My race bike is completly shimano 105 except for my chain and cassette. I use a combo of SRAM and Ultegra cassettes. In the past I have always used SRAM chains, usually the 950. However, I just got an Ultegra chain dirt cheap. I am wondering if it is possible to use a SRAM powerling on a shimano chain? I just dont want to mess with carrying around a spare chain pin. What do you guys do? Thanks!