To be on the safe side, what length 10 speed chain should i get with an 11 speed 50/34 crankset and a 10 speed 11/34T cassette? I am hoping to do without a roadlink, but i am not positive about this yet. Should i wait until after i have tested this set up determining whether or not i need the roadlink before i buy the chain? I understand diferent set ups need different length chains. FWIW, i am using an Ultegra 6700 RD.