SRAM XX Front Derailleur Shifting Issues

[philip.maree]

I have a XX Front Derailleur with an XX Crank. I used to run 2x9 and everything was fine but since I converted to 2x10 the front shifting is just horrible.

 

I only shifts up sometime and won't shift under load. I have tweaked everything that I can think of tweaking. Limit screws, cable tension, new chain, chainline.

 

Could it be one of the following?

 

1. The pickups on the chainrings are worn and should be replaced?

2. The tension spring in the X.0 RD is to slack, can I adjust this?

 

Any advice/suggestions would be helpful. I am doing Sani2C next week and don't want to struggle with shifting.

[ichnusa]

Firstly, check the position of the derailleur. The outer arm of the cage should be just a couple of millimeters above the large chainring when above it and it should be parallel to the chainset when looking from the front or above. Then you can start tinkering with the cable tension and limit screws...

[philip.maree]

I have replaced the large chainring as it seems that the pickups were worn down. But even with a new large chainring and the checking of the position and alignment of the derailleur, the shifting in the front is still not great.

 

Is there any truth to the fact that the tension in some 10sp Rear Derailleurs are not enough and that SRAM will replace the derailleur in that regard?

 

Has anyone experienced trouble with shifting in the front?

[Edgar]

I have replaced the large chainring as it seems that the pickups were worn down. But even with a new large chainring and the checking of the position and alignment of the derailleur, the shifting in the front is still not great.

 

Is there any truth to the fact that the tension in some 10sp Rear Derailleurs are not enough and that SRAM will replace the derailleur in that regard?

 

Has anyone experienced trouble with shifting in the front?

 

I'm not a techie but I can't see how the RD change would effect the FD. I have seen guys having problems on the XX FD, generally they where not running std blades, and had put a bigger or smaller chainring on. when they went back to a more conventional combo it is was fine.

 

Not much help.

[dirtrider]

This is the second person that complians about 2x10 SRAM front shifting problems . Spoke to a chap at S2C and he had the same problems with no fix !

[philip.maree]

I'm not a techie but I can't see how the RD change would effect the FD. I have seen guys having problems on the XX FD, generally they where not running std blades, and had put a bigger or smaller chainring on. when they went back to a more conventional combo it is was fine.

 

Not much help.

To my knowledge the RD assist in the chain tension. If the spring in the RD is not stiff enough then the chain will be slack and will hamper shifting. The old 9sp X.0 RD's could be opened and the spring tension adjusted. The new ones don't work like that.

 

I am running a standard XX blade 26t 39t combo.

[AndreZA]

I can not see how RD does anything for the tension of the chain on the top. But I can be wrong, I just don't see how the RD can tension the chain when it contact points are the cassette and chainring.

[philip.maree]

I can not see how RD does anything for the tension of the chain on the top. But I can be wrong, I just don't see how the RD can tension the chain when it contact points are the cassette and chainring.

Not sure, I have googled and that was the majority of responses to this issue on the forums.

 

All I know is that I am struggling with shifting in the front. The FD is 100%, the large chainring is new. I just don't know anymore?

[AndreZA]

Do you have enough "throw" of the chain. It's is very easy to set the limiter to far in and this gives crappy shifting. Make sure the FD cage actually moves the chain all the way over the chainring instead of relying on the shifting pins to take it over.

[philip.maree]

Do you have enough "throw" of the chain. It's is very easy to set the limiter to far in and this gives crappy shifting. Make sure the FD cage actually moves the chain all the way over the chainring instead of relying on the shifting pins to take it over.

Will give that a double check. When I adjust the limit screw so that the cage shifts further over, the chain actually shifts to far.

[Fitter]

Interestingly we have been able to sort out XX FD shifting issues similar to what you describe by using Dura Ace chains.