I have the RDs, and I'm happy. for everybody;s info, they are sold as road doubles and SS/FG cranks. They are all marked RD2. the right crank is marked rd2r. I'm running a road chainring though. If you do not want to limit yourself to track only chainrings, (yes, i know that this is kind of awkward phrasing, I'm referring to BCD) you may want to check out the RDs.