Originally Posted by
IcySmooth52
You must have Red derailleurs if you have Red shifters. Red isn't compatible with any other group set because it uses a different cable-pull/derailleur movement ratio. Force is actually exactly the same as all other SRAM groupsets but Red in mechanical design. It's just nicer because of weight and materials used.
This is information directly from a SRAM rep.
Untrue.
You likely misunderstood the rep. He was likely saying Sram shifter will not work with components from other manufacturers.