Since I already ordered the KMC I will try that, If that doesn't seem to work well I will go with the ultregra. The reason I am leaning toward the KMC is because the shop told me when they were building the bike from the parts I had that the shifting might be a problem with the 105 5600 chain. It didn't give any problems at all till abot 300 miles of use then started double shifting one in a while. The cassette is a durace 7800 but all tyhe parts are 10spd. To me is seems like a chain width issue but I haven't enough road experience with 10spds to know yet. Being here in florida where its mostly flat and I run in the big ring all the time I can see where 11 spds would be nice.