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

[Rohloff_Brompton_Rider]

An adapted method of this....

http://sheldonbrown.com/frame-spacing.html

Tie the string to the frame pull taught and across the front and back of the chain ring then to cassette then the pulleys of the rear mech.
If everything is nice and square all point will touch the string.

 

[Smurfy]

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

It's for checking frame alignment. It's primarily for steel frames, which can cope with quite a bit of cold work. Use at your own risk on aluminium frames (I wouldn't).
http://sheldonbrown.com/frame-spacing.html#symmetry

 

[User6179]

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!



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!

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!


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

Stop faffing about and get the hammer out

 

[mcshroom]

Looks like you're sorted, but my method of straightening the hanger (after bending a steel frame with in-built hanger) was to put the old dead mech back on, stick a 5mm hex-key in the hole and use that to bend the hanger back into alignment.

 

[InspireTheEmpathic]

Looks like you're sorted, but my method of straightening the hanger (after bending a steel frame with in-built hanger) was to put the old dead mech back on, stick a 5mm hex-key in the hole and use that to bend the hanger back into alignment.

I actually ended up bending the new hanger using that method, I worked out that an allen key didn't actually damage the thread inside where the mech is attached, I put the hex key in there, very little effort and it was back in shape!

 

[InspireTheEmpathic]

And for the record too, that shitty crank set is going in the bin asap!