Originally Posted by
MDcatV
there is a cyclingnews review of sram force 2010 that concluded red was no functional improvement over force except for weight savings.
Hollow cassette, ceramic pulleys, ceramic BB, ZL shifting for the rear. Diminishing returns but returns nonetheless.
By cyclingnews' logic, there would also also not be any functional improvement of 7900 over 6700 besides weight savings.