On Mar 13, 2013, at 10:22 AM, Garth wrote:

That may be part of it, as well as "monkey see problem in another, monkey start to have problem". The springs in modern derailers are weak compared to those from even the 7,8 speed ones. I have a Shimano LX rear 9sp. that flops the chain all over the place with bumps, but an XT 8 speed and older Shimano from the 80's do not.


Yep. Those of us who suffered through the "bassworms" and other return spring tension solutions in trying to use SRAM mtb shifters with Shimano rear derailleurs know that the later seriously lightened the spring tension throughout their designs in the 90's.
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