It maybe worth your while taking a look at this article .. it's mainly discussing new Red but they test various combinations of old and new Red and also Dura Ace front mech with Red ..
http://velonews.competitor.com/2012/03/news/it-works-we-test-sram-red-backwards-compatibility_209270
@Oswald started
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It maybe worth your while taking a look at this article .. it's mainly discussing new Red but they test various combinations of old and new Red and also Dura Ace front mech with Red ..
http://velonews.competitor.com/2012/03/news/it-works-we-test-sram-red-backwards-compatibility_209270