I just bought a 2007 SRAM Rival group minus cranks and BB for my Flyte frame. I know about spacing issues with rear cassettes and chain width, etc. What I'm fuzzy on is how 8, 9, 10spd chains work with randomly selected chainrings. Are the rings different widths? Am I likely to have problems from randomly picking out a good deal on a compact double off of ebay?
This is my first build and I'm also fairly new to cycling, so I really don't know and would appreciate a little guidance.