a torch to that aluminum fame.

Oh, if your local Lowes or Homeless Depo does not have the 10mm x 1.0mm bolt go to the second link below and order one.

https://www.youtube.com/watch?v=sWdO4dnu18g

https://www.boltdepot.com/Metric_tap...m_x_1.0mm.aspx
Thanks, the problem is that I have a feeling it will snap by using the alignment tool. This is a method the metal-working factory suggested. Any ideas?
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Old 01-07-18, 08:48 AM
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Originally Posted by DariusP3P View Post
Thanks, the problem is that I have a feeling it will snap by using the alignment tool. This is a method the metal-working factory suggested. Any ideas?
Heat to the point of softening the aluminum can either damage the adhesive (if this is a bonded frame) or compromise the heat treatment (if this is a welded frame). I'd rather not use heat; try to bend it back. If it cracks or breaks, cut off the remains and use a bolt-on claw to attach the derailleur.
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Old 01-07-18, 09:02 AM
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Originally Posted by JohnDThompson View Post
Heat to the point of softening the aluminum can either damage the adhesive (if this is a bonded frame) or compromise the heat treatment (if this is a welded frame). I'd rather not use heat; try to bend it back. If it cracks or breaks, cut off the remains and use a bolt-on claw to attach the derailleur.
Thanks, I know what 'bolt-on claw' you're talking about but do you mind posting a link to where I can buy one of these?

This would also require me to drill holes in the drive-side dropout, right?

I have also seen videos of people modifying their frames to accommodate replaceable hangers, would this be a better solution?

I will take your advice, but wouldn't cold setting it weaken it and increase the risk of it randomly snapping during a ride? Assuming it doesn't snap while I straighten it, that is.

Last edited by DariusP3P; 01-07-18 at 09:11 AM.
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Old 01-07-18, 09:10 AM
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Originally Posted by DariusP3P View Post
Thanks, I know what 'bolt-on claw' you're talking about but do you mind posting a link to where I can buy one of these?
Any decent bike shop ought to have them, either new or salvaged off a derelict derailleur. But you can buy them on-line:

https://harriscyclery.net/product/su...r-claw-963.htm

I will take your advice, but wouldn't cold setting it weaken it and increase the risk of it randomly snapping during a ride? Assuming it doesn't snap while I straighten it, that is.
Yes, but failure is not a certainty. How much risk are you willing to take?
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Old 01-07-18, 09:24 AM
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Originally Posted by JohnDThompson View Post
Any decent bike shop ought to have them, either new or salvaged off a derelict derailleur. But you can buy them on-line:

https://harriscyclery.net/product/su...r-claw-963.htm



Yes, but failure is not a certainty. How much risk are you willing to take?
Thanks for the link, I'd rather not have to worry about the frame itself, i'd rather have another piece break instead of the frame. Do you suggest I simply cut off the hanger and fit the adaptor?

Are there any compatibility issues with these adaptors?

Last edited by DariusP3P; 01-07-18 at 09:43 AM.
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Old 01-07-18, 09:54 AM
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I vote for just cold setting it with an alignment tool. I've had to do it twice over 20 years on my 7005 frame and it's still holding strong. Made me a little nervous since alu hangers don't need much force to bend back. Make sure your wheel is clamped in of course. You can always go the grind the dropout, add separate hanger route if it cracks.
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Old 01-07-18, 09:59 AM
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Thanks cranky, I'll give it a go when I have some time, if it breaks, it's on you . I'll get a claw adaptor like John suggested just in-case.
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Old 01-07-18, 10:19 AM
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Originally Posted by DariusP3P View Post
Thanks cranky, I'll give it a go when I have some time, if it breaks, it's on you . I'll get a claw adaptor like John suggested just in-case.
Ha, ha. OK but you must include a photo of the mutilated hanger if it fails.
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Old 01-07-18, 10:43 AM
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Originally Posted by JohnDThompson View Post
Any decent bike shop ought to have them, either new or salvaged off a derelict derailleur. But you can buy them on-line:

https://harriscyclery.net/product/su...r-claw-963.htm



Yes, but failure is not a certainty. How much risk are you willing to take?

How can I be sure this can fit my frame? or is it universal?

Last edited by DariusP3P; 01-07-18 at 10:55 AM.
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Old 01-07-18, 11:26 AM
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Originally Posted by DariusP3P View Post
How can I be sure this can fit my frame? or is it universal?
The Harris link shows a claw that will work with a horizontal dropout. It won't work with a vertical dropout.

Here are links to 2 emergency universal hangers that will work with both dropouts.

https://problemsolversbike.com/produ...versal_-_21655

Wheels Manufacturing Emergency Hanger

The wheels mfg hanger should work with the solid axle. The problem solvers won't.

I've used the problem solvers version wrenching rides. It meant being able to finish the ride. N.B. the emergency hanger will displace the derailleur further away from the cluster. Some derailleurs may not work with the biggest cogs.

These will get you through until you figure out a way to attach a permanent hanger to your frame.
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Old 01-07-18, 11:38 AM
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Often now, RD hangers , are replaceable (not part welded into the frame) .. But there are literally hundreds of different designs..

getting a Spare will be .. prudent.
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Old 01-07-18, 11:46 AM
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I have a semi-vertical dropout. I think I may have to modify it to accommodate a removable derailleur hanger.
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Old 01-09-18, 01:31 PM
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Originally Posted by Crankycrank View Post
Ha, ha. OK but you must include a photo of the mutilated hanger if it fails.
Hello, bent it back using a vice, just need to weld some material in to re-tap the threads. Seems solid.
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Old 01-09-18, 01:50 PM
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indexed shifting? it needs a more accurate hanger alignment than just 'bending it back'..

there are steel repair pieces that fit in from the back, through the formerly threaded dropout rounded out with a tapered reamer..

there after you need to hold the insert with a wrench, on the back side , while you screw in the derailleur mounting bolt..






...

Last edited by fietsbob; 01-09-18 at 01:55 PM.
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Old 01-09-18, 06:09 PM
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Originally Posted by fietsbob View Post
indexed shifting? it needs a more accurate hanger alignment than just 'bending it back..
+1. You still need to use and alignment tool to make it parallel to the wheel.
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Old 01-09-18, 08:27 PM
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Originally Posted by fietsbob View Post
indexed shifting? it needs a more accurate hanger alignment than just 'bending it back'..

there are steel repair pieces that fit in from the back, through the formerly threaded dropout rounded out with a tapered reamer..

there after you need to hold the insert with a wrench, on the back side , while you screw in the derailleur mounting bolt.
...
Wire Thread Inserts | Screw Thread Inserts | Stanley Engineered Fastening

Helicoil? Also found at Auto parts stores
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Old 01-10-18, 12:20 PM
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Thanks - Used a 'Dropout Saver'
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Old 01-13-18, 05:14 PM
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I made one of these recently, great tool, tweaked all four of my bikes and made them all shift better. I would recommend getting an 80mm long screw if you can find it, helps with clearance on skewer


Originally Posted by MePoocho View Post
I have an aluminum framed bike and also bent my hanger. I made a tool like on the video below to use it as a 'straightener' and an alignment checker. Worked for me....

Please don't put a torch to that aluminum fame.

Oh, if your local Lowes or Homeless Depo does not have the 10mm x 1.0mm bolt go to the second link below and order one.

https://www.youtube.com/watch?v=sWdO4dnu18g

https://www.boltdepot.com/Metric_tap...m_x_1.0mm.aspx
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