Originally Posted by
Giacomo 1
If what I read in my search was true, it looks that the 105 has the same interior components as the Dura and Ultegra, but not the bling factor on the outside.
not quite true, there is a trickle down effect but 105 lags a few years behind DA/Ultegra. This can often be seen with the difference in hood shape between DA and 105. DA also has ti parts, and more exactingly machined bits.