Floppy Derailleur Syndrome

[yakboy]

Just finishing off the Scott Endorphin

Thread 'Thermoplasticfantastic Scott Endorphin 1997'

Feb 28, 2021

As you know I am a sucker for a Scott (especially an E-Stay) and a sucker for a basket case......Well the stars have perfectly aligned.

It's not cracked!(surprisingly!) But the paint is shocking and is going to need a complete strip down (Just the way I like them)

I will probably stick with black but was thinking of investigating hydro dipping.

Component wise I have always wanted to do a flouro yellow theme and I think this may be my opportunity.

• yakboy
• Replies: 72
• Forum: Reader's MTBs --> 1997

• 

And unfortunately in the words of Wallace, "The bounce has gone out of his Bungee" on the Sram 9.0SL rear derailleur. Before I try and take in apart, has anybody got and experience of tightening springs in Sram ESP derailleurs?

 

[yakboy]

Ok, with the lack of responses I thought I'd better investigate...so derailleur off.



It was immediately obvious that the stop on the cage was broken so all the spring tension had been lost.
I had a very lightly used 5.p esp mech that I bought new in the 90's when I built up my wife's first mountain bike but she hated Gripshift so it was taken off pretty sharpish.



Comparing the two cages they were identical in size but the 5.0 was steel not alloy ( heavier but stronger)



So I disassembled both and tried to reassemble and re-tension the spring...now there must be a trick to doing this as despite super-glueing the spring end into the cage it slios out when trying to rotate the cage around ( it has to be lifted up a little for the stop to clear the derailleur body). I spent an hour, swore loads and no joy...any tips anybody?

 

[ishaw]

I've not done an SRAM but on older Shimano before they added a removable stop on the plate (no idea of they still do this), there is a back that I don't have until I do, sometimes takes minutes, sometimes much much longer.

I seem to recall getting it all aligned at an angle and a twist and push motion. Feels like you need 3 hands.

 

[yakboy]

I've not done an SRAM but on older Shimano before they added a removable stop on the plate (no idea of they still do this), there is a back that I don't have until I do, sometimes takes minutes, sometimes much much longer.

I seem to recall getting it all aligned at an angle and a twist and push motion. Feels like you need 3 hands.

Yep it's a right PITA. I am going to try and glue the spring end with JB weld and see if that holds it in while I twist as superglue and hot glue have not been secure enough

 

[novocaine]

grab both ends of the spring and pull them to make the spring a few mm longer.

 

[yakboy]

grab both ends of the spring and pull them to make the spring a few mm longer.

Great minds think alike...already tried it, doesn't work!!

 

[Woz]

Contact NASA to loan out a gravity free space?

I'm not familiar with type of mech, but I wouldn't mess with JB weld there.

You could try having the cage flat between two pieces of wood, and then turn the mech body and slamming it down after the stop - at least gravity is working for you in that position.

Or you could try that and / or a couple of plastic wedges rammed suitably in the spring. When the spring is engaged after the stop, slowly slide the wedges out ramming the mech body down.




Stock up on plasters too

 

[yakboy]

Contact NASA to loan out a gravity free space?

I'm not familiar with type of mech, but I wouldn't mess with JB weld there.

You could try having the cage flat between two pieces of wood, and then turn the mech body and slamming it down after the stop - at least gravity is working for you in that position.

Or you could try that and / or a couple of plastic wedges rammed suitably in the spring. When the spring is engaged after the stop, slowly slide the wedges out ramming the cage down.

View attachment 961914


Stock up on plasters too

The JB weld is going to be applied very sparingly just to hold in the spring end (I'll apply it with some of my dental instruments, so will be accurate). Having it mounted in wood on a vice and keeping downward pressure is a good idea though. Will have a go this weekend when I am in a calm mood!!

 

[Woz]

The JB weld is going to be applied very sparingly just to hold in the spring end (I'll apply it with some of my dental instruments, so will be accurate). Having it mounted in wood on a vice and keeping downward pressure is a good idea though. Will have a go this weekend when I am in a calm mood!!

Yes. You could potentially temporally screw the cage down to some wood and put that in the bench vice for the third hand.

I'm reasonably sure one or two plastic wedges in the spring would work well. Once the spring is engaged a zip tie can help keep it altogether while you faff screwing it all back together.