Now there is some good info. I was indeed using a brand new KMC X10SL chain. I would use the Sram chain, but I'm running Praxis chainrings and they recommend against using a Sram chain. So my casette wants a Sram chain and my chainrings want a KMC chain. Oi!

Given that the 2011 RD runs fine with the KMC chain, what would cause this on the new RD? Is it the new pulleys?

I recently installed 2012 Red on my bike. Using a slightly used KMC X10SL chain, the rear indexes correctly. I don't think its the chain.

i wonder what is the reason for parxis recomending against sram chains. i has a similar problem with my 2010 red rd with a yaban chain, but swapped to a dura ace 7900 and things became butter smooth.

my red set up was awful with a YBN chain ...its 2011 but with KMC its spot on

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stefanpearce@rocketmail.com