Angle between chainring and deraileur too big... Why?

[InspireTheEmpathic]

I had an accident with my bike a while back where my chain snapped and ripped the rear deraileur off with it!
I bought a new hanger, deraileur and chain, both are the most recent shimano 105 models.
My previous deraileur was the 105 model before this but basically identical, both are ten speed etc.

I've just fitted the new chain and deraileur to find out that the angle between the rear deraileur lower jockey wheel and my freewheel

is causing the chain to become misaligned with the deraileurs lower jockey wheel...

WHY?!!!
It's basically identical to my old one and I have never in all my years of cycling come across an issue with the rear deraileur like this!
In lower gears where the angle of the chain is lessened the deraileur performs perfectly...
here's a picture when the bike is on the largest chainring and the smallest sprocket.

And some other random stuff

 

[InspireTheEmpathic]

Apologies for the Screen stealing high res :/

 

[T.M.H.N.E.T]

Big ring big sprocket does not mix.

 

[User6179]

You possibly bent the frame where the hanger attaches .

 

[Smurfy]

You possibly bent the frame where the hanger attaches .

+1 The last picture suggests the hanger is bent.

 

[InspireTheEmpathic]

Thanks for all the quick replies everyone! I would go with bent frame too then... the hanger is brand new and straight so it must be the frame. What should I do now then? The frame is made of 7006 Aluminium... can it be bent back? can I do it? how much would it cost to fix it if I can't do it myself?
I literally do not know what I would do if the frames a goner, I could never afford to replace it.

 

[uclown2002]

Lbs time for proper advice I suggest.

 

[Smurfy]

When everything is straight and true and the bike is upright, the sprockets on the cassette and the rear derailleur cage should both be vertical (parallel with each other), otherwise the chain runs at an angle between the top jockey wheel and the sprocket. I'd be surprised if the frame is bent, as I think the hanger is supposed to be weaker (to save the frame), and that's why it's replaceable.

 

[Smurfy]

I suppose it could be the other way around. Maybe the wheel spindle is not properly seated in the dropouts.

 

[Rohloff_Brompton_Rider]

Get a pair of big adjustable spanners and close the jaw on the mech hanger and straighten the angle. Obviously remove the mech first, as it's alloy you'll have to be very slow and gentle and try not to over work the metal, alloy can work harden and crack/break.

It takes a bit of time, unless you've gotten professional tools of course, I.e., bend it a bit put the mech on check it, if it's not right remove mech and bend a bit more etc etc.

Edit: after having another look at your photos it looks to be out of alignment in both vertical and horizontal plains, so you'll need to straighten it in both.

 

[User6179]

Provided the mech and hanger is seated correctly I would just grab the body of the mech and twist It so the mech is aimed at the chain ring then adjust the gears again.

 

[Roadrider48]

Get a pair of big adjustable spanners and close the jaw on the mech hanger and straighten the angle. Obviously remove the mech first, as it's alloy you'll have to be very slow and gentle and try not to over work the metal, alloy can work harden and crack/break.

It takes a bit of time, unless you've gotten professional tools of course, I.e., bend it a bit put the mech on check it, if it's not right remove mech and bend a bit more etc etc.

Edit: after having another look at your photos it looks to be out of alignment in both vertical and horizontal plains, so you'll need to straighten it in both.

That's what I did after an accident some time ago. It turned out perfect in the end. You're dead right though....slowly, slowly.

 

[InspireTheEmpathic]

Get a pair of big adjustable spanners and close the jaw on the mech hanger and straighten the angle. Obviously remove the mech first, as it's alloy you'll have to be very slow and gentle and try not to over work the metal, alloy can work harden and crack/break.

It takes a bit of time, unless you've gotten professional tools of course, I.e., bend it a bit put the mech on check it, if it's not right remove mech and bend a bit more etc etc.

Edit: after having another look at your photos it looks to be out of alignment in both vertical and horizontal plains, so you'll need to straighten it in both.

Thank you very much! I have removed the hanger and held straight edges on both the frame and hanger, the dropout is slightly angled inwards towards the back of the frame, about half a mm, and the new hanger follows the same pattern! Hangers cost a bloody fortune for what they are and I had to get an aftermarket one to avoid importing one from California. I'll have a go edging the hanger back out to compensate for the frame like you said. Thank god for molegrips!

Provided the mech and hanger is seated correctly I would just grab the body of the mech and twist It so the mech is aimed at the chain ring then adjust the gears again.

No way am I bending things with my brand new mech! I'll just use molegrips and a soft touch :P

I'll report back with my results if there are any of you that are really that interested!

 

[Rohloff_Brompton_Rider]

When I did mine I used Sheldon's bit of string method, cheap and works just fine. Tbh though I reckon the rack'th eye method would be fine, I.e., bend down and line up the large chain ring with the mech by eye.

 

[InspireTheEmpathic]

Reporting back... Everything seems to be running fine! I still need to tune the gears but the jockey wheel seems aligned now and everything is good! if it's not I know I can bend the hanger now so all is well!
Words cannot describe how much losing my bike would have affected me, It's more than just my only mode of transport it's the nicest thng I own and I love the thing! Things haven't been going so well lately and this would have been the straw that broke the camels back so to speak!
Thank you all so much for the advice! It would have been a very sleepless night without you!

See you on the roads tomorrow! And thank you so so so very much again!

When I did mine I used Sheldon's bit of string method, cheap and works just fine. Tbh though I reckon the rack'th eye method would be fine, I.e., bend down and line up the large chain ring with the mech by eye.

P.S. What is sheldon's bit of string method?