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This summer I changed to a 7950 from a 7900 crank. My old 7900 chain always gave me a little bit of noise in the 3 largest cogs. I just put on a new 7900 chain and everything is silent now.

As an FYI...make sure that your jockey pulleys are squeeky clean on the RD...dirty ones make for a noisy rear.
 
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