Originally Posted by
CraigB
I think Rival is intended to slot into the SRAM lineup at the same relative point Ultegra is in Shimano's. The entry level SRAM stuff is, I think, Apex.
From what I've pieced together, there is no one-to-one correspondence between the gruppos. They kind of slot in between each other. It goes something like this, from "better, higher" quality to lesser.
Red
Dura Ace
Force
Ultegra
Rival
105
Apex
Tiagra
etc.