Post crash repair

[Kcyclist]

Hi all, went down at weekend on right side of bike. Rear derailleur and hanger bent.
Can they be bent back or us it best to replace? Is this a DIY or bike shop

 

[Bonefish Blues]

Replace, without question. Hangers are designed to bend so your frame doesn't.

 

[Kcyclist]

So replace derailleur and hanger ? It's tiagra 10 speed. Any specific hanger which is best? Thanks 👍

 

[vickster]

So replace derailleur and hanger ? It's tiagra 10 speed. Any specific hanger which is best? Thanks 👍

One that fits your frame
Is the derailleur actually broken?

 

[Cycleops]

I had a similar incident last week and I thought the derailleur itself was also bent but was only the hanger.
If you try to bend it back it'll probably snap.

It'll need to be the exact same hanger. SJS have a good selection:
https://www.sjscycles.co.uk/search/?term=derailleur+hangers

 

[fossyant]

What bike is it. Possibly try BETD for a hanger.

Can't tell from that picture of the mech though. Might be OK.

 

[Kcyclist]

One that fits your frame
Is the derailleur actually broken?

 

[Kcyclist]

Thanks all
I have ordered the hanger which fits the frame ! And replacement derailleur.
Back out on bike soon hopefully!

 

[Chislenko]

Would you actually replace or just bend back into shape, I have in the past with no problems.

Let's face it when you use one of the bespoke hanger alignment tools they exert a fair bit of force on the hanger so they must be designed with some strength in mind.

I came across a woman recently who had fell off and bent her hanger into the wheel, straightened it by hand and eye and she cycled off with all gears back working happy as Larry, whoever Larry is!

 

[MichaelW2]

Would you actually replace or just bend back into shape, I have in the past with no problems.

Let's face it when you use one of the bespoke hanger alignment tools they exert a fair bit of force on the hanger so they must be designed with some strength in mind.

Mainly used for integral steel hangers. Alu ones will break ( as designed) if you bend them too many times or too hard. Integral aluminium hangers are a design flaw.

 

[si_c]

For that hanger definitely replace - the derailleur may well be OK though - worth checking before you replace it.

 

[T4tomo]

Would you actually replace or just bend back into shape, I have in the past with no problems.

If you don't have a alignment tool, then a new hanger is the cheaper and safer option.

I have had one straightened in the past but it wasn't far out of wonk, Frame maker had no idea what hanger was on it, and certainly no spares kicking around.

 

[raleighnut]

If you don't have a alignment tool, then a new hanger is the cheaper and safer option.

I have had one straightened in the past but it wasn't far out of wonk, Frame maker had no idea what hanger was on it, and certainly no spares kicking around.

Even a new hanger needs aligning

 

[T4tomo]

Even a new hanger needs aligning

the vast majority you can simply attach and they will be within such a tolerance that you can index your derailleur with no issue at all.

 

[Bonefish Blues]

Even a new hanger needs aligning

Good video here

View: https://youtu.be/pxkE4F5nKTE