I'm building my first bicycle and kind of learning as I go. Everything's assembled and now I just want to adjust the shifting so that everything's smooth. Problem is when the front and back derailleurs are both in the smallest gear, the chain's rubbing against the side of the largest chainring. I have a SRAM Rival double 10 speed crankset, Ultegra derailleur, Shimano 9-speed cassette, and Tiagra derailleur. Could this be a crankset/cassete/other compatibility issue or do I just need to keep playing with the derailleur?
Thanks for the help.