Originally Posted by
ImRael
In the grand scheme of things, you probably will not notice any difference between 105 and Ultegra.
Agreed! If I can add my recent experience. I had a Fuji Roubaix Pro, 2005 version I think. They do mix components. So full Ultegra is doubtful, as confirmed above. In Jan I decided to change my frameset, slight crack. Went for (and I know it's not a CAAD 9) a Cannondale Six 13. You will struggle to confince me to ride anything else.
Ever. Frame makes a huge difference.