I was reading a review of the SRAM Rival in Bicycling and my interest was definitely piqued. I currently have 105/Ultegra (rear deraileur and cassette only) but had been contemplating upgrading to Ultegra SL at some point. SRAM Rival is cheaper and about the same weight. Not that I really care about weight. I don't really know why I want to change my drivetrain so don't ask.

I thought I read you can run the SRAM mountain cassettes on their road drivetrains, this would be a major advantage so I could have a climbing cassette for trips to the mountains or hill country. Anyone know if that is true? Anyone a fan of the SRAM drivetrains? I probably won't upgrade for some time since it is about $900-1000 without the labor but it is a thought now.