I just got a new Roubaix Sram Compact, but am concerned that I may need a triple. I have a triple on my tandem for our very hilly region. I rode the Roubaix twice this weekend and am getting use to it. The cassette is 11/28 and the chainrings are 50/34. My low triple is 29 with a 34 rear cog. How expensive is it to change the compact to a triple?? I would prefer SRAM if I could. Thanks! Counselguy
