I see that Evans Cycles are doing group sets at a big discount, and have the Ultegra 6800 for what seems a very reasonable price (not sure if it's forum etiquette to say how much!) I have a Domane 4.3 with 'came in the box' Bontrager aluminium wheels. I think everything should fit ok, but the cassette I believe is 11 speed and my current one is the Tiagra 10 speed. Will I be able to fit the 11 speed onto my existing wheels or will I need to upgrade those at the same time? And for a bonus question, will the chainset fit into the existing BB90 bottom bracket, or will I need something else to support it?