105 is durable enough...and functions just fine! sure, ultegra is lighter...but you don't need to shave a few grams unless you're going to race. some people say ultegra is smoother than 105...i can't feel a great deal of difference...and besides, some people prefer SRAM and Campy, which are much more chunky/louder/organic than shimano components...so "smoothness" means nothing aside from personal preference...
go with the 105 unless you have the extra cash and feel like treating yourself to a luxury!![]()




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