Originally Posted by
oldbobcat
Having worked on SRAM equipped bikes with Apex through Force, I'm sure they are completely cross compatible. Shifters all behave the same, they are all 2x10 configurations, and they're fully compatible with the same SRAM and Shimano 10-speed chains. I'm not sure about Red, mainly regarding the behavior of the front derailleur. I believe you need to use Red levers with the Red FD. The RD is no problem, though. In last year's Giro D'Italia the teams on SRAM were using Apex long-cage RDs on bikes that were otherwise Red. And I have a buddy who's on a Rival equipped Wilier, except for the Force crankset.
+1 to all of this, and a little bit more of info.
You can use the new yaw FD without the new red levers. No personally experience (yet), but this article says so.
http://velonews.competitor.com/2012/...ibility_209270
I'm probably going to get a new red FD for my 2013 Force equipped bike.